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2012 Vol. 32, No. 08
Published: 2012-08-01

 
       光谱学与光谱分析
2017 The Influence of Laser Induced Damage Points on Characters of the Laser Transmission
WANG Fang-ning1,2, DUAN Tao3, NIU Rui-hua4, ZHANG Jian-wei4, WANG Qiong-hua1*
DOI: 10.3964/j.issn.1000-0593(2012)08-2017-05
The production and increase of damage points in optical components under high energy repetitive pulsed lasers is closely dependent on the effects of light beam intensity modulation. In the present paper, the appearance of laser-induced damage points on surface of K9 glass was observed. The damage is increased toward center. In this way, the center of the focus of laser beam is fully cracked, and the shell-like factures and the refractive-index changing region, which is caused by phase transition, are arranged outward orderly. The transmittance spectrum through the K9 glass and damage point were measured, indicating that the optical transmittances can reduce by over 20% and the declining rate is related to the area of damage points instead of the wavelength, which means that the full fracture of the material will absorb laser energy completely and is similar to the black body. The laser density detection with CCD shows that the damage points can cause the distortion of laser transmission and the scattering effect plays a major role. This kind of modulation effects by damage points can cause inhomogeneity of the laser light intensity distribution, which can induce diffusion of damage in optical components.
2012 Vol. 32 (08): 2017-2021 [Abstract] ( 1885 ) PDF (1860 KB)  ( 895 )
2022 Research on Cells Ablation Characters by Laser Plasma
HAN Jing-hua1, ZHANG Xin-gang2, CAI Xiao-tang3, DUAN Tao4, FENG Guo-ying1*, YANG Li-ming5, ZHANG Ya-jun1, WANG Shao-peng1, LI Shi-wen1
DOI: 10.3964/j.issn.1000-0593(2012)08-2022-05
The study on the mechanism of laser ablated cells is of importance to laser surgery and killing harmful cells. Three radiation modes were researched on the ablation characteristics of onion epidermal cells under: laser direct irradiation, focused irradiation and the laser plasma radiation. Based on the thermodynamic properties of the laser irradiation, the cell temperature rise and phase change have been analyzed. The experiments show that the cells damage under direct irradiation is not obvious at all, but the focused irradiation can cause cells to split and moisture removal. The removal shape is circular with larger area and rough fracture edges. The theoretical analysis found out that the laser plasma effects play a key role in the laser ablation. The thermal effects, radiation ionization and shock waves can increase the deposition of laser pulses energy and impact peeling of the cells, which will greatly increase the scope and efficiency of cell killing and is suitable for the cell destruction.
2012 Vol. 32 (08): 2022-2026 [Abstract] ( 1438 ) PDF (2188 KB)  ( 527 )
2027 Study of Cuttings Identification Using Laser-Induced Breakdown Spectroscopy
TIAN Ye1, WANG Zhen-nan1, HOU Hua-ming1, ZHAI Xiao-wei2, CI Xing-hua2, ZHENG Rong-er1*
DOI: 10.3964/j.issn.1000-0593(2012)08-2027-05
Cutting identification is one of the most important links in the course of cutting logging which is very significant in the process of oil drilling. In the present paper, LIBS was used for identification of four kinds of cutting samples coming from logging field, and then multivariate analysis was used in data processing. The whole spectra model and the feature model were built for cuttings identification using PLS-DA method. The accuracy of the whole spectra model was 88.3%, a little more than the feature model with an accuracy of 86.7%. While in the aspect of data size, the variables were decreased from 24041 to 27 by feature extraction, which increased the efficiency of data processing observably. The obtained results demonstrate that LIBS combined with chemometrics method could be developed as a rapid and valid approach to cutting identification and has great potential to be used in logging field.
2012 Vol. 32 (08): 2027-2031 [Abstract] ( 1514 ) PDF (1870 KB)  ( 518 )
2032 Research on Demodulation System for Human Body Temperature Measurement of Intelligent Clothing Based on Arrayed Waveguide Grating
YU Xiao-gang1, MIAO Chang-yun1, LI Hong-qiang1*, LI En-bang1, 2, LIU Zhi-hui1, WEI Ke-jia1
DOI: 10.3964/j.issn.1000-0593(2012)08-2032-05
A system for demodulating distributed fiber Bragg grating sensors of the intelligent clothing was researched and realized, which is based on arrayed waveguide grating. The principle of demodulation method based on arrayed waveguide grating was analyzed, intensity-demodulating method was used to interrogate the wavelength of the fiber Bragg grating based on the building up of an experimental platform, and demodulation experiment of pre and post series of fiber Bragg grating was completed. The results show that the wavelength demodulation of the system has high linearity for fiber Bragg grating, the system gives a wavelength accuracy of 0.001 nm, and demodulation error caused by crosstalk between different sensors is 0.000 5 nm. The measurement error of human body temperature is ±0.16 ℃. It can be applied to the human body temperature measurement.
2012 Vol. 32 (08): 2032-2036 [Abstract] ( 529 ) PDF (2187 KB)  ( 869 )
2037 Variation of Irradiance in the Arctic Pole during the Summer
TAO An-qi1, KE Chang-qing1*, XIE Hong-jie2, SUN Bo3
DOI: 10.3964/j.issn.1000-0593(2012)08-2037-06
The variation of irradiance affect the melting rate of the sea ice in the arctic pole,and the research on it is an important component of the global climate change research. The present research was based on the spectrum data collected during the 4th scientific research on the arctic of China in 2010, analyzed the variation of irradiance in the arctic pole during the summer and discussed the reasons for the change. This research shows that many factors lead to the change, among which the weather and the solar elevation angle affect the irradiance directly. The weather factors determine the amount of solar radiation that reached the ground after the absorption and attenuation of the clouds; In high-latitude areas, there is a low solar elevation angle and the attenuation of solar radiation was obvious. Our research shows that the spectrum at shorter wavelength is more sensitive to the changes in altitude of the sun, while the impact of weather on the irradiance increases with wavelength. Moreover, moisture content in the atmosphere also affects the solar radiation reaching the ground and the its impact is in a particular band but not for the entire spectrum range.
2012 Vol. 32 (08): 2037-2042 [Abstract] ( 1798 ) PDF (2310 KB)  ( 488 )
2043 Impact Analysis of Atmospheric State for Target Detection in Hyperspectral Radiance Image
ZHANG Bing1, SHA Jian-jun1,2, WANG Xiang-wei1, GAO Lian-ru1
DOI: TP722
Target detection based on hyperspectral radiance images can improve data processing efficiency to meet the requirements of real-time processing. However, the spectral radiance acquired by the remote sensor will be affected by the atmosphere. In the present paper, hyperspectral imaging process is simulated to analyze the effects of the changes in atmospheric state on target detection in hyperspectral radiance image. The results show that hyperspectral radiance image can be directly used for target detection, different atmospheric states have little impacts on the RXD detection, whereas the MF detection is dependent on the accuracy of the input spectrum, and good results can only be obtained by the MF detector when the atmospheric states are similar between the radiance spectrum of the target to be detected and the simulated hyperspectral image.
2012 Vol. 32 (08): 2043-2049 [Abstract] ( 2045 ) PDF (2789 KB)  ( 843 )
2050 The Solution of Nonlinear Function of Ion Mobility Based on FAIMS Spectrum Peak Position
WANG Dian-ling1, 2, CHEN Chi-lai1*, ZHAO Cong1, 2, GAO Jun1, KONG De-yi1, YOU Hui1, Juergen Brugger3
DOI: 10.3964/j.issn.1000-0593(2012)08-2050-06
FAIMS’s ion separation mechanism is based on analyte’s characteristic nonlinear relationship between its ion mobility and applied electric field strength. Present characterization methods for this nonlinear relationship are based on precarious assumptions which incur substantial errors under many circumstances. A rigorous method for solving the second and fourth taylor series coefficient of this relationship based on dispersion voltage value (assuming half-sinusoidal waveform) and associated compensation voltage value of spectrum peak is presented, alongside with rigorous analytical functions. FAIMS spectrums were obtained for ethanol, metaxylene and n-butanol using custom-built FAIMS spectrometer, and corresponding second and fourth taylor series coefficients were obtained with the proposed method. Evaluation shows that this method substantially reduces the RMS error between interpolated and measured peak compensation voltage values under different dispersion voltages, confirming its superiority over present methods. This rigorous method would help improve spectral resolutions of FAIMS spectrometer, facilitating high precision FAIMS spectrum database construction and accurate analyte discrimination.
2012 Vol. 32 (08): 2050-2055 [Abstract] ( 1495 ) PDF (1569 KB)  ( 441 )
2056 Research on the Universal Analytic Potential Function Applied to Diatomic Molecules
YU Chang-feng
DOI: 10.3964/j.issn.1000-0593(2012)08-2056-05
A new method on constructing analytical potential energy functions is presented, and from this a analytical potential energy function applied to both neutral diatomic molecules and charged diatomic molecular ions is obtained. In this paper, the potential energy function is examined by 21 examples of eight different basic kinds of diatomic molecules or ions——homonuclear ground-state for neutral diatomic molecule Na2-X1Σ+g,homonuclear excitation-state for neutral diatomic molecule C2-A1Πu,homonuclear ground-state for charged diatomic molecular ion He+2-X2Σ+u, homonuclear excitation-state for charged diatomic molecular ion N+2-B2Σu+, heteronuclear ground-state for neutral diatomic molecule NaLi-X1Σ+g, heteronuclear excitation-state neutral diatomic molecule BH-B1Σ+, heteronuclear ground-state for charged diatomic molecular ion (BC)--X3Π, and heteronuclear excitation-state for charged diatomic molecular ion (CS)+-A2Π etc. The theoretical values of the vibrational energy level of molecules calculated by the potential energy function are compared with RKR(Rydberg-Klein-Rees)or experimental data, and as a consequence, all the results are precisely consistent with RKR data.
