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2005 Vol. 25, No. 07 Published: 2005-07-26

光谱学与光谱分析

	1009	Studies on the Spectrum and Frequency Repetition of Double-Mode He-Ne Laser with Frequency Stabilization
		ZHANG Hui, SHEN Nai-zheng
		Theoretical analysis of spectrum and frequency repetition of the double-model frequency stabilization He-Ne laser has been done, and the beat frequency experiment using 632 nm I₂ frequency stabilization He-Ne laser has been carried out.The authors used the intercavity laser, and the double mode frequency stabilization to get the laser stabilized output through adjusting the two neighbor vertically polarized modes to the equal power reference point.Through the experiment, the authors analyzed the factors which affect the laser frequency repetition and stabilization, and measured the stabilized laser power and the frequency stabilization.The beat frequency experiment has shown that the frequency repetition can reach (1-2)×10^-8 by frequency difference, and the laser stabilization can reach 10^-10 by Allan variances.The experiments show that the stabilized laser can work well and can be used as frequency reference point.
		2005 Vol. 25 (07): 1009-1012 [Abstract] ( 1529 ) PDF (492 KB) ( 354 )

	1013	Spectroscopic Investigation of Magnetic Field Effects on Radical Reactions Induced by Laser Excitation
		CHEN Jia-fu,GAO Yu-he
		Dynamic spin chemistry, including magnetic field effects (MFE), magnetic isotope effects (MIE), CIDEP and CIDNP, has become a research area.In the present paper, the authors briefly introduced the development history and the spectroscopic research state of magnetic field effects for the radical reactions induced by laser excitation.The possible reasons for magnetic field effects of the radical reactions, theories for the conversion of singlet and triplet states, and mechanisms of magnetic field effects were explained and the recent development state of magnetic field effects for the radical reactions was also introduced to domestic scientists.
		2005 Vol. 25 (07): 1013-1016 [Abstract] ( 1052 ) PDF (426 KB) ( 333 )

	1017	Electrolytic Coloration and Spectral Property of Potassium Bromide Crystals
		SONG Cui-ying¹, GU Hong-en¹, WU Yan-ru²,HAN Li¹
		Potassium bromide crystals were effectively colored electrolytically with a lab-made electrolytic apparatus at 693 K by applying a DC 1 200 V voltage.A lot of F, R, M and N type and some new unknown color centers were produced in the colored potassium bromide crystals, and the formation and transformation mechanisms of the color centers were presented.Spectral measurement and analysis were carried out systematically for the colored crystals, the spectral bands of corresponding color centers were reasonably resolved from the measured spectra, and the corresponding spectral parameters of the spectral bands were accurately determined by using spectral decomposition.
		2005 Vol. 25 (07): 1017-1020 [Abstract] ( 1621 ) PDF (529 KB) ( 381 )

	1021	Spectral Study of N₂O under Pulsed DC Discharge
		ZHANG Xian-yi^{1, 2}, KAN Rui-feng^{1, 3}, KONG Xiang-lei¹, LUO Xiao-lin^{1, 3}, ZHANG Wei¹, LI Hai-yang^1*
		A new equipment of pulsed DC discharge supersonic molecular beam was set up for producing transient species.The pulsed DC discharge can be used stably under 10 kV.In data collection using software, it can be utilized as gated integrators and averagers.Using this equipment, the processes of N₂O discharge were studied.The emission spectra of N₂O⁺(²Σ⁺-²Π_i) were obtained.From the intensity of vibrational spectra, the vibrational populations of the N₂O⁺(²Σ⁺) states were calculated.Compared with other results, states of N₂O⁺ depart even more from a Boltzmann distribution.
		2005 Vol. 25 (07): 1021-1025 [Abstract] ( 454 ) PDF (530 KB) ( 356 )

	1026	Photoluminescence of Tetragonal ZrO₂ Nanoparticles Synthesized by Severral Methods
		LIU Li¹, JIANG Xin¹, LIANG Jia-he², LI Ya-dong², LI Fu-li¹
		Five methods for the preparation of stabilized ZrO₂ nano-powders have been used.They are hydro-thermal method, alcohol-thermal method, sol-gel method, microwave-irradiation, and sonochemical method.XRD (X-ray diffraction) and PL spectra (Photoluminescence spectra) have been utilized to characterize these samples.Stable tetragonal nanometre ZrO₂ powders have been synthesized by these methods.From the XRD pattern, it is clear that the ZrO₂ samples we obtained are crystal and distributed well.The PL pattern shows that the nano-ZrO₂ powders can emit clear red and blue light when they are excited by the ultraviolet.The emphasis of this thesis is to discuss the ZrO₂ emission nanocrystals` luminescent procedures.
		2005 Vol. 25 (07): 1026-1029 [Abstract] ( 1098 ) PDF (453 KB) ( 399 )

