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2005 Vol. 25, No. 08 Published: 2005-08-26

光谱学与光谱分析

	1169	热烈祝贺黄本立院士80华诞
		林俊越¹，宋增福²，王文书²

		2005 Vol. 25 (08): 1169-1170 [Abstract] ( 2037 ) PDF (446 KB) ( 329 )

	1171	Spectral Feature-Based Hyperspectral RS Image Retrieval
		DU Pei-jun^{1, 2}, CHEN Yun-hao^3*, FANG Tao², TANG Hong²
		Oriented to the demands of vast RS information management for RS image retrieval, the applications of spectral features are discussed by taking hyperspectral RS image as an example. It is proposed that spectral features-based retrieval includes two modes: retrieval based on point mask and polygon mask. The most key issues in retrieval are spectral features extraction and similarity measure. The spectral vector can be used to retrieval directly, and the spectral angle and spectral information divergence (SID) are effective in similarity measure. The local maximum and minimum in reflectance spectral curve, corresponding to reflectance apex and absorption apex, can be used to retrieval also, but effective matching strategy should be adopted. The quantitative indexes for spectral curves such as moment, fractal and entropy are not suitable to retrieval because of poor similarity measure performance.
		2005 Vol. 25 (08): 1171-1175 [Abstract] ( 1590 ) PDF (494 KB) ( 451 )

	1176	Time-Resolved Optoacoustic Technique and Its Applications to Noninvasive Monitoring of Biological Tissue
		SU Yi-xiong¹, WANG Rui-kang^{1, 2*}, XU Ke-xin³, ZHANG Fan¹, YAO Jian-quan¹
		Time-resolved optoacoustic technique offers a new ingredient in noninvasive monitoring of biological tissues.Due to the heterogeneous property of biotissue, different level of optical energy depositions generates different strength of the acoustic signal across the tissue.This makes it possible to probe the functional information tomographically inside the biological tissue.It becomes increasingly attractive as a hybrid non-invasive monitoring technique because it takes the advantages of high contrast feature delivered by the optical techniques and high penetration depth and resolution offered by the acoustical techniques.After a brief introduction of its theory, this paper reviews the state-of-the-art time-resolved optoacoustic methods that have been successfully applied in biomedicine, with a concentration on analytical monitoring and tomography.
		2005 Vol. 25 (08): 1176-1179 [Abstract] ( 2234 ) PDF (609 KB) ( 430 )

	1180	The Analysis of Error Sources for SAM and Its Improvement Algorithms
		TANG Hong¹, DU Pei-jun^1，2, FANG Tao¹, SHI Peng-fei¹
		Based on the analysis of the error sources for spectral angle mapping (SAM), several key elements are pointed out, i.e.the change of wave band location, the change of the attribution ratio, the random change of attribution, and the whole translation of wave band.After the above-mentioned four error sources are analyzed, the authors present several improvement algorithms, viz. calculating the spectral angle with grouping, normalization and intersection.The grouping method can resolve the pseudo-similar problem, because it considers both spectral global features and local features.Calculating spectral angle with normalization restrains those random errors in original data by normalizing the spectral vectors.The intersection method can eliminate the error elicited by the whole wave translation.Therefore, it can be employed to correctly identify spectral class.Experiments show that those improvement algorithms are effective and can be used to process spectral data with errors.
		2005 Vol. 25 (08): 1180-1183 [Abstract] ( 660 ) PDF (447 KB) ( 426 )

	1184	Electron Excitation Temperature of Argon Dielectric Barrier Discharge at Atmospheric Pressure
		DONG Li-fang^*, RAN Jun-xia, YIN Zeng-qian, MAO Zhi-guo
		The electron excitation temperature was measured by the intensity ratio of two spectral lines in argon dielectric barrier discharge (DBD) at atmospheric pressure.The spectral range is from 690 to 800 nm.It is shown that all of the spectral lines are attributed to neutral Ar atoms.The spectral line 763.51 nm(2P₆→1S₅) and 772.42 nm(2P₂→1S₃) are chosen to estimate the electron excitation temperature.The experimental results show that the electron excitation temperature is in the range of 0.1-0.5 eV.The electron excitation temperature increases with increasing applied voltage, but decreases with increasing gas flow rate.The electron excitation temperature in flowing Ar gas discharge is much different from that in static Ar gas discharge.The result is of great importance to industrial application of DBD.
		2005 Vol. 25 (08): 1184-1186 [Abstract] ( 1501 ) PDF (302 KB) ( 680 )

	1187	Energy Upconversion from Rare Earth Er Doped ZnF₂: PbF₄
		YUAN Fang-cheng
		Energy-upconversion meterials were produced by adding Er³⁺ and Yb³⁺ ions to lead fluoride, zirconium fluoride or zinc fluoride under specific conditions.Under the excitation of infrared light at 980 nm, the material samples emit relatively strong multi-band visible light, which comes into view by naked eyes.Based on the experiment, the multi-band visible spectral lines of Er³⁺ were analyzed, the energy level transition mechanism was given, and the effect of rare earth doping concentration on the energy upconversion efficiency was analyzed, according to the different upconversion light emitting intensity from samples with different Er³⁺ mol concentrations.
		2005 Vol. 25 (08): 1187-1189 [Abstract] ( 1067 ) PDF (333 KB) ( 364 )

	1190	Luminescence Properties of Gd₂O₃:Eu³⁺ Sol-Gel Thin Films
		GU Mu，QIU Long-qing，LIU Xiao-lin，ZHANG Rui，XU Xin
		In this paper, the sol-gel method with Re₂O₃(Re=Gd, Eu) as parent compounds was introduced to produce Gd₂O₃:Eu³⁺ thin films.From the luminescence intensities of the films doped with different Eu³⁺ concentration and annealed at different temperatures, it was found that the optimal dopant concentration and annealing procedure was 10% and 800 ℃ for 2 hours, respectively.By comparing the excitation spectra of the Gd₂O₃:Eu³⁺ film and powder, the authors found that the film has higher efficiency for energy transfer from host to dopant, which means that the film would be more suitable than the powder as a radio-luminescence material.In addition, it was first discovered that the luminescence of the film nearly disappeared after 2 hours annealing at 1 000 ℃.The phenomenon was explained with the results of SEM and XRD experiments.
		2005 Vol. 25 (08): 1190-1194 [Abstract] ( 1069 ) PDF (901 KB) ( 401 )

	1195	Influence of Different Sol-Gel System on the Luminescence of Nanocrystalline ZnO Powder
		GUO Shu-xia, ZHANG Xing-tang, ZHANG Zhong-suo, ZHAO Hui-ling, LI Yun-cai, HUANG Ya-bin, DU Zu-liang^*
		ZnO nanopowders were prepared by the sol-gel techniques with two kinds of solvent.Microstructure of powder samples was examined by XRD and TEM.The results indicate that the two ZnO samples have the same crystal and energy band structure.Their photoluminescence (PL) spectra in ultraviolet region are analogous, but their photoluminescence (PL) spectra in visible region are different.The reason is that the two kinds of solvent with different polarity result in the difference in configuration and distribution of the sample surface states in the two systems.
		2005 Vol. 25 (08): 1195-1198 [Abstract] ( 1066 ) PDF (454 KB) ( 413 )