2012 Vol. 32 (08): 2056-2060 [Abstract] ( 1442 ) PDF (1242 KB)  ( 508 )
2061 Photostimulated Luminescence and Color Centers Research in BaClxBr2-x∶Eu2+ Phosphors
TIAN Xiao-dong1, DONG Guo-yi1, JIANG Xiao-li2, LIU Qing-bo1, YANG Yan-min1
DOI: 10.3964/j.issn.1000-0593(2012)08-2061-04
Eu2+ doped BaClxBr2-x phosphors were prepared by solid state method in the present paper. The crystal structure and luminescent properties were studied by XRD, excitation, emission, and photostimulation. The XRD patterns indicate that the samples are single phase of BaClxBr2-x. The X-ray diffraction peak shifts to larger angle as the value of X increases. The emission spectra is a narrow band with a peak locating at 405 nm, which is attributed to the transition of 4f65d→4f7. The excitation spectrum excited by 405 nm is a broad band ranging from 250~380 nm with a peak locating at 303 nm. The photostimulation spectrum is a broad band ranging from 480~800 nm with a peak locating at 575 nm. Through fitting the spectrum curve, the photostimulation spectrum is composed of three bands with peaks locating at about 550, 610 and 685 nm. The three fitting bands correspond to the three color-centers belonging to F(Cl-), F(Cl-Br) and F(Br-)centers, respectively. The photostimulation peaks show a blue shift with increasing the ratio of Cl/Br.
2012 Vol. 32 (08): 2061-2064 [Abstract] ( 1425 ) PDF (1774 KB)  ( 460 )
2065 Study of Using Regional Mineral Spectra Library and Section Noise Filtering to Improve Mineral Identification Accuracy
WANG Ya-jun1, 2, LIN Qi-zhong1*, WANG Qin-jun1, LI Shuai3
DOI: 10.3964/j.issn.1000-0593(2012)08-2065-05
Aiming at the low accuracy of mineral identification with hyperspectral data, the present article established regional spectra library on the basis of the study area geological background, and presented a pretreatment method that filters the original spectra by section. First, continuum based fast Fourier transform was used to filter the noise among 2 000~2 200, 2 250~2 300 and 2 350~2 500 nm. Then apply the Rapid quantificational identification model with regional spectrum library was used to dispose the processed spectra. The highest effective rate of the result is 80%, and the highest accuracy rate is 67%. Compared with the identification result of original spectra, the average accuracy rate was upgraded by 17.7%, and the average effective rate was upgraded by 5.1%. Compared with the identification result of all-filtered spectra, the average accuracy rate was upgraded by 5.8%, while the average effective rate was upgraded by 39.8%. This method , which could guarantee that the identification result contains the most correct minerals and the fewest error ones, promoted mineral identification accuracy. The result with higher accuracy is significant to rapid mineral extraction work in field.
2012 Vol. 32 (08): 2065-2069 [Abstract] ( 1315 ) PDF (1978 KB)  ( 478 )
2070 Micro-FTIR Mapping Tracer for the Heterogeneity Growth of Nitrogen Impurities in Natural Diamond from Three Localities in China
SUN Yuan1, 3, QIU Zhi-li1, 3*, LU Tai-jin2, CHEN Hua2, CHEN Bing-hui1, 3, PENG Shu-yi1, 3, WEI Ran2, LI Liu-fen1, 3
DOI: 10.3964/j.issn.1000-0593(2012)08-2070-05
The geographic locality determination of diamonds is of great significance in understanding the mantle evolution, restricting the illegal trade of conflict diamonds, etc. In the present article, the in-situ analysis of micro-FTIR surface scan technique was first applied to analyze 14 IaAB natural diamond specimens from China’s three commercial localities. According to the FTIR spectra of diamonds, the nitrogen contents were calculated (1 616 data points of FTIR) and used for mapping tracer. The results showed that the nitrogen contents and its aggregation often varied in the process of diamond growth, and the nitrogen contents in initial nucleation stage could be higher or lower than in other stages. It is not an unidirectional variation for nitrogen contents in different growth stages, indicating that the carbon and nitrogen had a complex exchange with mantle fluid during the diamond’s crystallization course. It was regionally different between the diamonds from the three localities in the frequency distribution of nitrogen contents and NB%/N(T). Micro-FTIR mapping is more intuitive than the method of selecting discontinuous points, and it can trace the heterogeneous growth of nitrogen impurities in natural diamonds consecutively.
2012 Vol. 32 (08): 2070-2074 [Abstract] ( 1609 ) PDF (2368 KB)  ( 530 )
2075 Quantitative Prediction of Soil Salinity Content with Visible-Near Infrared Hyper-Spectra in Northeast China
ZHANG Xiao-guang1,2, HUANG Biao1*, JI Jun-feng3, HU Wen-you1, SUN Wei-xia1, ZHAO Yong-cun1
DOI: 10.3964/j.issn.1000-0593(2012)08-2075-05
Studying the spectral property of salinized soil is an important work, for it is the base of monitoring soil salinization by remote sense. To investigate the spectral property of salinized soil and the relationship between the soil salinity and the hyperspectral data, the field soil samples were collected in the region of Northeast China and then reflectance spectra were measured. The partial least squares regression (PLSR) model was established based on the statistical analysis of the soil salinity content and the reflectance of hyperspectra. The feasibility of soil salinity prediction by hyperspectra was decided by analyzed calibration model and independent validation. Models accuracy was also analyzed, which was established in the conditions of different treatment methods and different re-sampling intervals. The results showed that it was feasible to predict soil salinity content based on measured reflectance spectrum .The results also revealed that it was necessary to smooth measured hyperspectra for spectral prediction accuracy to be improved significantly after smoothing. The best model was established based on smoothed and log(1/x) transformed hyperspectra with high determination coefficients (R2 ) of 0.667 7 and RPD=1.61,which showed that this math transformation could eliminate noise effectively and so as to improve the prediction accuracy. The largest re-sampling interval is 8 nm that could meet the accuracy of the soil salinity prediction. Therefore, it provided scientific reference of monitoring soil salinization by remote sensing from satellite platform.
2012 Vol. 32 (08): 2075-2079 [Abstract] ( 733 ) PDF (1137 KB)  ( 688 )
2080 Transfer Calibration for Alcohol Determination Using Temperature- Induced Shortwave Near Infrared Spectra
FU Qing-bo1, SUO Hui1, HE Xin-ping1, 2, CONG Yu-liang3*
DOI: 10.3964/j.issn.1000-0593(2012)08-2080-05
The authors studied the temperature influence on short-wave near-infrared spectra of ethanol aquatic solution and utilized four methods to establish the transfer partial least squares (PLS) calibration model: direct transfer calibration, global calibration, orthogonal signal correction (OSC) and generalized least squares weighting (GLSW). The PLS models were built at four temperatures: 15, 25, 35 and 40 ℃. The results showed that direct calibration provided high prediction bias: significantly high positive prediction bias for a temperature lower than calibration temperature and negative bias for higher temperatures. By using the global correction, OSC and GLSW, the systematic errors could be reduced. However, the global correction needed more calibration samples and built a more complex model. The OSC and GLSW methods provided better predictions using fewer latent variables. By using the GLSW method, prediction bias less than 0.1% and RMSEP less than 0.9% were obtained. The absolute prediction error of GLSW method was less than 1.5%. Additionally, the GLSW provided smaller prediction error at every researched temperature using fewer latent variables than OSC. Thus, GLSW was superior to OSC and could establish more robust transfer calibration model.
2012 Vol. 32 (08): 2080-2084 [Abstract] ( 892 ) PDF (1934 KB)  ( 577 )
2085 Infrared Spectrum Denoising with Combination of Lifting Wavelet Domain Thresholding and Median Filtering
LIU Yan-ping, GAO Guo-rong*, GONG Ning, HUANG Rui-hua
DOI: 10.3964/j.issn.1000-0593(2012)08-2085-04
Infrared spectra are often corrupted by noise, which may greatly influence the accuracy and precision of the analytical result. To improve the analytical precision, the authors need to denoise the spectrum data first. In the present paper, a spectrum denoising method by the second generation wavelet transform domain thresholding combined with the median filtering is introduced. The spectrum of a certain kind of wheat was used to test the performance of the proposed denoising method. In the experiment,noise with signal to noise ratio 21.17 dB was first added to the spectrum,and then removed by the proposed denoising method. The signal to noise ratio (SNR), the root mean square error(RMSE),the average relative error of the peak value (AREPV) and the average error of the peak position (AEPP) were used to evaluate the performance of the proposed denoising method. Experimental results show that the proposed method can remove the spectrum noise and keep the useful information more effective than Donoho’s soft and hard threshold method. At the same time, it can achieve a higher PSNR, a lower RMSE, a lower AREPV and a lower AEPP than the other two denoising methods.