	1030	Studies on Photoluminescence Spectra of Polyfluorene under Modulation of Electric Field
		LI Yun-bai,TENG Feng,XU Zheng, HOU Yan-bing, XU Xu-rong
		The photoluminescence of polyfluorene thin film modulated by an electric field are studied.The results show that the photoluminescence from polyfluorene film can obviously quenched by the extra electric field， which is attributed to the electric field-induced dissociation of photogeneration excitons.The dependence of the exciton dissociation rate constant on the intensity of electric filed is fitted.The average hopping distance of element charge is 0.68 nm in PFO.This volume is comparable with the reported results in Alq₃ and polymers.The spectral dependence of the factor of EFIQP is given.The dissociation of hot-exciton is deduced, which influences on the spectral dependence of the EFIQP factor slightly.
		2005 Vol. 25 (07): 1030-1033 [Abstract] ( 1158 ) PDF (437 KB) ( 374 )

	1034	VUV Spectral Properties of (Y,Gd)Al₃(BO₃)₄:Tb
		LIU Duan-yang¹, HE Da-wei^1*, KANG Kai¹, LIU Chun-tang¹, LI Shao-xia¹，SHEN Fang¹, TAO Ye²
		(Y,Gd)Al₃(BO₃)₄ doped with Ce and Tb were prepared by solid state reaction.The structure, VUV excitation properties, and luminescence properties under VUV excitation were studied.(Y,Gd)Al₃(BO₃)₄ belongs to trigonal crystal system with the space group of R32, and the crystal structure does not change as Tb³⁺ and Ce³⁺ ions are doped to the crystal lattice.The host absorption band of (Y,Gd)Al₃(BO₃)₄:Tb moves to longer wavelength as Gd³⁺ mol concentration increases.The energy transfer between Gd³⁺ and Tb³⁺ is very effective, and the samples with high Gd³⁺ mol concentrations have high radiant efficiencies.It was found that the luminescence of Tb³⁺ is quenched by Ce³⁺ in (Y,Gd)Al₃(BO₃)₄:Ce, Tb under VUV excitation.
		2005 Vol. 25 (07): 1034-1037 [Abstract] ( 1704 ) PDF (435 KB) ( 360 )

	1038	Flow Injection Analysis of Ciprofloxacin by Terbium Sensitized Chemiluminescence Method
		LIAN Ning^1，2,WANG Jian-chao²,LENG Wen-hong³, CHANG Xi-jun^1*
		A new flow injection chemiluminescence (CL) method for the determination of Ciprofloxacin (CPLX) was described.The method was based on the weak CL reaction of Ce(Ⅳ)-SO^2-₃ sensitized by Tb³⁺-CPLX.The relative CL intensity was linear with the concentration of CPLX in the range of 9.0×10^-9-1.0×10^-6 mol·L^-1.The detection limit is 2.2×10^-11 mol·L^-1.The relative standard deviation (RSD) for the determination of 5.0×10^-8 mol·L^-1 CPLX is 3.0% (n=11).The method has been successfully applied to the analysis of CPLX in tablet and capsule.An original mechanism was proposed to explain this phenomenon.
		2005 Vol. 25 (07): 1038-1041 [Abstract] ( 1686 ) PDF (433 KB) ( 363 )

	1042	Passive Remote Sensing of VOC in Atmosphere by FTIR Spectrometry
		GAO Min-guang, LIU Wen-qing, ZHANG Tian-shu, LIU Jian-guo, LU Yi-huai, ZHU Jun, LIAN Yue, LU Fan
		The paper expatiates the passive remote sensing experiment of VOC in atmosphere by FTIR spectrometry, a mode of simulated spectra for pollution gas in a complicated environment is proposed, and the detecting limit of passive FTIR remote sensing is discussed.Using this measurement technique and the data analysis method, the authors can obtain column density and effective radiation temperature of target-gas that does not require a previously measured background spectrum.
		2005 Vol. 25 (07): 1042-1044 [Abstract] ( 1493 ) PDF (391 KB) ( 440 )