	1199	Cooperative Luminescence in Yb:YAG Crystals
		MAO Yan-li¹，DING Fei¹，WANG Chang-shun¹，DENG Pei-zhen²，GAN Fu-xi²
		Cooperative luminescence phenomenon of Yb:YAG crystals was studied.Up-converted blue luminescence was obviously observed in Yb:YAG under excitation in the near-infrared region with a wavelength 940 nm.Experimental evidence was provided by the fact that the intensity of 498 nm luminescence shows a quadratic dependence on excitation power, and the intensity of blue luminescence increased with the increase in Yb ion concentration.It is concluded that this luminescence is due to a cooperative process resulting from a strong interaction of Yb ions.The cooperative luminescence is possiblely assigned to the strong interaction of 4f¹³ electrons and neighboring Yb³⁺ ions in a covalent host lattice such as YAG.Theoretical cooperative luminescence spectrum was calculated.
		2005 Vol. 25 (08): 1199-1202 [Abstract] ( 1237 ) PDF (454 KB) ( 412 )

	1203	Luminescence Properties of Rare Earth Ions in 2SrO·0.84 P₂O₅·0.16 B₂O₃: RE³⁺(RE=Ce，Tb)
		LIU Chun-tang, HE Da-wei^*, LI Shao-xia, LIU Duan-yang, LU Cheng-zhu
		The phosphors of 2SrO·0.84 P₂O₅·0.16 B₂O₃: RE³⁺(RE=Ce，Tb) were synthesized by high temperature solid state reaction.The luminescence properties of Ce³⁺, Tb³⁺ and the sensitization of Ce³⁺ to Tb³⁺ were studied.In the excitation spectrum of Ce³⁺, there are two broad bands at 232 and 296 nm respectively.Because of the large overlap between the emission bands, the authors could not separate them from each other.The authors could get two bands at 325 and 344 nm with the Gaussian fitting method.The possible reason is that these two peaks are from two light centers.In the phosphor of 2SrO ·0.84 P₂O₅·0.16 B₂O₃: Tb³⁺, the excitation spectrum of Tb³⁺ exhibits high absorption at 370 nm and emission spectrum shows the strongest emission peak at 548 nm.The emission from the levels of ⁵D₃ and ⁵D₄ of Tb³⁺ appear at the same time, indicating that non-radiative process between them is inefficient.In the phosphor of Ce³⁺ and Tb³⁺ co-doped 2SrO·0.84 P₂O₅·0.16 B₂O₃, efficient energy transfer exists.
		2005 Vol. 25 (08): 1203-1206 [Abstract] ( 1047 ) PDF (407 KB) ( 392 )

	1207	Influence of Novel Surface Treatment of ITO Anodes on the Performance of OLED
		WANG Li, ZHANG Xi-qing, LIN Peng, XIONG De-ping, HUANG Shi-hua
		The influences of surface treatments of indium-tin-oxide (ITO) anodes on the performance of OLED devices were investigated.This surface treatment is mechanical processes using a novel nanometer powder.Their surface morphology was measured by scanning using an AFM (atomic force microscope).The number and size of spike was reduced and regulation of ITO was enhanced; brightness and efficiency of devices were obviously increased.This novel way for ITO surface treatment by mechanical processes was proven to be effective.
		2005 Vol. 25 (08): 1207-1209 [Abstract] ( 1785 ) PDF (462 KB) ( 430 )

	1210	Determination of Genyamicin Sulfate in Injections by Flow-Injection Electrogenerated Chemiluminescence
		MA Hong-yan
		A new flow injection electrogenerated chemiluminescence (ECL) method for the determination of genyamicin sulfate was developed.The method is based on the sensitizing effect of genyamicin sulfate on the weak ECL signal of electrochemical oxidation of luminol on the platinum flake electrode in the medium of Na₂B₄O₇.The experimental conditions that influence the ECL intensity were investigated and optimized.Under the optimum conditions, the ECL response is in the range of 1.2×10^-9-4.0×10^-6 g·mL^-1 genyamicin sulfate with a detection limit of 8.0×10^-10 g·mL^-1.The relative standard deviation is 2.0%.This method was used to determine genyamicin sulfate in injection samples with satisfactory results.
		2005 Vol. 25 (08): 1210-1212 [Abstract] ( 1146 ) PDF (379 KB) ( 414 )

	1213	Determination of Uric Acid by Chemiluminescence
		LIU Er-bao^1*, WEI Hong-qing^1，2
		A novel chemiluminescence method for the determination of uric acid based on its inhibitory effect on the catalysis of Co²⁺ for the oxidation of luminol by H₂O₂ is described.The proposed method is simple, very sensitive and inexpensive.The decrease of chemiluminescence intensity is linearly correlated with uric acid concentration.The calibration graph is linear over the range of 1.0×10^-10-7.0×10^-6 mol·L^-1 and the detection limit is 1.1×10^-11 mol·L^-1.The relative standard deviation (RSD) for 5.0×10^-8 is 1.9%(n=4).The method has been successfully applied to the determination of uric acid in human urine and serum samples.
		2005 Vol. 25 (08): 1213-1215 [Abstract] ( 1748 ) PDF (367 KB) ( 388 )

	1216	FTIR Spectroscopic Study on the Stress Effect of Compositions of Macromolecular Structure in Tectonically Deformed Coals
		JU Yi-wen^{1, 2}, JIANG Bo², HOU Quan-lin¹, WANG Gui-liang²
		Fourier transform infrared spectroscopy (FTIR) was applied to the study of the stress effect of compositions of macromolecular structure in tectonically deformed coals.The results showed that in different kinds of tectonically deformed coals, the absorption band of aromatic structure, aliphatic structure and oxygen functional groups nearly consistent in the peak wave number，but the intensity of the peak is different which is justly influenced by different deformation degree and deformation mechanism of tectonically deformed coals under tectonic stress.In the metamorphic and deformed environments of the low，middle and high coal rank, for tectonically deformed coals, with the increasing stress, hydrogen-enriched degree and oxygen-enriched degree decrease, while the degree of ring condensation increases.But there are differences in the change of compositions contents of macromolecular structure.This might indicate that the FTIR could be used in the stress effect of compositions of macromolecular structure in tectonically deformed coals.
		2005 Vol. 25 (08): 1216-1220 [Abstract] ( 1783 ) PDF (723 KB) ( 566 )

	1221	Absorption Line Intensities of Phosphine in the Regions 1 950-2 480 cm^-1 and 3 280-3 580 cm^-1 Studied by Fourier-Transform Spectroscopy
		WANG Le, CHEN Ping, CHENG Guo-sheng, DING Yun, HU Shui-ming^*
		The data of line intensities of the fundamental and low overtone absorption bands of phosphine are the basic reference data for the applications in quantative analysis and astronomy.The method of high-resolution Fourier-transform spectroscopy study on the absorption line intensities is discussed.With a series of measurement and fitting the line profiles, altogether 1 760 absorption lines intensities of phosphine were obtained, corresponding to five bands in the 1 950-2 480 cm^-1region and four bands in the 3 280-3 580cm^-1 region.The accuracy of the line intensities was estimated to be ±6%.
		2005 Vol. 25 (08): 1221-1226 [Abstract] ( 1083 ) PDF (493 KB) ( 410 )