2012 Vol. 32 (08): 2085-2088 [Abstract] ( 635 ) PDF (1506 KB)  ( 529 )
2089 Research on the Combustion Mechanism of Asphalt and the Composition of Harmful Gas Based on Infrared Spectral Analysis
WU Ke1, ZHU Kai2, HUANG Zhi-yi1, WANG Jin-chang1*, YANG Qin-min3, LIANG Pei4
DOI: 10.3964/j.issn.1000-0593(2012)08-2089-06
By using the Rosemount gas analyzer and the test platform of fixed bed built by carbon furnace, the harmful gaseous compositions and the release rules of asphalt and mortar under high temperature rate were analyzed quantitatively based on infrared spectral analysis technology. The results indicated that the combustion process of the asphalt and mortar can be approximately divided into two stages stage of primary volatile combustion, and stage of secondary volatile release combined with fixed carbon combustion in isothermal condition with high heating rate. The major gaseous products are CO2, CO, NO, NO2 and SO2. the volatile content is one of the key factors affecting the release rules of gaseous combustion products in asphalt, and reducing the volatile content in asphalt materials can effectively reduce the generation of gaseous combustion products, especially CO.
2012 Vol. 32 (08): 2089-2094 [Abstract] ( 1518 ) PDF (2890 KB)  ( 445 )
2095 Nondestructive Discrimination of Strawberry Varieties by NIR and BP-ANN
NIU Xiao-ying1, SHAO Li-min2, ZHAO Zhi-lei1, ZHANG Xiao-yu1
DOI: 10.3964/j.issn.1000-0593(2012)08-2095-05
Strawberry variety is a main factor that can influence strawberry fruit quality. The use of near-infrared reflectance spectroscopy was explored discriminate among samples of strawberry of different varieties. And the significance of difference among different varieties was analyzed by comparison of the chemical composition of the different varieties samples. The performance of models established using back propagation-artificial neural networks (BP-ANN), least squares-support vector machine and discriminant analysis were evaluated on spectra range of 4 545~9 090 cm-1. The optimal model was obtained by BP-ANN with a topology of 12-18-3, which correctly classified 96.68% of calibration set and 97.14% of prediction set. And the 94.95%, 97% and 98.29% classifications were given respectively for “Tianbao” (n=99), “Fengxiang” (n=100) and “Mingxing” (n=117). One-way analysis of variance was made for comparison of the mean values for soluble solids content (SSC), titratable acid (TA), pH value and SSC-TA ratio, and the statistically significant differences were found. Principal component analysis was performed on the four chemical compositions, and obvious clustering tendencies for different varieties were found. These results showed that NIR combined with BP-ANN can discriminate strawberry of different varieties effectively, and the difference in chemical compositions of different varieties strawberry might be a chemical validation for NIR results.
2012 Vol. 32 (08): 2095-2099 [Abstract] ( 1895 ) PDF (1433 KB)  ( 443 )
2100 Rapid Determination of Fatty Acids in Soybean Oils by Transmission Reflection-Near Infrared Spectroscopy
SONG Tao1, ZHANG Feng-ping1, 2*, LIU Yao-min1, WU Zong-wen1, SUO You-rui3
DOI: 10.3964/j.issn.1000-0593(2012)08-2100-05
In the present research, a novel method was established for determination of five fatty acids in soybean oil by transmission reflection-near infrared spectroscopy. The optimum conditions of mathematics model of five components(C16∶0, C18∶0 , C18∶1, C18∶2 and C18∶3) were studied, including the sample set selection, chemical value analysis, the detection methods and condition. Chemical value was analyzed by gas chromatography. One hundred fifty eight samples were selected, 138 for modeling set, 10 for testing set and 10 for unknown sample set. All samples were placed in sample pools and scanned by transmission reflection-near infrared spectrum after sonicleaning for 10 minute. The 1 100~2 500 nm spectral region was analyzed. The acquisition interval was 2 nm. Modified partial least square method was chosen for calibration mode creating. Result demonstrated that the 1-VR of five fatty acids between the reference value of the modeling sample set and the near infrared spectrum predictive value were 0.883 9, 0.583 0, 0.900 1, 0.977 6 and 0.959 6, respectively. And the SECV of five fatty acids between the reference value of the modeling sample set and the near infrared spectrum predictive value were 0.42, 0.29, 0.83, 0.46 and 0.21, respectively. The standard error of the calibration (SECV) of five fatty acids between the reference value of testing sample set and the near infrared spectrum predictive value were 0.891, 0.790, 0.900, 0.976 and 0.942, respectively. It was proved that the near infrared spectrum predictive value was linear with chemical value and the mathematical model established for fatty acids of soybean oil was feasible. For validation, 10 unknown samples were selected for analysis by near infrared spectrum. The result demonstrated that the relative standard deviation between predict value and chemical value was less than 5.50%. That was to say that transmission reflection-near infrared spectroscopy had a good veracity in analysis of fatty acids of soybean oil.
2012 Vol. 32 (08): 2100-2104 [Abstract] ( 860 ) PDF (2027 KB)  ( 500 )
2105 Infrared Spectroscopic Analysis of Guilin Watermelon Frost Products
HUANG Dong-lan1, CHEN Xiao-kang1*, XU Yong-qun1, SUN Su-qin2, ZHOU Qun2, LU Wen-guan1
DOI: 10.3964/j.issn.1000-0593(2012)08-2105-05
The objective of the present study is to analyze different products of Guilin watermelon frost by Fourier transform infrared spectroscopy (FTIR), second derivative infrared spectroscopy and two-dimensional correlation spectroscopy (2D-IR) under thermal perturbation. The structural information of the samples indicates that samples from the same factory but of different brands had some dissimilarities in the IR spectra, and the type and content of accessories of them were different compared with conventional IR spectra of samples, peaks at 638 and 616 cm-1 all arise from anhydrous sodium sulfate in watermelon frost spray and watermelon frost capsule; the characteristic absorption peaks of the sucrose, dextrin or other accessories can be seen clearly in the spectra of watermelon frost throat-clearing buccal tablets, watermelon frost throat tablets and watermelon frost lozenge. And the IR spectra of watermelon frost lozenge is very similar to the IR spectra of sucrose, so it can be easily proved that the content of sucrose in watermelon frost lozenge is high. In the 2D-IR correlation spectra, the samples presented the differences in the position, number and relative intensity of autopeaks and correlation peak clusters. Consequently, the macroscopical fingerprint characters of FTIR, second derivative infrared spectra and 2D-IR spectra can not only provide the information about main chemical constituents in medical materials, but also analyze and identify the type and content of accessories in Guilin watermelon frost. In conclusion, the multi-steps IR macro-fingerprint method is rapid, effective, visual and accurate for pharmaceutical research.
2012 Vol. 32 (08): 2105-2109 [Abstract] ( 1648 ) PDF (1861 KB)  ( 539 )
2110 Noninvasive Measurement of Serum Total Protein Content by Near-Infrared Reflection Spectra with Tongue Inspection
LIN Ling1, LI Zhe1, LI Xiao-xia2, LI Yong-cheng1, LI Gang1, ZHANG Bao-ju3, SONG Wei3*
DOI: 10.3964/j.issn.1000-0593(2012)08-2110-07
The technology of tongue near-infrared reflectance spectra was used for human serum total protein (TP) content of noninvasive testing for the first time. Reflectance spectrum on the tongue tips of 58 volunteers was collected, and the biochemical values of serum total protein were recorded at the same time. The samples were separated into two parts: training set and prediction set. Two prediction models were established using PCA combined with BP neural network and PLS. Using PCA-BP model to predict the prediction set, the average relative error is 7.35%, RMSEP was 6.377 1 g·L-1, and the correlation coefficient was 0.902 1. Using PLS model to predict the prediction set, the average relative error is 4.77%, RMSEP was 0.130 4 g·L-1, and the correlation coefficient was 0.971 8. It was approved that reflectance spectra of tongue can be used to predict TP accurately and noninvasively.
2012 Vol. 32 (08): 2110-2116 [Abstract] ( 858 ) PDF (2080 KB)  ( 469 )
2117 Measuring Soil Water Content by Using Near Infrared Spectral Characteristics of Soil
LI Mei-ting, WU Hong-qi, JIANG Ping-an*, LU Xiang-jun, FU Yan-bo
DOI: 10.3964/j.issn.1000-0593(2012)08-2117-05
Different textured soils (sandy loam, silty clay loam and clay) from Manas County, Xinjiang were researched with indoor spectral reflectance, continuum removal was used to process soil spectra curve, and correlation analysis was made about normalized spectral reflectance and water content for modeling. The results show that different textured soils have reflectance in a order that clay>silty clay loam>sandy loam; the critical points of field capacity in sandy loam, silty clay loam and clay were 20.01%, 24.10% and 30.43% respectively, and water content was inversely proportional to spectral reflectance below such critical points while proportional above the points. Within 1 390~1 623 nm band, the negative correlation coefficients of soil water content and normalized spectra reflectance show better negative correlation and reaching significant levels, R2 of the model established for soil water content prediction exceeded mostly 0.8, and the average relative error of the model was 10%. The model could accurately reflect the soil moisture content, Its advantages such as accuracy, non-destruction and rapidness provide a new approach to measuring soil water content.
2012 Vol. 32 (08): 2117-2121 [Abstract] ( 1701 ) PDF (1448 KB)  ( 874 )
2122 Sugar Characterization of Mini-Watermelon and Rapid Sugar Determination by Near Infrared Diffuse Reflectance Spectroscopy
WANG Shuo1, YUAN Hong-fu1*, SONG Chun-feng1, XIE Jin-chun1, LI Xiao-yu1, FENG Le-ping2
DOI: 10.3964/j.issn.1000-0593(2012)08-2122-04
In the present paper, the distribution of sugar level within the mini-watermelon was studied, a new sugar characterization method of mini-watermelon using average sugar level, the highest sugar level and the lowest sugar level index is proposed. Feasibility of nondestructive determination of mini-watermenlon sugar level using diffuse reflectance spectroscopy information was investigated by an experiment. PLS models for measuring the 3 sugar levels were established. The results obtained by near infrared spectroscopy agreed with that of the new method established above.