	1045	Preparation and Infrared Spectral Analysis of Nanoporous Silica Thin Film
		WANG Juan，ZHANG Chang-rui，FENG Jian，YANG Da-xiang
		Crack-free homogeneous nanoporous silica films on silicon wafer have been synthesized via supercritical drying of wet gel films obtained by spin-coating the polymeric silica sol，which was prepared using sol-gel method with tetraethoxysilane(TEOS) as precursor.The film is amorphous and nanoporous, and three-dimensional network, cross-linked by the primary particles whose sizes distribute between 10-20 nm showed respectively by XRD and SEM micrograph.The structure of the nanoporous SiO₂ thin film was studied by FTIR spectra.The SiO₂ thin film was composed of Si—O—Si and Si—OR, and was hydrophobic.The film contained Si—OH and became hydrophilic after being heat-treated at 250 ℃ or above in air.The heat-treated SiO₂ thin film becomes hydrophobic by reacting with trimethylchlorosilane(TMCS).The TMCS-modified SiO₂ thin film remains hydrophobic and can keep its nanoporous structure at a temperature lower than 450 ℃ in nitrogen.
		2005 Vol. 25 (07): 1045-1048 [Abstract] ( 300 ) PDF (722 KB) ( 395 )

	1049	Analysis of Multi-Component Sugar Aqueous Solution in Low-Concentration by Near-Infrared Spectrometry
		HU Bin, CHEN Da, SU Qing-de^*
		Near infrared spectrophotometry was used to determine the concentrations of one, two and three-component sugar aqueous solutions.However, this method was always applied to dry or low moisture products and was not practicable for fresh fruits and vegetables because of the strong absorption of water in near infrared region.In this paper, the authors applied NIR method to aqueous solutions and discussed how to enhance the sensitivity.In aqueous solution systems, concentration of each individual sugar was in range of 0.01-0.25 mol·L^-1.Different calibrations and predicted results were gotten and compared to each other when full spectra or significant spectra regions were considered.By selecting relevant spectra regions due to important structural information to overcome the disturbance from absorption of water, calculations could be optimized and predicted results of concentrations were more accurate regarding the standard error of calibration (SEC) and standard error of prediction (SEP).
		2005 Vol. 25 (07): 1049-1052 [Abstract] ( 1062 ) PDF (470 KB) ( 374 )

	1053	Fourier Transform Infrared Spectroscopic Study of Different Parts of Wild Growing Edible Mushrooms
		LIU Gang¹, LIU Jian-hong², SONG Ding-shan³, DONG Qin⁴, OU Jia-ming¹, YANG Ai-ming⁴
		In this paper, vibrational spectra of different parts of fruiting bodies of wild growing mushrooms were recorded with Fourier transform infrared spectrometer.It was different for the spectra of cap skin, gill, cap meat and stem of the same mushroom.The great differences were found between cap skin and other parts of the same mushrooms of Russula virescens and Russula rubra, whereas the spectra of mushroom Termitomyces albuminosus show greated differences between gill and other parts.These indicate variety in the chemical composition of different parts of the same fruiting body.The results suggest that the mushrooms could be identified at the species level by comparison of the vibrational spectra of different parts of fruiting bodies of mushrooms.
		2005 Vol. 25 (07): 1053-1056 [Abstract] ( 1593 ) PDF (532 KB) ( 386 )

	1057	Study of Photocatalytic Performance of TiO₂ Membrane for Oleic Acid by FTIR-ATR Technique
		LIN Hua-xiang, WANG Xu-xu^*, DAI Wen-xin, FU Xian-zhi
		The TiO₂ membranes were prepared on glass，ceramic tile and aluminum pieces by Sol-Gel and PVD methods.A fast and exact evaluation on the photocatalytic self-cleaning performance of the membrane materials was achieved by FTIR-ATR technique using oleic acid which was laid on the surface of the membrane.The hydrophilic property of the samples was also determined by the contact angle with water.The results showed that both the TiO₂ membrane prepared on glass by the Sol-Gel and PVD methods displayed good photo-induced hydrophilic property and degradation activity of oleic acid, and no difference in hydrophilic property, but the former was a little superior to the latter in photocatalytic activity.The photocatalytic conversion of oleic acid on the TiO₂/galss, TiO₂/ceramic tile and TiO₂/ aluminum piece were 92%, 85% and 46%, respectively after illumination 3.5 h, showing a distinct effect of support material property on TiO₂ photocatalytic performance.The results suggested that the photocatalytic activity of TiO₂ membrane coated on insulator support was higher than that coated on conductor support.
		2005 Vol. 25 (07): 1057-1060 [Abstract] ( 394 ) PDF (500 KB) ( 392 )