	1227	Study on the Application for Near-Infrared Spectroscopy Quantitative Analysis and Selecting Optimum Wavelength by the MAXR Regression Procedure
		ZHANG Lu-da¹，ZHAO Li-li²，ZHAO Long-lian^２，LI Jun-hui^２，YAN Yan-lu^２
		This paper introduces the principle and method with which the model about the quantitative analysis of Fourier transformation near infrared (NIR) spectroscopy by MAXR regression procedure can be established.In this way, the authors have selected the wave length information by Matlab language design programming in order to establish the quantitative analysis models with near infrared spectroscopy.Taking sixty-six wheat samples as experiment materials, quantitative analysis models to determine protein content are established with thirty-three samples.The relative coefficient are 0.977 1 and 0.976 5 respectively and the standard error are 0.335 and 0.340 between the predication result of the two models which include respectively two or three wave length information and Kjeldahl’s value for the protein content of the another thirty-three wheat samples.When selecting the wave length information, the MAXR regression procedure can establish the optimum regression models which contain 1 or 2 … or k wavelength information respectively.MAXR regression procedure is a useful method when selecting the optimum wavelength information because of its shorter computation time, and the method not only can carefully select the essential wavelength information to establish NIR spectroscopy quantitative analysis models of resisting multicollinearity information disturbance, but also to establish the work for selecting optimum wavelength information which can direct to design the special NIR analysis instrument for analyzing specific component in the special samples.
		2005 Vol. 25 (08): 1227-1229 [Abstract] ( 1098 ) PDF (328 KB) ( 411 )

	1230	Studies on ANN Models of Determination of Tea Polyphenol and Amylose in Tea by Near-Infrared Spectroscopy
		LUO Yi-fan^{1, 2}, GUO Zhen-fei³, ZHU Zhen-yu⁴, WANG Chuan-pi¹, JIANG He-yuan¹, HAN Bao-yu^1*
		The objectives of the present paper were to build the models for the determination of tea polyphenol (TP) and tea amylose (TA) in tea by near-infrared spectroscopy (NIR).According to the range of 7 432.3-6 155.7 cm^-1 and 5 484.6-4 192.5 cm^-1 of NIR spectra, the models are built for determining the contents of TP and TA in tea with the input layer, hidden layer and node ((8，4，1) and (7，5，1) respectively) in network structure by the artificial neural network.The correlation coefficient (ｒ), the root mean square error of cross validation (RMSECV) and the root mean square error of prediction (RMSEP) were selected as the indexes for evaluating the performance of calibration models.The results show that ｒ, RMSECV and RSECV by the model samples for TP and TA are 0.984 7，0.460 and 0.123，and 0.947 0，0.136 and 0.224 respectively，and ｒ, RMSEP and RSEP by the prediction samples for TP and TA are 0.980 4，0.529 and 0.017, and 0.968 2，0.111 and 0.029 8 respectively.These indicated that the NIR-ANN models can be used to determine the contents of TP and TA in tea.
		2005 Vol. 25 (08): 1230-1233 [Abstract] ( 522 ) PDF (471 KB) ( 455 )

	1234	Analysis of Reflective IR Transmittance Spectra at Oblique Incidence of Micrometer SiO₂ Films on c-Si Substrate
		YU Yun-peng, LIN Shun-hui, LIN Xuan-ying, LIN Kui-xun
		The reflective infrared transmittance spectra at oblique incidence of SiO₂ films deposited on c-Si wafer have been measured.The thickness of the films was micrometer quantity.The spectra showed many differences from the common transmittance (or absorption) spectra in the range of 900-1 250 cm^-1.The reflectivity peak at 1 100 cm^-1 was found and its position was essentially fixed.With the thickness increased， the drop of peak at 1 100 cm^-1 and hollow at 1 200 cm^-1 became gradually slow.As the thickness increased to be over 2 micrometers, the shape of the spectra in 1 075-1 250 cm^-1 did not change obviously.The analysis showed that the measured spectrum was composed of reflectivity spectrum and absorption spectrum of the SiO₂ film, which occurred at Air/SiO₂ interface and SiO₂ layer respectively.When the thickness was over one micrometer and the film had considerable absorption, the contribution from reflectivity spectrum became very obvious.So the absorption is not the only factor in the analysis of these spectra.
		2005 Vol. 25 (08): 1234-1236 [Abstract] ( 1522 ) PDF (419 KB) ( 366 )

	1237	IR Study of the Hardening and Maturation of Glass Ionomer Cement
		CHENG Han-ting¹, LIU Han-xing^1*, XIAO Qun²
		The set reaction of glass ionomer cement has been investigated by means of IR spectra.It has been found that the band intensity around 1 413 cm^-1 due to the vibration of polyacrylate salt increased with aging, and the shoulder band at 950 cm^-1 due to the stretching vibration of Si—OH still appeared during the periods studied.The results are consistent with that of mechanical determination of compressive strength, which suggested that the crosslink density increase resulting from the slow diffusion of Ca²⁺ and Al³⁺ is responsible for compressive strength increasing with aging, and forming and maturing of interface layer comprising of silica gel also have a significant effect on the properties of glass ionomer cements.
		2005 Vol. 25 (08): 1237-1239 [Abstract] ( 1424 ) PDF (510 KB) ( 370 )

	1240	Application of IR Spectra to the Study of Comprehensive Utilization of Fly Ash
		WANG Li-hua^1，3，WANG Dong-sheng²
		Infrared (IR) spectra were used to study the fly ash both before and after having been treated by using sodium carbonate at 860 ℃ for 1.5 h.The IR results show that fly ash is composed of mullite and silica, which change into nepheline after being heated with sodium carbonate.According to these IR curves, different sodium carbonate amount makes the products different.For example, as fly ash∶sodium carbonate ＞1.2∶1, the product is mainly nepheline with some mullite left.However, when increasing the use of sodium carbonate to the range of fly ash∶sodium carbonate ＜1.2∶1, the mullite phase disappears, while some sodium carbonate remains; and the structure of nepheline has little change.So the authors choose fly ash∶sodium carbonate =1.2∶1 as the best choice of the sodium carbonate amount factor.X-ray diffraction (XRD) analysis results of the same sample came to the same conclusion.
		2005 Vol. 25 (08): 1240-1242 [Abstract] ( 1662 ) PDF (395 KB) ( 427 )

	1243	Near Infrared Determination of the Content of Caffeine in Tea Polyphenol
		LU Yong-jun¹, CHEN Hua-cai^{1, 2}, Lü Jin², CHEN Xing-dan¹
		In the present paper the caffeine in the tea polyphenol was analysed spectrally and quantitatively by using near infrared spectroscopy.From the original absorbance of caffeine in the tea polyphenol an obvious and strong peak can be viewed.By using second derivative, MSC(multiple scatter correction) and correlation analysis the spectral characteristics of caffeine in the near infrared region can be seen very clearly, thus the robust calibration model can be set up easily.The result obtained shows that through this technique the absorptive characteristic of those primary fundamentals of caffeine can be looked through easily, meanwhile, calibration test was performed to quantitatively measure the weight percent of caffeine in the tea polyphenol, and fine precision of the result was obtained in a comparatively very large range of concentration.The SEC(standard error of calibration) is 0.49%, and the correlation coefficient r is 0.993.The result shows that NIR is feasible and superior in analyzing the content of caffeine in tea polyphenol.
		2005 Vol. 25 (08): 1243-1245 [Abstract] ( 1432 ) PDF (400 KB) ( 537 )