2012 Vol. 32 (08): 2122-2125 [Abstract] ( 1581 ) PDF (2145 KB)  ( 467 )
2126 Study on Rapid Non-Destructive Detection of the Freshness of Paddy Based on NIRS
LI Juan1, 2, LI Zhong-hai1, 2*,FU Xiang-jin1,2
DOI: 10.3964/j.issn.1000-0593(2012)08-2126-05
A prediction model of paddy storage time was established based on near infrared reflectance(NIRS)and chemometrics. A spectroradiometer was used for collecting spectra in the wavelength range from 950 to 1 650 nm. The NIR spectra were collected from 90 samples of paddy. The best pretreatment method was obtained while choosing the total spectra area combined with PLS using the UNSCRAMBLER 9.7. The best pretreatment method is first derivative combined with S. Golay, and the number of principal components is 7. The model is feasible, because the r2 is 0.967 9, RMSEP is 54.51 and the result of T-test is passable while validation method is cross validation. In this paper, a feasible method is established to measure the storage time of paddy based on near infrared reflectance(NIRS)and chemometrics.
2012 Vol. 32 (08): 2126-2130 [Abstract] ( 671 ) PDF (2287 KB)  ( 881 )
2131 Similar Spectrum of Infrared Spectrum and Its Application in Identification of Chinese Herbs
XU Yong-qun1, CHEN Xiao-kang1*, CHEN Yong2, HUANG Dong-lan1, CHEN Zao-xin2, LU Wen-guan1
DOI: 10.3964/j.issn.1000-0593(2012)08-2131-04
In the present paper, the similar spectra of 18 samples, which include Astragalus, red-blue Astragalus and Codonopsis, were obtained in the range of 1 600~700 cm-1. The result showed that all kinds of herbs have their own characteristic similar spectra, and 18 samples can be identified according to the characteristic similar spectra. Furthermore, three correlation coefficients of 93 ganoderma samples were calculated which is in the range of 1 560~1 502, 1 460~1 421 and 1 319~1 260 cm-1 according to the information of similar spectrum of infrared spectrum of ganoderma. Without priori knowledge of the classification of these samples,the K-means cluster analysis can successfully divide them into four classes, i.e. Ganoderma lucidum and Ganoderma sinensis, Ganoderma atrum, Ganoderma aoshiba, Ganoderma multiplicatum. This result is consistent with the result of morphological classification.
2012 Vol. 32 (08): 2131-2134 [Abstract] ( 1434 ) PDF (1867 KB)  ( 569 )
2135 Study on Rapid Quantitative Analysis of the Active Ingredient in ABC Extinguishing Agent and Type Identification of Extinguishing Agent Powders Using Near Infrared Spectroscopy
HU Ai-qin1, YUAN Hong-fu1*, XUE Gang2, SONG Chun-feng1, LI Xiao-yu1, XIE Jin-chun1
DOI: 10.3964/j.issn.1000-0593(2012)08-2135-04
A new quantitative method to determine the NH4H2PO4 in ABC powder extinguishing agent and to distinguish between ABC and BC powder extinguishing agents using near infrared diffuse reflectance spectroscopy is proposed. A PLS calibration model for the NH4H2PO4 content in extinguishing agent powder was established, with RMSECV=2.1,RMSEP=2.4. An identification model for ABC and BC powder extinguishing agents was built by SIMCA and the identification accuracy rate is 100%. This method, compared to the present standard method, has the characteristics of rapidness and easy operation, whichis fit for the quantitative analysis and type distinguishing of the fire products on site.
2012 Vol. 32 (08): 2135-2138 [Abstract] ( 310 ) PDF (1719 KB)  ( 538 )
2139 Raman Spectroscopic Investigation of Hydrogen Storage in Nitrogen Gas Hydrates
MENG Qing-guo1,2, LIU Chang-ling1,2, YE Yu-guang1,2, LI Cheng-feng2,3
DOI: 10.3964/j.issn.1000-0593(2012)08-2139-04
Recently, hydrogen storage using clathrate hydrate as a medium has become a hotspot of hydrogen storage research. In the present paper, the laser Raman spectroscopy was used to study the hydrogen storage in nitrogen hydrate. The synthetic nitrogen hydrate was reacted with hydrogen gas under relatively mild conditions (e. g. 15 MPa, -18 ℃). The Raman spectra of the reaction products show that the hydrogen molecules have enclathrated the cavities of the nitrogen hydrate, with multiple hydrogen cage occupancies in the clathrate cavities. The reaction time is an important factor affecting the hydrogen storage in nitrogen hydrate. The experimental results suggest that nitrogen hydrates are expected to be an effective media for hydrogen storage.
2012 Vol. 32 (08): 2139-2142 [Abstract] ( 1524 ) PDF (1402 KB)  ( 467 )
2143 Infrared and Raman Spectra Study on Tianhuang
LIU Yun-gui1, CHEN Tao1, 2*
DOI: 10.3964/j.issn.1000-0593(2012)08-2143-04
The Tianhuang stones, from Shoushan in China, were studied by using X-ray powder diffractometry (XRD), infrared (IR) spectroscopy and Raman spectroscopy to obtain the spectra characterization. Wave numbers 3 621, 3 629 and 3 631 cm-1 in the IR spectra and 3 626, 3 627 and 3 632 cm-1 in the Raman spectra are the characteristic peaks of dickitic Tianhuang, nacritic Tianhuang and illitic Tianhuang, respectively. Raman spectra assigned to OH are in good agreement with the IR results at 3 550~3 750 cm-1. Dickitic Tianhuang includes ordered dickite and disordered dickite. Compared with ordered dickite, the band assigned to OH3 of disordered dickite shifts to low-frequency by 8 cm-1 and the relative intensity becomes stronger. The disorder structure may relate to the high level of Fe. The IR absorption spectra of nacritic Tianhuang superimposes strong peaks of dickite, indicating that IR absorption bands of dickite are stronger than that of nacrite at 3 550~3 750 cm-1. The main mineral composition of illitic Tianhuang is 2M1, while illite Tianhuang contains a small amount of 1M. All these characters provide a theoretical basis for the scientific identification of Tianhuang.
2012 Vol. 32 (08): 2143-2146 [Abstract] ( 1595 ) PDF (2074 KB)  ( 542 )
2147 Self-Assembled Film of Gold Nanoparticles at a Air/Water Interface Used as a SERS Substrate to Detect Melamine
XIAO Hai-bo, ZHANG Qin*, GUO Wei, PAN Xiao-hui, HUANG Zhi-yong*
DOI: 10.3964/j.issn.1000-0593(2012)08-2147-05
Self-assembled monolayer film of gold nanoparticles (55 nm) was formed at air-water interface by the driving force of wettability-shift of gold nanoparticles from hydrophilic property to hydrophobic property when encapsulated with 1-dodecanethiol. SEM image shows that the structure of the surface is nearly monolayer with closed arrays of uniform particle size when the film is transferred onto Si wafer. The substrate can be used for SERS substrate to realize semiquantitative analysis of melamine and the detection limit can reach 1×10-9 g·L-1. This SERS substrate is of wide application, not only for melamine but also for nonpolar molecule such as polycyclic aromatic hydrocarbons.
2012 Vol. 32 (08): 2147-2151 [Abstract] ( 833 ) PDF (1960 KB)  ( 632 )
2152 Raman Spectroscopy Analysis of Carbon Structural Evolution of Diesel Particulate Matters with the Treatment of Nonthermal Plasma
HAN Wen-he, CAI Yi-xi, LI Xiao-hua, WANG Jun, WANG Jing, LI Kang-hua, WEI Xing
DOI: 10.3964/j.issn.1000-0593(2012)08-2152-05
Original and nonthermal plasma treated particulate matters(PM) samples of a diesel were obtained and characterized by Raman spectroscopy. A five-bands model was adopted for Raman spectrum curve fitting. As parameters involving most information about carbon structure, variation of FWHM of D1 band and D3 relative intensity were analyzed. It was found that original PM presented higher graphical structural order and lower chemical heterogeneity with the increase in the diesel load. After the treatment of NTP, the graphical structural order and chemical heterogeneity of PM kept at a relative stable level, affected very slightly by diesel load. Meanwhile, the amount of molecular carbon in PM increased. Further study for relation between structural evolution and chemical reactivity of PM with chemical kinetics would make Raman spectroscopy of great promise to become an important method for PM characterization, which could provide basis for more effective removal.
2012 Vol. 32 (08): 2152-2156 [Abstract] ( 1547 ) PDF (1847 KB)  ( 406 )
2157 Curve Fitting Based on Genetic Algorithms for Quantitative Resolution in Overlapped Fluorescence Spectra
XIA Xiang-hua, SUN Han-wen*
DOI: 10.3964/j.issn.1000-0593(2012)08-2157-05
The exponentially modified Gaussian (EMG) model-based genetic algorithm was used as a fitness function for fitting fluorescence spectrogram. The method was effective for solving the interference of fluorescent substance in the course of the multi-component quantitative analysis. As an example,the interference of endogenous fluorophores in different urines with the fluorescence of gatifloxacin (GFLX) was examined. A good eradicating efficacy was achieved by using the fitting fluorescence spectrogram. Under the optimized experimental conditions, the good linear relationship between the fluorescence intensity and GFLX concentration was obtained in the range of 0.06~3.5 μg·mL-1 with a correlation coefficient of 0.999 4. The detection limit and recovery were 0.02 μg·mL-1 and 99.2%~109.4%, respectively, with the relative standard deviation from 1.3% to 2.7%. The proposed fitting fluorescence spectrometric method was rapid, simple and highly sensitive for the determination of GFLX in different human urine without preseparation. The recovery, selectivity, linearity, precision and accuracy of the method are convenient for routine assays and pharmacokinetic studies.