	1061	Application of Near Infrared Sensor to the Technology of Automobile Transformation
		WANG Song-de,HAN Yun-xia,ZHU Xiao-long,YANG Jie-hui
		Using reflective near infrared sensor and voice record-reproducing assembly, the present article studies the voice anticollision-prompting device for backing an automobile.If there is a man or an object within a certain distance behind the backing automobile，part of the infrared signal will be reflected by the man or the object, and received by the photosensitive tube installed with a transmitting tube, and transformed to a similar frequency electric signal.The electric signal will be amplified, demodulated, and shaped by the circuit of module.After comparing and processing, the control signal will be output, which controls the work of voice record-reproducing assembly, and reminds the driver that there is a man or an object behind the backing automobile.With both the near infrared sensor and voice record-reproducing assembly being integrated, the distance-warning device has the advantages of low costs, simple wiring, strong anti-detonation ability, precise measuring, and working stability.It is suitable for being installed and used on the automobile.
		2005 Vol. 25 (07): 1061-1063 [Abstract] ( 1165 ) PDF (391 KB) ( 372 )

	1064	Investigation of Phase Morphology of PS／PMMA Blend Thin Film by Surface Enhanced Raman Scattering
		ZONG Qi¹, XIE Yu-ming^1*, CHEN Feng-en², YU Jian-yuan²
		Polystyrene/poly (methyl methacrylate) (PS/PMMA) was studied after the thin films were prepared on glass substrate by spin-coating from THF.Raman spectroscopy combined with microscopy was used to obtain information on the morphology and structure of the thin films.From the relative intensities of the peaks around 1 604 and 1 585 cm^-1 due to stretching of benzene rings, and 1 728 cm^-1 due to stretching of CO for PS and PMMA respectively, the authors could define the composition of the domains in the sea-island-like phase-separated structure in the microscopic image.Furthermore, the structure evolution was followed by Raman spectroscopy during the in-situ annealing of PS/PMMA (30/70) blend thin films at 210 ℃.And the effect of SERS on the PS thin films was also discussed.
		2005 Vol. 25 (07): 1064-1067 [Abstract] ( 1721 ) PDF (691 KB) ( 428 )

	1068	Synthesis and SERS Characterization of Silver Nanocubes
		ZHOU Hai-hui, WU De-yin, HU Jian-qiang, TIAN Zhong-qun^*
		Silver nanocubes were synthesized by reducing silver nitrate with ethylene glycol in the presence of poly(vinyl pyrrolidone) based on the report by Xia’s group.Silver nanocubes were immobilized on silicon wafers by self-assembly processes.SERS activity of silver nanocubes was detected by using pyridine and SCN^- respectively as probe molecules.The preliminary results show that the Raman intensities of pyridine and SCN^- adsorbed at silver nanocubes were enhanced considerably, indicating that silver nanocubes can be used as a good SERS substrate.On the other hand, SERS combined with the probe molecule method can be used to characterize the optical property of silver nanocubes.
		2005 Vol. 25 (07): 1068-1070 [Abstract] ( 1660 ) PDF (479 KB) ( 434 )