	1246	Identification of Soybean Varieties by Direct Determination of FTIR Spectrum
		HONG Qing-hong^1，2，LI Dan-ting²，HAO Chao-yun²
		The spectra of cotyledons and outer layer parts of skins of eight kinds of soybeans were determined by FTIR spectrometry with OMNI-sampler directly, fast and accurately.The absorption peaks of the spectra were analyzed.Results from the comparison of the spectra showed some differences in the intensity and the shape of absorption peaks of their FTIR spectra, especially in the range of 1 800-1 200 cm^-1, which mainly reflected the substituent nature of amideⅠand Ⅱ of protein.The major differences of spectra in this region might result from the differences in genes.So FTIR spectra could be used for the identification of soybean varieties.
		2005 Vol. 25 (08): 1246-1249 [Abstract] ( 619 ) PDF (477 KB) ( 489 )

	1250	Study on the Comet-Tail System of ¹²C¹⁶O⁺ in the Near-Infrared Region
		LI Wei¹, YANG Xiao-hua¹, GAN Yu-jie¹, WU Ling², GUO Ying-chun¹, LIU Yu-yan¹, CHEN Yang-qin^1*
		The molecular cation CO⁺ is a very important transient molecular radical, and the spectra of the ion has been investigated by numerous researchers.Optical-heterodyne-magnetic-rotation-enhanced velocity modulation spectroscopy(OH-MR-VMS) was employed to measure the comet-tail system (A²Π_i-X²Σ⁺) of ¹²C¹⁶O⁺ molecular ion.The vibrational rotation absorption spectra were observed in the near-infrared region, including three bands of (0，3)，(1，4)and(3，6).A set of precise molecular constants for the A²Π_i(ν′＝0，1，3) were determined using the least-squares fit.This experiment has further proved that OH-MR-VMS is very valuable in measuring absorption spectra of molecular ions.
		2005 Vol. 25 (08): 1250-1252 [Abstract] ( 1605 ) PDF (377 KB) ( 424 )

	1253	Infrared Spectra and Coordinated Mode of Manganese(Ⅱ)，Iron(Ⅱ)，Cobalt(Ⅱ) Complexes with Dithiolene and 1, 10-Phenanthroline-5, 6- Dione Ligands
		PAN Qing-cai¹，ZHAO Yong-he¹，PENG Zheng-he²
		The infrared spectra and far-infrared spectra of M(mnt)(phen-5，6-dione) [M=Manganese(Ⅱ), Iron(Ⅱ), Cobalt(Ⅱ).mnt^2-=1, 2-dicyano-1, 2-ethylenedithiolate or maleonitriledithiolate，phen-5，6-dione＝1, 10-phenanthroline-5，6-dione] are reported in detail.In infrared spectra and far-infrared, characteristic ν_(CN)，ν_(CO)，ν_(CC)，ν_(CN)，ν_(C—S)，ν_(M—S) and ν_(M—N) are very strong.Far-infrared spectra shows that M—S bond is slightly strong than M—N bond.Through comparing infrared spectra, simple regular coordinate mode of M(mnt)(phen-5，6-dione) is analysed.The relation between infrared spectra and structure of the title complexes is discussed.In the title complexes, transition metals ion with 1, 2-dicyano-1, 2-ethylenedithiolate and 1, 10-phenanthroline-5，6-dione form quadridentate distortion tetrahedral configuration molecules.The symmetry is approximate to C₂ and C_2V.
		2005 Vol. 25 (08): 1253-1256 [Abstract] ( 1609 ) PDF (362 KB) ( 411 )

	1257	The Study of Raman Spectra for Ethanol under the Pressures of 0.1-900 MPa at 24 ℃
		YANG Jing-feng¹, ZHENG Hai-fei¹, LI Wen-xia²
		Experimental measurement and study of Raman spectra for pure ethanol and 50% ethanol aqueous solution has been conducted at ambient temperature and the pressures of 0.1-900 MPa by using Cubic Zirconia anvil cell.The result shows that the frequency of C—H stretch vibration increases with increasing pressure and each of their relation between the frequency and pressure can be expressed as following: for pure ethanol： ν₁=2 881.890+0.001 27 P+6.213×10^-6 P²;ν₂=2 928.707+0.004 38 P+4.772×10^-6 P²;ν₃=2973.457+0.008 89 P+3.245×10^-6 P²;for 50% ethanol aqueous solution： ν₁ =2 885.616+0.010 8 P-2.699×10^-6 P²;ν₂ =2 932.734+0.013 7 P-3.346×10^-6 P²;ν₃ =2 978.115+0.016 5 P-4.914×10^-6 P².Furthermore, the authors have observed that at the pressure lower than 550 MPa, the strength of hydrogen bonding becomes stronger with increasing pressure.
		2005 Vol. 25 (08): 1257-1261 [Abstract] ( 1508 ) PDF (459 KB) ( 377 )

	1262	Spectroscopy Research on the Origin Mechanism for Light Induced Delayed Fluorescence of Chloroplast
		WANG Cheng-long¹, MA Guo-xin^{1, 2}，FAN Duo-wang¹, XIA Rong-bin¹
		Research of the mechanism for delayed fluorescence origin play an important role in the application of DF.Based on the charge recombination theory, the mechanism for delayed fluorescence origin is theoretically analyzed in this paper.The decay kinetics of DF, depending on the backward transport electron and oxidized state P680⁺, can be well fitted by poly-exponent.The relative fast component of DF originates from the Z⁺P680 Q^-_A states, generated during the previous period of the sample illumination.On the other hand, the slow component of DF is ascribed to the state Q⁼_B—the next electron carrier of deoxidized side in PSⅡ.Meanwhile, the experimental results confirmed the theoretical conclusion.Furthermore, the authors testified that the third component with lifetime much greater than the time of the registration period (which is presented as a constant), is corresponds to the recombination of P680⁺ and the backward transport electron from PSⅠ.
		2005 Vol. 25 (08): 1262-1265 [Abstract] ( 1134 ) PDF (454 KB) ( 390 )

	1266	Study of Achieving White Organic LED by Fluorescence Dye
		WANG Jin, WANG Jing^*, ZHENG Rong-er, MENG Ji-wu
		Some hybrid organic LEDs are made by using fluorescence dye and InGaN blue-light chip and the possibility of achieving white organic LED is invesgated according to light conversion theory.Firstly, the LEDs made by normal method and double-dotting glue method are studied.It is found that the double-dotting glue method is too complex and the LEDs made by this way is low-luminance, so it isn’t fit to make LED.Secondly the different weight ratio of 1/1/100, 1/1/200, 2/1.5/100 ax-17/zq-13/AB LEDs are manufactured.The 2/1.5/100 LED’s color coordinate is(0.32, 0.30), approaching to white point and the correlative color temperature is 6290K which is close to sunlight.So it is a relatively ideal white lamp-house.
		2005 Vol. 25 (08): 1266-1269 [Abstract] ( 1102 ) PDF (417 KB) ( 403 )

	1270	Effect of Aggregation Extent of Microperoxidase-8 on Its Interaction with La³⁺
		CHEN Ting-ting¹, HUANG Xiao-hua¹, DU Jiang-yan¹, FENG Yu-ying¹, LIU Chang-peng², XING Wei¹, LU Tian-hong^{1, 2*}
		The results of UV-Vis absorption spectroscopic investigation indicated that La³⁺ coordinates strongly with carboxylate oxygen of two propionic acid groups of the heme group in an MP-8 molecule, leading to an increase in the non-planarity of the porphyrin ring of the heme group.The increasing extent in the non-planarity of the porphyrin ring of the heme group due to the interaction of La³⁺ and MP-8 molecule would be significantly decreased because NaCl could increase the aggregation extent of MP-8 molecules.Although methanol can reduce the aggregation extent of MP-8 molecules, it has little influence on the increasing extent in the non-planarity of the porphyrin ring of the heme group due to the interaction of La³⁺ and MP-8 molecule.
		2005 Vol. 25 (08): 1270-1273 [Abstract] ( 519 ) PDF (429 KB) ( 402 )