2012 Vol. 32 (08): 2157-2161 [Abstract] ( 727 ) PDF (1810 KB)  ( 485 )
2162 Effects of PEMF on Fluorescence Spectra of Rats Serum
ZHANG Ya-mei1, ZHOU Yan1, 2, PANG Xiao-feng1*
DOI: 10.3964/j.issn.1000-0593(2012)08-2162-04
To investigate the relationship between the fluorescence spectra of serum and the brain injury effect, the alteration of fluorescence emission in serum was collected by fluorescence spectroscopy, the pathologic changes in the rat brain were obvious by histopathology after exposure to PEMF. Sprague-Dawley male rats were randomized into sham exposed and PEMFs exposed groups. After exposure to PEMF(3.5 ns rising time, 14 ns pulse width, and amplitude up to 200 kV/400 kV at 1 Hz repetitive rate) at 0.5, 1, 3, 6 and 12 h, the expression of S100B and the fluorescence spectra in serum were detected, the changes in brain morphology were observed. The results showed that the fluorescence intensity of 400 kV groups were higher than 200 kV groups at different time points after exposure to PEMF. It suggests that the extent of brain injury was associated with the pulse frequency. The trends of fluorescence spectra in serum coincide with the expression of S100B and pathologic changes. It shows that fluorescence spectroscopy could apply to analysis of the effect of brain injury after exposure to PEMF.
2012 Vol. 32 (08): 2162-2165 [Abstract] ( 1354 ) PDF (2000 KB)  ( 426 )
2166 Interaction between Latex Microspheres and Antibody Proteins Revealed by Fluorescence Spectroscopy
YU Si-ming1, PENG Yun-ping1, 2*, YU Shu-juan1, Lü Huan1, GUO Cheng1
DOI: 10.3964/j.issn.1000-0593(2012)08-2166-05
Latex-antibody complexes were prepared by the method of covalent coupling and the properties of the complexes were studied by fluorescence spectrophotometric method for the purpose of revealing the interaction between latex microspheres and antibody proteins. Analysis of intrinsic fluorescence spectra showed that after being coupled with latex microspheres, the emission maximum of antibody protein showed an obvious blue shift, the intensity of emission maximum decreased significantly, the tertiary structure of antibody protein changed to some extent, the interaction between latex microspheres and antibody proteins had a great quenching effect on the intrinsic fluorescence spectra of antibody proteins, the quenching effect was enhanced along with the increasing pH value and latex concentration, and the quenching mechanism was static quenching. Results of exogenous fluorescence spectra showed that the fluorescence intensity of emission maximum was enhanced significantly after being coupled with latex microspheres, the hydrophobicity of antibody protein was decreasing with the increase in the pH values, however, due to the increasing latex concentration, the hydrophobicity antibody protein was increasing.
2012 Vol. 32 (08): 2166-2170 [Abstract] ( 1483 ) PDF (1626 KB)  ( 557 )
2171 Studies on Micelle Behaviors of Sophorolipid Biosurfactant by Steady-State Fluorescence Probe Method
SONG Dan-dan1,2, LIANG Sheng-kang1,2*, WANG Jiang-tao1,2, WANG Xiu-lin1,2
DOI: 10.3964/j.issn.1000-0593(2012)08-2171-05
The critical micelle concentration (CMC) of sophorolipid was determined by steady-state fluorescence probe method in which pyrene was used as fluorescence probe. Meanwhile, the changes in the sophorolipid CMC were examined in the addition of NaCl and aliphatic alcohol, respectively. The results showed that the CMC of sophorolipid was 1.3×10-4 mol·L-1 and had a slight decrease as NaCl concentration increased. However, the CMC of sophorolipid appeared to increase in the presence of aliphatic alcohol. The aggregation numbers and the micelle size of sophorolipid solution were investigated by fluorescence quenching and laser light scattering method. The aggregation numbers were 4~8 with the concentrations of sophorolipid in the range of 4~8 CMC and the micelle mean diameter for sophorolipid with the concentration of 6 CMC was about 90 nm. These experimental results indicated that the micelle should be incompact.
2012 Vol. 32 (08): 2171-2175 [Abstract] ( 1819 ) PDF (1623 KB)  ( 885 )
2176 Ultraviolet Absorption Spectrum Analysis and Identification of Medicinal Plants of Paris
ZHANG Jin-yu1, WANG Yuan-zhong1, ZHAO Yan-li1, YANG Shao-bing1, ZHANG Ji1, YUAN Tian-jun2, WANG Jia-jun3, JIN Hang1*
DOI: 10.3964/j.issn.1000-0593(2012)08-2176-05
Species of Paris are important medicinal plants of China. They possess anticancer, hot alexipharmic, detumescence, acesodyne, and arrest blood and remove blood stasis effects. They are the main raw material for several Chinese patent drugs such as “Yunnan Baiyao”, “Gong Xue Ning”, “Re Du Qing” and “Ji De Sheng Sheyaopian”. The present paper, through optimizing the chloroform, absolute ethyl alcohol and water extraction condition of Paris by orthogonal test L43 (16), using mean value, smoothness and second differential methods on the observed UV spectrum, to inspects the RSD of stability and repeatability of different waveband. By SIMCA and the common and variant peak ratio dual index sequence analysis method, it evaluated the quality and quantity of Paris. The results showed that at the time of 50, 40 and 50 min, chloroform, absolute ethyl alcohol and water had the highest extraction ratios. Within 20 h, the RSDs of stability were 0.06~1.88, 0.05~2.42 and 0.03 ~0.35; the RSDs of accuracy were 0~1.48, 0.05~0.37 and 0.09~0.44; and the RSDs of repeatability were 0~1.23, 0.04~0.30 and 0.12~0.25 respectively. The qualitative analysis revealed large differences between different Paris species and different areas. The quantitative analysis indicated that the highest common peak ratio among the Paris samples was 80.00% and the lowest variant peak ratio was 6.25%. The method evaluated Paris of different species and from different producing areas, and also quantitatively assessed the arbitrary two samples, clarified the similarity between the species and areas of Paris, which provided basis of distinguishing the real and false, identification of variety and quality evaluation for Chinese herbal medicine.
2012 Vol. 32 (08): 2176-2180 [Abstract] ( 1570 ) PDF (1653 KB)  ( 608 )
2181 Study on the Mechanism of Liesegang Pattern Development During Carbonating of Traditional Sticky Rice-Lime Mortar
WEI Guo-feng1, 3, FANG Shi-qiang2, ZHANG Bing-jian3*, WANG Xiao-qi4, LI Zu-guang2
DOI: 10.3964/j.issn.1000-0593(2012)08-2181-04
Liesegang patterns in traditional sticky rice-lime mortar undergoing carbonation were investigated by means of FTIR, XRD and SEM. Results indicate that well-developed Liesegang patterns only occur in the mortar prepared with aged lime and sticky rice. The smaller Ca(OH)2 particle size in aged lime and the control of the sticky rice for the crystallization of calcium carbonate lead to the small pores in this mortar. These small pores can make Ca2+ and CO2-3 highly supersaturated, which explains the reason why Liesegang pattern developed in the sticky rice-aged lime mortar. The formed metastable aragonite proves that Liesegang pattern could be explained based on the post-nucleation theory.
2012 Vol. 32 (08): 2181-2184 [Abstract] ( 1431 ) PDF (2055 KB)  ( 475 )
2185 Study on a Method for Fast Selecting Feature Wavelengths from the Spectral Information of Crop Nitrogen
XU Tian-shuang1, XU Tao1, LAN Yu-bin2, WU Wen-fu3, ZHANG Hui-hui4, ZHU Hang1*
DOI: 10.3964/j.issn.1000-0593(2012)08-2185-05
Research on a method for fast selecting feature wavelengths from the nitrogen spectral information is necessary, which can determine the nitrogen content of crops. Based on the uniformity of uniform design, the present paper proposed an improved particle swarm optimization (PSO) method. The method can choose the initial particle swarm uniformly and describe the optimization space well by fewer sample points, which is helpful to avoiding the local optimum and accelerate the convergence. Then, the method was applied to fast select the nitrogen spectral wavelengths of soybean, cotton and maize. Calibration models based on the partial least square (PLS) method and selected wavelengths were constructed. The results illustrate that compared with the original wavelengths, the number of selected wavelengths decreases about 93%, which means the computation is simplified. Also, the precision of PLS prediction mode based on the selected wavelengths improves by 34% at least, and the prediction ability of calibration model increases greatly. Therefore, the proposed method is both correct and effective.
2012 Vol. 32 (08): 2185-2189 [Abstract] ( 1313 ) PDF (1540 KB)  ( 503 )
2190 Study of Spectrum Drifting of Primary Colors and Its Impact on Color Rendering Properties
CUI Xiao-yan1, ZHANG Xiao-dong2*
DOI: 10.3964/j.issn.1000-0593(2012)08-2190-04
LEDs are currently used widely to display text, graphics and images in large screens. With red, green and blue LEDs as three primary colors, color rendition will be realized through color mixing. However, LEDs’ spectrum will produce drifts with the changes in the temperature environment. With the changes in the driving current simulating changes in the temperature, the three primary color LEDs’ spectral drifts were tested, and the drift characteristics of the three primary colors were obtained respectively. Based on the typical characteristics of the LEDs and the differences between LEDs with different colors in composition and molecular structure, the paper analyzed the reason for the spectrum drifts and the drift characteristics of different color LEDs, and proposed the equations of spectrum drifts. Putting the experimental data into the spectrum drift equations, the paper analyzed the impacts of primary colors on the mixed color, pointed out a way to reduce the chromatic aberration, and provided the theory for engineering application of color LEDs.