	1071	Spectral Analyzing Effects of Atmosphere States on the Structure and Characteristics of CdTe Polycrystalline Thin Films Made by Close-Spaced Sublimation
		ZHENG Hua-jing^{1, 2}, ZHENG Jia-gui^2*,FENG Liang-huan²,ZHANG Jing-quan²,XIE Er-qing¹
		The structure and characteristics of CdTe thin films are dependent on the working atmosphere states in close-spaced sublimation.In the present paper, CdTe polycrystalline thin films were deposited by CSS in mixture atmosphere of argon and oxygen.The physical mechanism of CSS was analyzed, and the temperature distribution in CSS system was measured.The dependence of preliminary nucleus creation on the atmosphere states (involving component and pressure) was studied.Transparencies were measured and optic energy gaps were calculated.The results show that: (1) The CdTe films deposited in different atmospheres are cubic structure.With increasing oxygen concentration, σ increases and reaches the maximum at 6% oxygen concentration, then reduces, and increases again after passing the point at 12% oxygen concentration.Among them, the sample depositing at 9% oxygen concentration is the best.The optic energy gaps are 1.50-1.51 eV for all CdTe films.(2) The samples depositing at different pressures at 9% oxygen concentration are all cubical structure of CdTe, and the diffraction peaks of CdS and SnO₂:F still appear.With the gas pressure increasing, the crystal size of CdTe minishes, the transparency of the thin film goes down, and the absorption side shifts to the short-wave direction.(3) The polycrystalline thin films with high quality deposit in 4 minutes under the depositing condition that the substrate temperature is 550 ℃, and source temperature is 620 ℃ at 9% oxygen concentration.
		2005 Vol. 25 (07): 1071-1076 [Abstract] ( 80 ) PDF (669 KB) ( 365 )

	1077	Study on Characteristics of Fluorescence Spectra of Dissolved Organic Matter with Different Water Quality
		ZHAO Nan-jing, LIU Wen-qing, LIU Jian-guo, ZHANG Yu-jun, LI Hong-bin, DING Zhi-qun, LI Wei-hua, ZHOU Meng-ran, YANG Li-shu
		The fluorescence spectra of dissolved organic matter (DOM) in several types of water samples in combination with laser-induced fluorescence(LIF) measurements were measured in the laboratory, and the spectral characteristics of DOM were analysed.The curve of normalized fluorescence intensity against corresponding concentration of humic acid is showed.The results demonstrate the possibilities of water quality monitoring based upon fluorescence spectral characteristics of DOM by means of LIF method.
		2005 Vol. 25 (07): 1077-1079 [Abstract] ( 1709 ) PDF (407 KB) ( 464 )

	1080	Determination of Vitamin B₁₂ Concentration by Fluorescence Quenching with Acridine Orange-Rhodamine 6G Energy Transfer System
		LIU Bao-sheng, GAO Jing, YANG Geng-liang
		An energy transfer technique between acridine orange (AO) and rhodamine 6G (R6G) was studied, and the optimum experimental conditions of energy transfer were defined.It was found that the effective energy transfer could occur between AO and R6G in the dodecylbenzene sodium sulfonate solution with Na₂HPO₄-citric acid buffer solution at pH 5.0.The fluorescence intensity of AO-R6G system was diminished by vitamin B₁₂ in an alkalescence medium.Based on the AO-R6G energy transfer system a novel fluorescence quenching method for the determination of vitamin B₁₂ has been developed.Under optimal conditions, the linear range of calibration curves for the determination of vitamin B₁₂ was 0-3.0×10^-5 mol·L^-1.The detection limits were 4.8×10^-7 mol·L^-1 for Vitamin B₁₂.Among six times of determination, the relative standard deviation was 0.51%-0.64%, and the recovery was 98.40%-103.62%.The method features good recurrence, rapidity of reaction, good stability, and few interfering substances.It can be satisfactorily used in the determination of the injection content of vitamin B₁₂.
		2005 Vol. 25 (07): 1080-1082 [Abstract] ( 1593 ) PDF (339 KB) ( 383 )

	1083	Fluorescence Spectroscopy and Imaging for Optical Biopsy
		LI Bu-hong, XIE Shu-sen
		In the past few years extensive attention has turned toward optical biopsy, because of its ability to perform noninvasive, real time and accurate diagnosis of tissue pathologies, especially precancer.Fluorescence spectroscopy is one of a series of techniques widely developed for optical biopsy, and can be generally divided into two categories: fluorescence spectroscopy and imaging.This paper reviews the applications of autofluorescence and exogenous fluorescence to optical biopsy, and the principle and advantages as well as the clinic applications of various steady-state and time-resolved fluorescence spectroscopy and imaging techniques.Furthermore, the development perspectives of optical biopsy by using fluorescence spectroscopy and imaging are also briefly discussed.
		2005 Vol. 25 (07): 1083-1087 [Abstract] ( 1082 ) PDF (608 KB) ( 415 )