	1274	Thermodynamics Studies on the Reaction Characteristics of Hemoporphyrin with Human Serum Albumin
		ZHANG Yong^*, YAN Xin-liang, LEI Ya-chun, SHEN Xiao-fang, PAN Jing-hao, LIU Dian-sheng
		The quenching reaction of hemoporphyrin with human serum albumin(HSA) was studied by using fluorescence spectra and absorption spectra.The formation constants of them were analyzed at different temperature according to Stern-Volmer equation and double-reciprocal equation, which are smaller at high temperature than at low temperature.The binding site was calculated (r=4.36) by Fster energy transfer mechanism, and the thermodynamic parameters were obtained.H-bond and Van der Waals are two main reactions between HP and HSA.
		2005 Vol. 25 (08): 1274-1276 [Abstract] ( 1349 ) PDF (399 KB) ( 391 )

	1277	Study on the Interaction of Tetraiodofluorescein and Bovine Serum Albumin by Fluorimetry
		LI Gai-xian,LI Jian-qing,WEI Yu-xia, DONG Chuan^*
		The binding reaction of tetraiodofluorescein with bovine serum albumin in aqueous solution was studied by fluorimetry.The binding constant is 2.65×10⁵ L·mol^-1，the equilibrium constant is 5.7×10⁴ L·mol^-1, and the binding number is 0.86.The research results of binding model indicate that the hydrophobic force was the main binding force.The presence of BSA can increase the fluorescence intensity of TIF.And the ΔF(F-F₀) is linear to the concentration of BSA in a certain range, so the first analytical application was proposed.The linear dynamic range (LDR) was 8×10^-7-9×10^-6 mol·L^-1, the limit of detection(LOD) was 9.88×10^-8 mol·L^-1, and the relative standard deviation(RSD) was 3.4%.
		2005 Vol. 25 (08): 1277-1280 [Abstract] ( 1562 ) PDF (472 KB) ( 398 )

	1281	Interaction of Cucurbit[n]urils and Quinoline or Its Derivates
		DU Ying^{1, 2}, XUE Sai-feng^1*，MU Lan¹, ZHU Qian-jiang¹，TAO Zhu¹，ZHANG Jian-xin³
		The structures and fluorescence characteristics of cucurbit[n=6-8]urils with quinoline, isoquinoline and 7-methyl quinoline have been investigated by fluorescence spectrophotometry.Compared to NMR techniques, the fluorometric analysis method revealed that there are not only obvious interactions of quinoline or its derivates and cucurbit[7]uril, but also interactions of quinoline or its derivates and cucurbit[6]uril or cucurbit[8]uril which can not be observed by using ¹H NMR technique.The experimental results also revealed that quinoline, isoquinoline and 7-methyl quinoline were included by cucurbit[6-8]uril with different ratios.There could be three kinds of interactions of cucurbit[n]urils and the guests: a) cavity interaction, including hydrophobic forces and Van der Waals contact forces between macrocycles and cages; b) portals ion-dipole interaction, or electrostatic interaction of the positive charge of the guests and the carbonyl groups at the portals of cucurbit[n]uril; c)size interaction which requires the size of the guest matching a cucurbit[n]uril.
		2005 Vol. 25 (08): 1281-1285 [Abstract] ( 2506 ) PDF (648 KB) ( 419 )

	1286	Resonance-Scattering Spectral Determination of H₂O₂ Using Rhodamine 6G Association Particles
		LI Zhen-zhong¹，JIANG Zhi-liang^1*，YANG Guang¹，LU Dan¹，LIU Shao-pu²
		Under the conditions of 0.02 mol·L^-1 HCl-4.0×10^-4 mol·L^-1 KI-1.6×10^-5 mol·L^-1 Mo(Ⅵ), there is a fluorescence peak at 540 nm and a synchronous fluorescence peak at 540 nm for Rhodamine 6G (RhG).When there exists H₂O₂, it reacts with I^- to form I^-₃.RhG and I^-₃ combine to form an ion association particle.The particles exhibit three resonance scattering peaks at 320 nm, 400 and 595 nm respectively.And there is fluorescence quenching at 540 nm.H₂O₂ concentration in the range of 0.068-34 μg·mL^-1 is proportional to the resonance scattering peak at 400 nm.And a new resonance scattering spectral method has been described for the determination of H₂O₂ in water samples.The spectral results have verified that the formation of (RhG-I₃)_n association particles and the interface are the main factor that causes the fluorescence quenching and resonance scattering effects.
		2005 Vol. 25 (08): 1286-1288 [Abstract] ( 1654 ) PDF (371 KB) ( 392 )

	1289	Resonance Light Scattering of 4-(2-Pyridylazo)-Resorcinol (PAR)
		WEI Yong-ju¹, QI Xiu-ju², DUN Hui-juan¹, WANG Hui-ying¹, LAN Rui-jia¹
		Mechanism and influence factors of resonance light scattering (RLS) spectra of 4-(2-pyridylazo)-resorcinol (PAR) aqueous solution were studied.In weak acidic solutions, strong RLS of PAR can be observed.The spectral feature of RLS is related to the absorption spectra of PAR.Acidity of the solutions influenced the acid-base equilibrium of PAR and its existing state, thereby influenced the RLS intensity.At pH 3.1 to pH 6.2, PAR exists as neutral molecule, which may assemble into molecular aggregates by hydrophobic force giving a light scattering enhancement.By a light polarization experiment, the RLS of PAR was demonstrated to be complete polarized light.The relationship between RLS intensity and PAR concentration was examined to be linear at a given set of experimental conditions.
		2005 Vol. 25 (08): 1289-1292 [Abstract] ( 1095 ) PDF (460 KB) ( 417 )

	1293	Studies on Relics Conservation by Diffuse Reflectance Spectroscopy
		WANG Li-qin^{1, 2}，LIANG Guo-zheng¹，DANG Gao-chao^3*, WANG Fang⁴
		A diffuse reflectance spectroscopic method was developed to investigate relics conservation with a self-made fiber optics reflectance spectrophotometer.With this technique(1) identifying pigments on the color relics was done by comparing the shapes of reflectance spectra and the positions of reflectance peaks or first derivative peaks with those of related standard pigments; (2) changes of surface states of metals were monitored.From the investigation on the reflectance spectra of copper and its rust product, we can easily get some information about the metal surface, so diffuse reflectance spectroscopy shows special function in the research on metal surface; (3) the diffuse reflectance spectroscopic characteristics of the materials used in protection and restoration of cultural heritages were studied, which can help us choose proper protecting and restoring materials.From our studies it was verified that diffuse reflectance spectroscopy is a quick, simple and non-destructive analytical technique.The study makes diffuse reflectance spectroscopy a new means for relic protection, and opens a new application area for diffuse reflectance spectroscopy as well.
		2005 Vol. 25 (08): 1293-1296 [Abstract] ( 1942 ) PDF (512 KB) ( 427 )