2012 Vol. 32 (08): 2190-2193 [Abstract] ( 1465 ) PDF (1439 KB)  ( 521 )
2194 Improving Component Analysis Ability of the Complex Mixed Solutions by Multi-Dimensional Diffuse Transmittance Spectrometry
XIONG Chan1, 4, LIN Ling1, WANG Meng-jun2, LI Gang1, 4, ZHANG Bao-ju3*
DOI: 10.3964/j.issn.1000-0593(2012)08-2194-06
The multi-dimensional diffuse transmittance spectrums were collected by the traditional near-infrared transmittance method combined with a scanning device, and then used for component analysis of the complex mixed solution. A xenon light, an electric control translation stage and a spectrometer were gathered to set up a device; Intralipid-20%, India-ink and C6H12O6 were used to prepare 225 kinds of complex mixed solutions; the diffuse transmittance spectrums were measured at 20 points off the transmission center distributed from 0~5 mm (interval 0.25 mm); the single and multi-point diffuse transmittance spectrums were analyzed by partial least squares regression for modeling and prediction. The results show that the modeling and prediction accuracy of the concentrations of the intralipid-20% and India-ink increased with the growing of the transmittance points, but the concentration of the C6H12O6 did not increase. It is proved that the spectrums collected by different points can raise the signal to noise radio of the strong absorption and scattering substance, and the signal to noise radio of the weak absorption and scattering substance would be improved by increasing the current system accuracy.
2012 Vol. 32 (08): 2194-2199 [Abstract] ( 1509 ) PDF (2423 KB)  ( 418 )
2200 Study of Residue Preservatives Thiabendazole,o-Phenylphenol and Diphenyl in Fruits and Vegetables by SPE-Separation Technology
BAI Juan-juan, Mamat Ahmat, Arkin Iburaim*
DOI: 10.3964/j.issn.1000-0593(2012)08-2200-04
The residue of thiabendazole, o-phenylphenol and diphenyl in vegetables and fruits was detected by solid-phase extraction and ultraviolet-spectrophotometry. Samples were extracted under basic conditions with petroleum ether: ethyl acetate(2∶1). The analytes were first enriched, purified and separated through a C18 solid-phase extraction column. Thiabendazole, o-phenylphenol and diphenyl in the C18 solid-phase extraction column were eluted with 30% ethanol-acid solution(pH 2.5),55% methanol -alkaline solution(pH 11.5) and 75% ethanol-acid solution(pH 2.5) respectively ,then detected by ultraviolet-spectrophotometry. The linear ranges were from 1 to 10 μg·mL-1 with a good linear relationship (r>0.999 8) for thiabendazole, o-phenylphenol and diphenyl. The recovery range was from 72.1% to 103.5%, with the relative standard deviations between 1.2% and 7.7%. The limit of detection (S/N=3) was 0.09 μg·mL-1 (TBZ), 0.5 μg·mL-1(OPP) and 0.1 μg·mL-1(DP). The method was successfully applied to residues of preservatives in fruits and vegetables. These results indicated that this method is simple, rapid and sensitive for the simultaneous determination requirements of residues in vegetables and fruits.
2012 Vol. 32 (08): 2200-2203 [Abstract] ( 795 ) PDF (1465 KB)  ( 466 )
2204 Cool/Hot Target Effect of the Water Fog Infrared Stealth
DU Yong-cheng, YANG Li, ZHANG Shi-cheng, YANG Zhen, HU Shuang-xi
DOI: 10.3964/j.issn.1000-0593(2012)08-2204-05
Artificial spray fog will come into being cool target because of the strong evaporation and convection but weak radiation heat flux, when it is used for defence of infrared imaging guided missile. Also, when it is the contrary condition, the water fog will come into being hot target. In order to open out the phenomenon particularly, a math model which can account for the cool/hot effect produced by water fog shielding the thermal radiation is established by coupling the calculation of radiation transfer equation and energy conversation equation, based on the Mie theory. This model is proved to be accurate in comparison with the Monte-Carlo method and Lambert-Beer’ law. The water fog is seemed as absorbing, emitting and anisotropic scattering medium, and the medium radiation, multiple scattering, target radiation flux, and environment influence such as the conductivity, convection turbulent heat diffusion and evaporation is calculated. The phenomenon of cool/hot target effect can be shown in detail with this model.
2012 Vol. 32 (08): 2204-2208 [Abstract] ( 443 ) PDF (2320 KB)  ( 424 )
2209 Preparation and Characterization of Modified Kaolins and Their Photocatalytic Property
WANG Ding, JIAN Li, CHENG Lin, MA Hui-yan, ZHANG Qian-cheng*
DOI: 10.3964/j.issn.1000-0593(2012)08-2209-05
In order to develop the cheap and efficient photocatalysts, kaolins were modified through calcination and acid leaching. In succession, the prepared samples were characterized using thermal gravimetric-differential thermal analysis (TG-DTA), scanning electron microscope (SEM) coupled with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV-Vis) and BET specific surface area measurements (BET). Methyl orange, used as a model reactant, was degraded under UV light irradiation to evaluate the photocatalytic activities of the prepared samples. From UV-Vis spectroscopy analyses, an obvious increase in the red shift of the absorption edge was observed for the samples treated with acid. The acid sites generated during the modification of kaolin were determined through adsorbed pyridine analysis using infrared spectroscopy (Py-IR). Kaolins modified using over 30% H2SO4 contained both Brnsted and Lewis acid sites. Combining the results of photocatalytic experiment with the conclusions of Py-IR and XRD, the acid properties of the prepared samples were the main factors that affected their catalytic activity.
2012 Vol. 32 (08): 2209-2213 [Abstract] ( 1219 ) PDF (2247 KB)  ( 530 )
2214 Research on Spectral Response of CdSe Quantum Dots Dopted Polymer Solar Cell
CHEN Zheng1, DENG Zhen-bo1*, ZHOU Mao-yang1, Lü Zhao-yue2, YIN Yue-hong1, ZOU Ye1, DU Hai-liang1, LUN Jian-chao1
DOI: 10.3964/j.issn.1000-0593(2012)08-2214-04
In the present paper, bulk heterojunction polymer solar cells based on P3HT∶PCBM and P3HT∶PCBM∶QDs active layer were fabricated and measured respectively. The experimental result showed that the addition of QDs can broaden the spectral response and enhance photoinduced electron transfer. The conversion efficiency of device with QDs is about 25% higher than that without QDs.
2012 Vol. 32 (08): 2214-2217 [Abstract] ( 577 ) PDF (1565 KB)  ( 512 )
2218 MTCARI:A Kind of Vegetation Index Monitoring Vegetation Leaf Chlorophyll Content Based on Hyperspectral Remote Sensing
MENG Qing-ye, DONG Heng, QIN Qi-ming*, WANG Jin-liang, ZHAO Jiang-hua
DOI: 10.3964/j.issn.1000-0593(2012)08-2218-05
The chlorophyll content of plant has relative correlation with photosynthetic capacity and growth levels of plant. It affects the plant canopy spectra, so the authors can use hyperspectral remote sensing to monitor chlorophyll content. By analyzing existing mature vegetation index model, the present research pointed out that the TCARI model has deficiencies, and then tried to improve the model. Then using the PROSPECT+SAIL model to simulate the canopy spectral under different levels of chlorophyll content and leaf area index (LAI), the related constant factor has been calculated. The research finally got modified transformed chlorophyll absorption ratio index (MTCARI). And then this research used optimized soil background adjust index (OSAVI) to improve the model. Using the measured data for test and verification, the model has good reliability.
2012 Vol. 32 (08): 2218-2222 [Abstract] ( 1397 ) PDF (1469 KB)  ( 504 )
2223 Geometric Distortion Correction for Hyperspectral Image Using a Rotating Scan Reflector
KE Gang-yang1, AN Ning1, TIAN Yang-chao1, MA Zhi-hong2, HUANG Wen-jiang2, WANG Qiu-ping1*
DOI: 10.3964/j.issn.1000-0593(2012)08-2223-05
Offner imaging spectrometer is a kind of pushbroom imaging system. Hyperspectral images acquired by Offner imaging spectrometers require relative motion of sensor and scene that is translation or rotation. Via rotating scan with a reflector at the front of sensor’s len, large objects can be entirely captured. But for the changes in object distances, geometric distortion occurs. A formula of space projection from an object point to an image point by one capture was derived. According to the projection relation and slit’s motion curve, the object points’ coordinates on a reference plan were obtained with rotation angle for a variable. A rotating scan device using a reflector was designed and installed on an Offner imaging spectrometer. Clear images were achieved from the processing of correction algorithm.