	1297	Study on the Spectral Properties of a New Fluorene Derivative
		MA Wen-bo^1*，WU Yi-qun^{1, 2}，GU Dong-hong¹，GAN Fu-xi¹
		A new big π-conjugated, symmetrical fluorene derivative, 9,9-bis(2-ethylhexyl)-2,7-bis(2-(4-methoxy) benzene-2,1-ethenyl) fluorene (abbreviated as MO-Flu-MO) was synthesized and characterized by elemental analysis, mass spectral, UV-Vis and IR spectral.Spectral characteristics of this compound, including linear absorption spectral and one-photon fluorescence spectral, were measured in acetonitrile, methylene chloride, tetrahydrofuran and hexane at room temperature.It was found that solvent effects have different influence on absorption spectral and fluorescence spectral, major reasons of such spectral behavior are discussed.
		2005 Vol. 25 (08): 1297-1300 [Abstract] ( 1157 ) PDF (448 KB) ( 368 )

	1301	Interaction between Bovine Serum Albumin and Umbelliferone with/without Metal Ions of Cu²⁺ or Zn²⁺
		LIU Xue-feng, XIA Yong-mei, FANG Yun^*, ZOU Lu, LIU Ling-ling
		The interaction between bovine serum albumin (BSA) and umbelliferone, an active component of Chinese herbs, with or without metal ions was investigated using fluorescence spectroscopy (FS) and UV.The experimental results showed that the umbelliferone molecules inserted into the hydrophobic pockets of BSA and quenched the intrinsic fluorescence of BSA by forming umbelliferone-BSA complex.The mechanism of fluorescence quenching was confirmed combining by both static quenching and nonradiative energy transferring.It was discovered that the apparent association constant (K_A) increases in the presence of Cu²⁺ and Zn²⁺, whereas the spatial-distance (r) between umbelliferone molecule and fluorescent amino acid residues of the BSA and the binding sites (n) of umbelliferone molecules on BSA have no obviously change.Binding of umbelliferone molecules to BSA was a spontaneous supramolecular interaction in which entropy increased and Gibbs free energy decreaed.The interaction of the umbelliferone-BSA was driven mainly by electrostatic force which was enhanced by Cu²⁺ and Zn²⁺, thus the contribution of ΔH to ΔG increased in the presence of metal ions.
		2005 Vol. 25 (08): 1301-1305 [Abstract] ( 1092 ) PDF (579 KB) ( 409 )

	1306	Study on Interaction between CT-DNA and Cytochrome C Using UV-Vis Spectroscopy and Electrochemistry
		ZHOU Jia-hong¹, FENG Yu-ying¹, WU Xiao-hong²，YANG Hui², XING Wei³, LU Tian-hong^{2, 3*}
		The interaction between CT-DNA immobilized on the positively charged nylon membrane and cytochrome C was studied using UV-Vis reflectance absorption spectroscopy and electrochemistry.It was found that cytchrome C can be adsorbed on the negative charged CT-DNA surface with the active positive charge area.Therefore, CT-DNA can promote the direct electrochemical reaction of cytochrome C.
		2005 Vol. 25 (08): 1306-1308 [Abstract] ( 1016 ) PDF (315 KB) ( 409 )

	1309	Investigation of TiO₂ Photocatalytic Degradation of Bovine Serum Albumin
		YANG Gui-qin, LI Zhao-hui^,LIN Zhang-xiang, WANG Xu-xu, LIU Ping,FU Xian-zhi^
		The present paper reports photocatalytic degradation of bovine serum albumin (BSA) by TiO₂ under near UV(365 nm) irradiation.Ultraviolet-Visible spectrometry, FTIR spectrometry and HPLC were used to study the degradation and characterize the final degradation products.It was found that under near UV irradiation, BSA (0.1 g·L^-1) can be totally degraded to small fragments by TiO₂ in 5 h.Total mineralization of BSA (93.5%) is reached after reacting for 40 h.C, N and S in BSA are mineralized to give CO₂, NO^-₃ and SO^２-₄.It is suggested that the degradation of BSA happens in two steps: first to small fragments, then further mineralized to small inorganic molecule.The absence of UV irradiation or TiO₂ can only lead to partial degradation of BSA (30%) in 5 h and no CO₂ is observed even in longer reaction time.
		2005 Vol. 25 (08): 1309-1311 [Abstract] ( 283 ) PDF (422 KB) ( 389 )

	1312	Research Development of Catalytic-Kinetic Spectrophotometric Determination of Trace Manganese
		ZHENG Huai-li^1，4，YAO Bing-hua²，YAO Jia-fei³, LI Hong⁴
		A review of recent research progresses in the determination of trace amount of manganese with catalytic-kinetic spectrophotometric method is presented and discussed in the present paper.Firstly, by comparison it is showed that catalytic-kinetic spectrophotometry has more advantages than atomic absorption spectrophotometry and extraction-spectrophotometry for the determination of trace amounts of manganese.The review and discussion of the recent research developments in the catalytic discoloring spectrophotometry and catalytic coloring spectrophotometry for the determination of trace amounts of manganese are given respectively.Finally the development trends and application perspectives for the catalytic-kinetic spectrophotometry in the future are discussed and probed.Twenty five references are cited.
		2005 Vol. 25 (08): 1312-1314 [Abstract] ( 1121 ) PDF (407 KB) ( 401 )

	1315	Determination of Trace Manganese by Non-Organic Solvents Extraction Catalytic Spectrophotometry in Mn(Ⅱ)-H₂O₂-EBT-PEG-2000 System
		SUN Deng-ming,FANG Hua-cai
		A new non-organic solvents extraction catalytic spectrophotometric method for the determination of trace amounts of manganese was studied.The method is based on the manganese(Ⅱ) catalyzing hydrogen peroxide to oxidate of eriochrome black T in hydroxide-ammonium chloride buffer medium.The reaction time and the degree of indicating reaction are controlled by non-organic solvents extraction equilibrium using polyethylene glycol-2000.The absorbance of polyethylene glycol-2000 phase is measured at 539 nm in weak acidic medium.The calibration graph is linear for 0.008 0-0.55 μg· mL^-1 Mn(Ⅱ), and the detection limit is 3.0×10^-9 g·L^-1.The method can be applied to the determination of trace manganese in tea and aluminum alloy with satisfactory results.
		2005 Vol. 25 (08): 1315-1317 [Abstract] ( 1110 ) PDF (380 KB) ( 397 )

	1318	Highly Sensitive Spectrofluorimetric Determination of Trace Amounts of Nitrite with N-(1-Naphthyl) Ethylenediamine

		A simple and sensitive fluorescence quenching method for the determination of trace nitrite was developed.The method is based on the reaction of NED with nitrite in acidic medium to form a new compound, which has weak fluorescence.The linear range was 1.07-214.0 μg·L^-1 with a 3σ detection limit of 0.069 μg·L^-1 under the optimum experimental conditions.This proposed method has been applied to the determination of trace amounts of NO^-₂ in tap water and lake water without extraction.
		2005 Vol. 25 (08): 1318-1321 [Abstract] ( 592 ) PDF (479 KB) ( 402 )