2012 Vol. 32 (08): 2223-2227 [Abstract] ( 386 ) PDF (2224 KB)  ( 473 )
2228 Detection of Activity of POD in Tomato Leaves Based on Hyperspectral Imaging Technology
FANG Hui, ZOU Qiang, HE Yong, LI Xiao-li*
DOI: 10.3964/j.issn.1000-0593(2012)08-2228-06
Activities of POD in tomato leaves were measured rapidly using hyperspectral imaging technology combined with chemometrics method. Operation process was: extracting spectra curve, pretreatment of spectra data, extracting characteristic wavelengths with SPA, and establishing prediction model for determining POD activities. In comparison with other methods such as SG, SNV, MSC, 1-Der and 2-Der, DOSC was the optimal pretreatment. It was shown in this research that SPA-PLS model was the optimal effective model among all models (SPA-MLR, SPA-PLS, SPA-BPNN and SPA-LS-SVM) for forecasting POD activities. The model was based on reflectance information of effective wavelengths (443, 464, 413, 410, 401, 402, 426 and 926 nm) extracted by SPA. Rp and RMSEP were 0.935 3 and 37.80 U·g-1, respectively. The result indicated that it was feasible to determine the POD activities with hyperspectral imaging technology, and the prediction accuracy of model was satisfactory. It was a new method for dynamic observation of POD activities and growth state of tomato.
2012 Vol. 32 (08): 2228-2233 [Abstract] ( 3011 ) PDF (1919 KB)  ( 616 )
2234 Research of Heavy Metals Determination in Cereals by Inductively Coupled Plasma Mass Spectrometry
LU Mei-bin, WANG Bu-jun*, LI Jing-mei, LI Wei-xi, YANG Xiu-lan, SONG Jing-ke
DOI: 10.3964/j.issn.1000-0593(2012)08-2234-04
The present paper established the determination method of heavy metals such as As, Pb, Hg and Cd in cereals by inductively coupled plasma mass spectrometry (ICP-MS) with microwave digestion. The pretreatment conditions were improved and the instrument operating parameters were optimized. 72Ge, 115In and 209Bi were selected as the internal standard elements to overcome the matrix effects and instrument fluctuations effectively. Interference correction equations were used to eliminate the interference of polyatomic ions. Satisfactory linearity of standard curves was obtained with elemental correlation coefficients over 0.999 9. The detection limits were in the range of 0.000 6~0.016 mg·L-1, the recoveries of samples were 90%~110%, and the RSD was within 5%. The accuracy of the method was evaluated with national standard reference materials and the interference test was experimented using standard solution. Studies have shown that the method is suitable for rapid determination of heavy metals As, Pb, Hg and Cd in cereals with wide linear range, good precision and high accuracy.
2012 Vol. 32 (08): 2234-2237 [Abstract] ( 1442 ) PDF (1057 KB)  ( 557 )
2238 Variation in Soil Mn Fractions as Affected by Long-Term Manure Amendment Using Atomic Absorption Spectrophotometer in a Typical Grassland of Inner Mongolia
FU Ming-ming1, JIANG Yong1*, BAI Yong-fei2, ZHANG Yu-ge3, XU Zhu-wen1, LI Bo1
DOI: 10.3964/j.issn.1000-0593(2012)08-2238-04
The effect of sheep manure amendment on soil manganese fractions was conducted in a 11 year experiment at inner Mongolia grassland, using sequential extraction procedure in modified Community Bureau of Reference, and determined by atomic absorption spectrophotometer. Five treatments with dry sheep manure addition rate 0, 50, 250, 750, and 1 500 g·m-2·yr-1, respectively, were carried out in this experiment. Results showed that the recovery rate for total Mn was 91.4%~105.9%, as the percentage recovered from the summation of the improved BCR results with aqua regia extractable contents, and it was 97.2%~102.9% from Certified Soil Reference Materials. Plant available exchangeable Mn could be enhanced by 47.89%, but reducible and total Mn contents decreased significantly under heavy application of manure at depth of 0~5 cm. The effect of manure amendment on Mn fractions was greater in 0~5 cm than in 5~10 cm soil layer. The results are benefit to micronutrient fractions determination and nutrient management in grassland soils.
2012 Vol. 32 (08): 2238-2241 [Abstract] ( 1539 ) PDF (1393 KB)  ( 469 )
2242 Determination of Soil Exchangeable Base Cations by Using Atomic Absorption Spectrophotometer and Extraction with Ammonium Acetate
ZHANG Yu-ge1, XIAO Min1, DONG Yi-hua1, JIANG Yong2
DOI: 10.3964/j.issn.1000-0593(2012)08-2242-04
A method to determine soil exchangeable calcium (Ca), magnesium (Mg), potassium (K), and sodium (Na) by using atomic absorption spectrophotometer (AAS) and extraction with ammonium acetate was developed. Results showed that the accuracy of exchangeable base cation data with AAS method fits well with the national standard referential soil data. The relative errors for parallel samples of exchangeable Ca and Mg with 66 pair samples ranged from 0.02%~3.14% and 0.06%~4.06%, and averaged to be 1.22% and 1.25%, respectively. The relative errors for exchangeable K and Na with AAS and flame photometer (FP) ranged from 0.06%~8.39% and 0.06~1.54, and averaged to be 3.72% and 0.56%, respectively. A case study showed that the determination method for exchangeable base cations by using AAS was proven to be reliable and trustable, which could reflect the real situation of soil cation exchange properties in farmlands.
2012 Vol. 32 (08): 2242-2245 [Abstract] ( 1392 ) PDF (1286 KB)  ( 616 )
2246 Infrared Spectroscopy and XRD Studies of Coral Fossils
CHEN Quan-li1, ZHOU Guan-min2, YIN Zuo-wei1
DOI: 10.3964/j.issn.1000-0593(2012)08-2246-04
Coral fossil is an old remain of multicellular animal on the earth, and formed by various geological processes. The structural characteristics and compositions of the coral fossils with different color and radial texture on the surface were studied by infrared absorption spectroscopy and X-ray powder diffraction analyses. The results show that the studied coral fossils mainly are composed of SiO2, and the radial microstructure characterized by the calcareous coral cross-section is preserved. It is formed by metasomatism by SiO2. The infrared absorption spectra of the coral fossil with different color and texture are essentially the same, showing typical infrared absorption spectra of the quartz jade. XRD analysis shows that the main components of the coral fossils with different color and texture are consistent and mainly composed of SiO2 with a trace amount of other minerals and without CaCO3.
2012 Vol. 32 (08): 2246-2249 [Abstract] ( 1567 ) PDF (1358 KB)  ( 487 )
2250 Determination of 16 Elements in the Different Pine Pollen by TXRF
CHEN Wei1, 2, HAN Xiao-feng1, Lü Jian-gang1, LIU Wei-wei3, TIAN Yu-hong1, WU Xu-ran1*
DOI: 10.3964/j.issn.1000-0593(2012)08-2250-04
After microwave digestion, 16 elements in pine pollen were simultaneously determined by TXRF. The results show that all the 16 elements were found in all pine pollens. There was a significant difference in the average content of the element such as Ca, Ti, Mn, Zn and Rb between different groups of pine pollen (P≤0.01). There was a difference in the average content of the element such as K, V, Fe, Co, Cu and Sr between them (P≤0.05). And there was no difference in the average content of the element such as Cr, Ni, As, Pb and Se between them. The results also show that pine pollen has the spectral characteristics of warm property or cold property drug. They were closely related to the tree species and the growth environment or the growth area.
2012 Vol. 32 (08): 2250-2253 [Abstract] ( 1327 ) PDF (1063 KB)  ( 557 )
2254 Chemical Composition and Chromaticity Characteristic of Jilan Glaze of Ming and Qing Official Kilns
WU Jun-ming1, ZHANG Mao-lin1, LI Qi-jiang1, WU Juan1, QUAN Kui-shan2, CAO Jian-wen1
DOI: 10.3964/j.issn.1000-0593(2012)08-2254-06
Color glazes of Ming and Qing official kilns are excellent representatives of the famous ancient Chinese porcelains. The study of official ware with Jilan glaze has been an important topic. But it made slow progress due to the rarity of samples with strict production management and using system. The recipes, chemical composition and chromaticity characteristic of the Jilan samples excavated from official kilns in the Ming and Qing dynasties were first discussed by systematical testing with the energy dispersive X-ray fluorescence (EDXRF) and color difference meter. The results showed that the porcelain stone content in Jilan bodies of official kiln in the Ming dynasty is higher than the samples of the Qing dynasty. The manganese content in Jilan glazes of the Ming dynasty is higher than that in the Qing dynasty, while the glaze ash addition and the lightness value in the glaze are opposite.
2012 Vol. 32 (08): 2254-2259 [Abstract] ( 1353 ) PDF (1594 KB)  ( 444 )
2260 An Automated Method to Fit Stellar Continuum Based on Statistic Windows
PAN Jing-chang1, WANG Xing-xing1, WEI Peng2, JIANG Bin1,2, TU Liang-ping2,3, LUO A-li1,2
DOI: 10.3964/j.issn.1000-0593(2012)08-2260-04
A novel statistic window based method to fit stellar continuum is proposed. First a stellar spectrum is divided into a series of statistic windows in which a certain percent of flux points is selected according to S/N ratio; then low order polynomial iteration fitting is carried out based on the selected flux points to obtain the stellar continuum. Experimental results show that the continuum obtained by the proposed method is more close to the real continuum, compared to other existed methods. This method has a better practical applicability and robustness to all kinds of spectra (except M-type spectrum) in SDSS. It also works well for Guoshoujing Telescope (LAMOST) pilot survey spectra.