	1322	Fading Spectrophotometric Determination of Heparin with Brilliant Cresyl Blue
		SUN Wei^1,2, JIAO Kui¹, NIU Xue-liang¹, LU Lu-de²
		A new fading spectrophotometric method for determining trace heparin is proposed in the present paper.In pH 3.0 Britton-Robinson (B-R) buffer solution, brilliant cresyl blue can react with heparin resulting in the decrease of absorbance of BCB at 592 nm.The conditions for the interaction were optimized, and the interferences of coexisting substances were investigated.Under the optimal conditions the reduction of the absorbance is proportional to the concentration of heparin in the range of 0.6-6.0 mg·L^-1 with the detection limit of 0.173 mg·L^-1.The molar absorptivity of the method was calculated to be 1.03×10⁶ L·mol^-1·cm^-1.The method has been applied to determine the heparin sodium injection solution with satisfactory results.
		2005 Vol. 25 (08): 1322-1324 [Abstract] ( 1469 ) PDF (371 KB) ( 359 )

	1325	Determination of Eu in Long-Aferglow of the SrAl₂O₄:Eu²⁺, Dy³⁺ Phospher Samples by LMESA
		ZHANG Jin-ping, ZHANG Bo, GUO Qing-lin, WANG Wen-jie, GUO Zhi, HUAI Su-fang, WEI Yan-hong
		A method for the determination of Eu in Long-aferglow of the SrAl₂O₄:Eu²⁺, Dy³⁺ phospher samples by laser microemission spectral analysis was developed.And the accuracy of this method was studied.Analyses of Eu in Long-aferglow of the SrAl₂O₄:Eu²⁺, Dy³⁺ phospher samples, using the Eu(Ⅱ) line at 412.973 nm, show that RSD of relative intensity of spectral lines is 4.3%, RSD of quantitative analysis is 7.4%, the average of quantitative analysis is 2.13%.Compared with the content before samples synthesized, it can be concluded that the content of Eu in the SrAl₂O₄:Eu²⁺, Dy³⁺ phospher samples synthesized by high temperature solid phase reaction has an obvious increase.
		2005 Vol. 25 (08): 1325-1327 [Abstract] ( 1138 ) PDF (361 KB) ( 384 )

	1328	Fabrication of Relative Humidity Optical Fiber Sensor Based on Nafion-Crystal Violet Sensing Film
		JIN Xing-liang^{1, 2}, LI Wei¹, SUN Da-hai¹, ZHUANG Zhi-xia¹, WANG Xiao-ru^1*
		With two kinds of sensing methods for relative humidity based on fluorescence and visible absorption respectively, crystal violet was opted as the molecule probe for humidity.The optical chemical sensing film for humidity was prepared when crystal violet was embedded in the Nafion gel.The relative humidity sensor was fabricated after the sensing film had been coupled with other components, such as optical fiber and detector, which possessed short response time (<2 min), high sensitivity (≤5% RH), wide dynamic range (30%-100%) and good reversibility (RSD≤2.6%) for relative humidity at 640 nm wavelength.
		2005 Vol. 25 (08): 1328-1331 [Abstract] ( 1136 ) PDF (533 KB) ( 410 )

	1332	Spectral Signal Recognition Based on Wavelet Packet Analysis
		XIONG Yu-hong¹, WEN Zhi-yu¹, CHEN Gang¹ , HUANG Jian¹, XU Yi²
		Automated recognition of spectral signal is an importance part of spectral analysis, which involves comparing spectral signals under the same conditions and obtaining relation of chemistry constitution according to similarity by pattern recognition method and computer technique, and is useful to determine the nature of spectral signal and validate spectral signal.This paper takes spectral signal according with Lambert-beer′law as object, introduces basic theory and method of recognition of spectral signal in brief, normalizes spectral signal to decrease difficulty, introduces wavelet analysis theory, puts forward the method of wavelet packet analysis to gain features of spectral signal, obtains formula to compute feature vector and error vector by statistics method, then makes use of binary tree′ mode distinguishing step by step for quick recognition, and finally gives an example to explain.
		2005 Vol. 25 (08): 1332-1335 [Abstract] ( 1088 ) PDF (440 KB) ( 374 )

	1336	Speciation Analysis of Mercury by Capillary Electrophoresis On-Line Coupled with Inductively Coupled Plasma Mass Spectrometry Based on a Micro Mist Nebulizer and a Removable Interface
		LI Bao-hui¹, YU Li-ping², WANG Zhao-hui¹, LIU Li-wen¹,YAN Xiu-ping^1*
		A method for mercury speciation analysis was developed by CE-ICP-MS with a Micro Mist nebulizer and a removable interface.Contamination of ICP-MS detector by the rising solution was avoided with the use of a removable interface during capillary rinsing.Baseline separation of methylmercury (MeHg) and inorganic mercury (Hg²⁺) was obtained by CE in a 45 cm×75 μm i.d.fused-silica capillary at 22.5 kV，while a mixture of 30 mmol^-1 H₃BO₃+10% CH₃OH (pH 8.7) acted as running electrolyte.The precisions (RSD, n=5) of migration time and peak area for the mercury species were in the ranges of 3.5%-3.8% and 2.3%-5.1%, respectively.The limits of detection (3σ) of MeHg and Hg²⁺ were 47 and 48 μg·L^-1, respectively.
		2005 Vol. 25 (08): 1336-1338 [Abstract] ( 666 ) PDF (443 KB) ( 405 )

	1339	Artificial Neural Network Forecasting Method in Monitoring Technique by Spectrometric Oil Analysis
		YANG Yu-wei, CHEN Guo
		The spectrometric oil analysis (SOA) is an important technique for machine state monitoring and fault diagnosis, and forecasting machine state through SOA results has an advantage of finding out machine system wear fault early.Because Artificial Neural Network (ANN) possesses obvious advantages over traditional forecasting models for identifying non-linear model and forecasting non-even signal, the ANN forecasting approach was applied to monitoring technique by SOA, and the monitoring technique by SOA based on ANN forecasting was put forward.In the forecasting model, a 3-layer BP network structure was adopted.Aiming at the problem that ANN structure has a great effect on forecasting precision, the authors utilized the Genetic Algorithm (GA) to optimize the node number of input layer, the node number of hidden layer, and MSE (Mean of Squared Error) target value which was required for ANN training, and obtained the optimum forecasting model of ANN.Finally, the practical SOA data of some engine was analyzed and forecasted by ANN, and the forecasting result was compared with that of traditional ARMA model.The result fully shows the superiority and effectivity of the new method.
		2005 Vol. 25 (08): 1339-1343 [Abstract] ( 1150 ) PDF (545 KB) ( 371 )

	1344	Determination of Nine Life Elements in Brick Tea by ICP-AES
		LI Hai-long^{1, 2}, WANG Li-zhen¹, WANG Wu-yi¹
		ICP-AES was used for the direct determination of nine life elements (Ca，Mg，K，Al，P，Cu，Zn，Fe and Mn) in brick tea.The RSDs of the method were between 2.11% and 8.68%, and the analytical results of the tea reference samples were consistent with the certified values.The method was simple and accuracy.The analytical results of brick tea were compared with those of the ordinary leaf tea (green tea, scent tea and oolong tea).The Al, Fe, Mn, Ca and Mg contents of brick tea were about 5.78, 3.26, 2.19, 2.11 and 1.64 times higher than those of the ordinary leaf tea respectively.The P, K, Zn and Cu contents of brick tea were 48.70%, 85.68%, 78.19% and 98.78% times lower than those of the ordinary leaf tea respectively.
		2005 Vol. 25 (08): 1344-1346 [Abstract] ( 1828 ) PDF (386 KB) ( 370 )

	1347	Determination of Water-Soluble Antimony (Ⅲ) and Antimony(Ⅴ) in Leigongteng Using Ultrasound-Assisted Extraction by HG-ICP-AES
		XIE Jian-xin, DENG Bi-yang^*
		A method for the determination of water-soluble antimony (Ⅲ) and antimony(Ⅴ) in Leigongteng using ultrasound-assisted extraction by hydride generation inductively coupled plasma atomic emission spectrometry was developed in the present paper.Affecting parameters of ultrasound extraction, the pH of antimony species, the operation condition of hydride generation and inductively coupled plasma atomic emission spectrometry were investigated and optimized.The effect of coexisting ions on the determination of antimony was also investigated.The detection limits are 0.3 and 2.4 ng· mL^-1 for antimony (Ⅲ) and antimony(Ⅴ), respectively, and with RSD 3.9% for antimony (Ⅲ) and 4.5% for antimony(Ⅴ).The recovery is in the range of 93% to 105%.
		2005 Vol. 25 (08): 1347-1350 [Abstract] ( 1101 ) PDF (549 KB) ( 398 )

	1351	Determination of the Contents of Fourteen Elements in Urine of Xinjiang Kuitun Fluorine Poisoning and Arsenic-Fluoride Poisoning Patients by ICP-AES
		SUN Lian¹，LIU Hai¹，CHANG Jun-min¹，LIU Kai-tai², YANG Pei-jun³, FENG Yan-bo³
		A method of determining the contents of K，Na，Ca，Mg，P，Zn，Al，Ba，Co，Cu，Ni，Sr，Cr and Ti, fourteen elements, in urine of Xinjiang Kuitun fluorine poisoning and arsenic-fluoride poisoning patients was developed.The operation conditions of ICP-AES, and the lowest test concentration，precision and linear ranges were studied.The relative standard deviation of the method was 0.24%-2.47%(n=10)，the average recoveries were 90.4%-100.5%.The contents of K and Na in urine of fluorine poisoning and arsenic-fluoride poisoning patients were higher than those of healthy contrast group.The contents of Ba，Co，Cu，Ni and Cr in the urine of arsenic-fluoride poisoning patients were higher than those of fluorine poisoning patients and healthy contrast group(P＜0.05).The contents of P，Ca，Mg，Zn，Al，Sr and Ti do not have statistic significance(P＞0.05).The method was sensitive，simple and accurate.The experiment data was reliable.
		2005 Vol. 25 (08): 1351-1354 [Abstract] ( 400 ) PDF (374 KB) ( 380 )

	1355	Determination of Trace Bismuth in Traditional Chinese Medicines by Hydride Generation Atomic Fluorescence Spectrometry
		SHI Jie, SONG Qing-guo, ZHAO Kai-lou, GONG Xue-yun
		A method is reported for the determination of trace bismuth in traditional chinese medicine by hydride generation atomic fluorescence spectrometry.The effect of different means of digestion, the medium amounts of acid and reducing agent on the determination of Bi is investigated.In the given conditions, the linear range of determination is 0.1-200 μg·L^-1, and the detection limit is 0.094 6 μg·L^-1.The instrumental relative standard deviation is about 0.55% and the recovery is about 94%-107%.The method is accurate, rapid and convenient with satisfactory results.
		2005 Vol. 25 (08): 1355-1357 [Abstract] ( 1594 ) PDF (460 KB) ( 392 )

	1358	HG-AFS Determination of Se in Trionyx Triunguis
		DUAN Min, WANG Bo
		The Se content in Trionyx triunguis was studied by atom fluorescence photometer with wet digestion.The recovery of the method is 96.2%-103.0%, relative standard deviation is 3.69%, the determined value of national standard substance pork are agree with standard value; and the method is simple, convenient, fast with good accuracy and precision.The results showed that Se in Trionyx triunguis was very rich, more 1.2-9.4 than Se contant in animal meal, more ten to hundred then it in refresh vegetables and fruits.These results provide a useful scientific base for making and exploiting healtyful foods with Se trionyx triunguis.
		2005 Vol. 25 (08): 1358-1360 [Abstract] ( 243 ) PDF (476 KB) ( 380 )

	1361	The Corn Seedlings are Affected by the Heavy Metal Pb²⁺
		ZHENG Chun-xia¹，WANG Wen-quan¹，LUO Jian-min^２，ZHAO Xia¹，ZHANG Hong¹，ZHANG Xiao-wei¹
		The corn seedlings in hydroponic culture are treated with the lead acetate solutions of various concentrations, the content of Pb²⁺ in the roots, stems and leafs of the corns at 10th day, 20th day and 30th day is measured.The analyzing conclusions are that the contents of Pb²⁺ in the corns display a sequence of root＞leaf＞stem, the contains of chlorophyll in corns fall off, the raising of Pb²⁺ in solutions, the membrane penetrability of the corns increased along a sequence of root＞leaf＞stem，and the harmful rate of Pb²⁺ display a sequence of root＞leaf＞stem in corns.The data of the study gives some references for the further researches of the crops, relating the endurance and the distributing of corns with Pb²⁺.
		2005 Vol. 25 (08): 1361-1365 [Abstract] ( 1029 ) PDF (723 KB) ( 400 )

	1366	Synthesis and Characteristic of Cobalt Bearing Ferrite Particles at Room Temperature
		WANG Jing，DENG Tong，FENG Ya-ping，DAI Yu-jie
		Cobalt bearing magnetite particles were synthesized by aerial oxidation of ferrous and cobalt ions at alkaline condition and room temperature.The samples obtained at different time intervals during reaction were subjected to XRD and IR, and it was indicated that the cobalt-bearing ferrites were produced through green-rust intermediate phase.Different compounds were synthesized using 1/20, 1/15, 1/10, 1/7, 1/5 and 1/3 Co²⁺/Fe²⁺ starting ratios, and Co-ferrites with Co/Fe of 0.05, 0.06, 0.08，0.12，0.17，0.18 were obtained.The chemical composition, microstructure and micrograph of those precipitates were characterized by chemical analysis, IR, XRD and SEM.The results revealed that Co²⁺ replaced Fe³⁺ at octahedral position in spinel structure, and the increase of Co in initial solution showed deleterious effect on the crystallinity of the precipitates.
		2005 Vol. 25 (08): 1366-1370 [Abstract] ( 445 ) PDF (852 KB) ( 362 )

	1371	Studies on the Crystallization Characteristics of the Hard Segments in Ethylene Terephthalate-ε-Caprolactone Copolyesters
		ZHANG Guo-ying, CUI Zhe, QU Bao-jun
		The crystallization characteristics of the ethylene terephthalate (ET) hard segments in ethylene terephthalate-ε-caprolactone (TCL) copolyesters were studied by wide-angle X-ray diffraction (WAXD) and Fourier transform infrared spectroscopy (FTIR).It was found that in TCL copolyesters with high hard segment content, the ET hard segment can crystallize to form the crystals having the similar lattice structure as that of pure poly(ethylene terephthalate) (PET).The lamellar thickness and the crystallinity of the ET crystals depend on the ET segment sequence length.As the segment sequence length decreases, the lamellar thickness and the crystallinity decrease.
		2005 Vol. 25 (08): 1371-1374 [Abstract] ( 1135 ) PDF (426 KB) ( 368 )

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