2012 Vol. 32 (08): 2260-2263 [Abstract] ( 1337 ) PDF (2672 KB)  ( 552 )
2264 Lossless Compression of Hyperspectral Image for Space-Borne Application
LI Jin1,2, JIN Long-xu1, LI Guo-ning1
DOI: 10.3964/j.issn.1000-0593(2012)08-2264-06
In order to resolve the difficulty in hardware implementation, lower compression ratio and time consuming for the whole hyperspectral image lossless compression algorithm based on the prediction, transform, vector quantization and their combination, a hyperspectral image lossless compression algorithm for space-borne application was proposed in the present paper. Firstly, intra-band prediction is used only for the first image along the spectral line using a median predictor. And inter-band prediction is applied to other band images. A two-step and bidirectional prediction algorithm is proposed for the inter-band prediction. In the first step prediction, a bidirectional and second order predictor proposed is used to obtain a prediction reference value. And a improved LUT prediction algorithm proposed is used to obtain four values of LUT prediction. Then the final prediction is obtained through comparison between them and the prediction reference. Finally, the verification experiments for the compression algorithm proposed using compression system test equipment of XX-X space hyperspectral camera were carried out. The experiment results showed that compression system can be fast and stable work. The average compression ratio reached 3.05 bpp. Compared with traditional approaches, the proposed method could improve the average compression ratio by 0.14~2.94 bpp. They effectively improve the lossless compression ratio and solve the difficulty of hardware implementation of the whole wavelet-based compression scheme.
2012 Vol. 32 (08): 2264-2269 [Abstract] ( 1435 ) PDF (3341 KB)  ( 508 )
2270 EUV Flat Field Grating Spectrometer and Performance Measurement
DU Xue-wei1, SHEN Yong-cai2, LI Chao-yang1, AN Ning1, SHI Yue-jiang2, WANG Qiu-ping1*
DOI: 10.3964/j.issn.1000-0593(2012)08-2270-05
A high-resolution extreme ultraviolet (EUV) spectrometer has been developed to diagnose the magnetically confined plasmas. A holographic spherical varied line spacing concave grating which provides a flat focal plane is used as the diffraction element working with the grazing incidence angle of 3°. The nominal groove density is 1 200 lines·mm-1. A deeply cooled back-illuminated CCD camera is used as the spectra detector and a mechanical shutter is used to control the time of exposure. It covers the wavelength range of 5~50 nm with the CCD cameral moving along the spectra focal plane to cover different wavelength range interested. Spectrometer design is presented and it was tested by a Penning discharge light source. By the wavelength calibration, the actual parameters of the optical system were calculated and the wavelength accuracy is 0.003 nm. Results show that the spectral resolution is about 0.015 nm at 20 nm with the width of entrance slit opened at 30 μm, which agrees with the design goal.
2012 Vol. 32 (08): 2270-2274 [Abstract] ( 1369 ) PDF (2722 KB)  ( 574 )
2275 Design and Implementation of Real-Time Processing Platform for Movement Error Correction of Hyperspectrual Imaging
YU Tao1,2, HU Bing-liang1*, GAO Xiao-hui1,2, WEI Ru-yi1,2, JING Juan-juan1,2
DOI: 10.3964/j.issn.1000-0593(2012)08-2275-05
The approach that deals with compressed and packed image data transmitted from satellite to the ground is too slow for real-time application occasion, it also has huge image, multi-processing step and complexity recovery arithmetic synchronously, so it is urgent to build accurate and fast data processing platform for real-time processing. For the moment, the platform for data recovery and error correction is much less, the so-called successful platform may directly affect the effect of target detection and identification because of processing speed, precision, flexibility, configuration and upgrade. The platform we build is to set spatial modulation spectrometer as the research goal, We design and implement a hardware platform based on Xilinx Virtex-5 FPGA, It is combined with ISE IP soft-core resources which is configurable, high-precision and flexible by focusing on analyzing key aspects of the hardware platform. And the relevant test data were drawn, then a good way for spectrum recovery and error correction was explored.
2012 Vol. 32 (08): 2275-2279 [Abstract] ( 1459 ) PDF (2184 KB)  ( 488 )
2280 A Method of Precise Adjustment and Calibration for High-Resolution Echelle Spectrograph
CHEN Shao-jie1,2, CUI Ji-cheng1,2, LIU Yu-juan1,2, Bayanheshig1, TANG Yu-guo1
DOI: 10.3964/j.issn.1000-0593(2012)08-2280-06
Echelle spectrograph is a new type of high-resolution, high-precise spectrograph, and its resolution can be up to tens of thousands to hundreds of thousands. In this case, a little error of the structure will affect the resolution and precision greatly, so an accurate adjustment is of importance for the echelle spectrograph. According to the design features, the present paper discusses the adjustment method for echelle spectrograph. This is an uncomplicated, quick method, and adapts to mini, airproof structure of echelle spectrograph. Using this method, the actual state is consistent with the design result. The result of wavelength calibration is given out, and the error is less than 0.002 nm, which satisfies the requirement of the system.
2012 Vol. 32 (08): 2280-2285 [Abstract] ( 1384 ) PDF (1558 KB)  ( 528 )
2286 The Effects of Signal to Noise Ratio of Instrument and Number of Wavelengths on the Accuracy of Spectral Analysis
LI Gang1, ZHAO Zhe1, WANG Hui-quan1, LIN Ling1, WU Xiao-rong2, ZHANG Bao-ju2*
DOI: 10.3964/j.issn.1000-0593(2012)08-2286-04
In order to study the influence of the two factors, the signal to noise ratio (SNR) of instrument and number of wavelengths, on the accuracy of quantitative analysis in spectral modeling analysis, the influences of different SNRs, the number of wavelengths participating in partial least square regression, and multi-wavelength modeling in different SNR bands were taken into account. The relationships between these factors and quantitative analysis accuracy were explored by modeling analysis experiments. The results show that the analysis accuracy is directly related to the SNR of instrument. And increasing wavelengths, especial the ones with high SNR, reflects a phenomenon that four times of wavelength number will bring 2 times accuracy increasing, which can compensate for the lack of SNR. The research provides the experimental basis and theoretical guidance to improve the model’s quality and reduce the prediction error by the utilization and improvement of the instrument’s SNR and the reasonable choice of wavelengths and bands of modeling.
2012 Vol. 32 (08): 2286-2289 [Abstract] ( 1319 ) PDF (1612 KB)  ( 555 )
2290 The Analysis for Improving the SNR of Blood Components Noninvasive Measurement with DS Method
LI Gang1, WANG Hui-quan1, ZHAO Zhe1, LIN Ling1, ZHANG Bao-ju2, WU Xiao-rong2*
DOI: 10.3964/j.issn.1000-0593(2012)08-2290-05
In order to increase the accuracy of blood components measurement and enhance the stability of prediction model, the quantitative signal-noise-ratio (SNR) analysis of measuring instruments based on dynamic spectrum (DS) and preprocessing method was conducted. The SNR of DS is increased after adding boxcar integrator, decreasing wavelength revolution, balancing the DS’s SNR and excluding gross errors in preprocessing according to experiment results. Two volunteers were tested continuously for many times using the DS data acquiring system. The correlation coefficients of the each volunteer’s DS data was increased from 0.934 and 0.953 to 0.991 and 0.987, respectively. Moreover, the gap between the correlation coefficient of the same volunteer’s DS and different volunteers’ DS is increased too, which shows that the SNR can be improved by these methods. The quantitative SNR analysis can guide the way of choosing preprocessing method efficiently, which will create the condition for clinical application of the blood components noninvasive measurement.
2012 Vol. 32 (08): 2290-2294 [Abstract] ( 1245 ) PDF (2097 KB)  ( 570 )
2295 Motion Control of Moving Mirror Based on Fixed-Mirror Adjustment in FTIR Spectrometer
LI Zhong-bing, XU Xian-ze*, LE Yi, XU Feng-qiu, LI Jun-wei
DOI: 10.3964/j.issn.1000-0593(2012)08-2295-04
The performance of the uniform motion of the moving mirror, which is the only constant motion part in FTIR spectrometer, and the performance of the alignment of the fixed mirror play a key role in FTIR spectrometer, and affect the interference effect and the quality of the spectrogram and may restrict the precision and resolution of the instrument directly. The present article focuses on the research on the uniform motion of the moving mirror and the alignment of the fixed mirror. In order to improve the FTIR spectrometer, the maglev support system was designed for the moving mirror and the phase detection technology was adopted to adjust the tilt angle between the moving mirror and the fixed mirror. This paper also introduces an improved fuzzy PID control algorithm to get the accurate speed of the moving mirror and realize the control strategy from both hardware design and algorithm. The results show that the development of the moving mirror motion control system gets sufficient accuracy and real-time, which can ensure the uniform motion of the moving mirror and the alignment of the fixed mirror.
2012 Vol. 32 (08): 2295-2298 [Abstract] ( 1402 ) PDF (1525 KB)  ( 447 )
2299 Detection of Sorbic Acid in Food by Homemade Micro-Spectrometer Analytical System
CHUAN Na1, 2, XU Yi1, 2*, CHEN Gang1, 3, WEN Zhong-quan1, 3, HE Li1, 2, WEN Zhi-yu1, 3
DOI: 10.3964/j.issn.1000-0593(2012)08-2299-04
A homemade micro-spectrometer analytical system was developed for the quantitative determination of the sorbic acid in the food based on the photometric principle. And with the standard addition method it was applied to eliminate the interference coming from the food substrate. The detecting result illustrated a good relativity in the range of 0~10.0 mg·L-1 with the linear correlation coefficient of 0.998 9, and the sample recovery was 99.2%~99.5% with RSD of 0.58%. The micro-spectrometer analysis system has shown potential prospective application in the fields of rapid and high performance detection for food additives.
2012 Vol. 32 (08): 2299-2302 [Abstract] ( 646 ) PDF (1352 KB)  ( 501 )