	1088	Study on the Interaction of Water-Soluble p-(N, N-Dimethylaminomethyl)calix[8]arene with DNA by Fluorescent Spectrometry
		LI Lai-sheng, HUANG Zhi-bing, WANG Yu-xiao，LIU Xu，LI Yan-ping，GE Xiao-hui
		The interaction of water-soluble p-(N, N-dimethylaminomethyl)calix[8]arene (CX8) with DNA was studied using adriamycin(ADM) as a probe by fluorescent spectrometry.The effect factors such as, pH of solution, salt effect and unlinking DNA on the spectra were also investigated.The interaction mechanism was proposed.The authors observed that the fluorescence of ADM was quenched by calf thymus DNA, and the fluorescence intensity of DNA-ADM enhanced with the increasing of the CX8 gradually.The result indicates that the strong electrostatic interaction between the oxyphosphate anion of DNA and the CX8 existed.According to the plot of scatchard, the results imply that the influence of CX8 on interaction of DNA-ADM belongs to mixed model, on the one hand, in the condition of neutral and acidity, the oxyphosphate anion of DNA can be neutralized by CX8 partially, which induced the contraction of DNA and the conformational change of DNA, which led to release ADM from DNA partially，on the other hand, the CX8 can also compete the electrostatic sites with ADM directly.
		2005 Vol. 25 (07): 1088-1091 [Abstract] ( 1624 ) PDF (525 KB) ( 465 )

	1092	The Interface Fluorescence and Resonance Scattering Spectral Properties of Ag₂S Nanoparticles in Liquid Phase
		ZHANG Biao-ming¹, JIANG Zhi-liang^1*, ZHAI Hao-ying¹, HE You-qiu², LIU Shao-pu²
		S^2- and Ag⁺ form stable Ag₂S nanoparticles in the presence of sodium dodecyl sulphate(SDS).It exhibits a strong resonance scattering peak at 470 nm and a strong fluorescence peak at 470 nm when excitation wavelength is at 200 nm.The effects of TAA and Ag⁺ concentration on the fluorescence intensities are consistent with those on the resonance scattering signals.The resonance scattering and fluorescence intensities all increase with Ag⁺ concentration in the range of 0-8.0×10^-5 mol·L^-1.The results verified that there is a correlation between the fluorescence and resonance scattering.The fluorescence is the interface fluorescence of Ag₂S nanoparticles in liquid phase.
		2005 Vol. 25 (07): 1092-1094 [Abstract] ( 1687 ) PDF (379 KB) ( 358 )

	1095	Preparation and Application of CuS/Cu²⁺ Nanoparticles as a Resonance Light Scattering Probe
		XU Fa-gong, WANG Lun^*, WANG Le-yu, CHEN Hong-qi, ZHANG Li, LIU Jin-shui
		Cuprum-enriched cuprum sulfide nanoparticles (CuS/Cu²⁺) were prepared.The nanoparticles are water-soluble.They could be used as a resonance light scattering(RLS) probe in the determination of human gamma globulin, which was proved to be a simple, rapid and specific method.In comparison with organic dye probes, these nanoparticles probes are brighter, more stable against photobleaching, and do not suffer from blinking.Under optimum conditions, the response is linearly proportional to the concentration of gamma globulin between 0.1 and 1.5 mg·L^-1, and the detection limit is 0.064 6 mg·L^-1.
		2005 Vol. 25 (07): 1095-1098 [Abstract] ( 1071 ) PDF (670 KB) ( 380 )

	1099	Study on the Zinc Composition of Cadmium Zinc Telluride (Cd_1-yZn_yTe) Crystal by Micro-Photoluminescence Spectra
		HUANG Hui, PAN Shun-chen
		The micro-photoluminescence of five cadmium zinc telluride crystal wafers was measured by laser excited micro-Raman spectroscopy.The E_g value of cadmium zinc telluride material was calculated by fitting the micro-photoluminescence peaks which came from material band gap.Then the Zn composition of cadmium zinc telluride material could be obtained.By using the spectroscopic function of X-Y scanning technique fixing the photoluminescence peak, the mapping of Zn composition could be easily and non-destructively given.
		2005 Vol. 25 (07): 1099-1102 [Abstract] ( 1079 ) PDF (509 KB) ( 412 )

	1103	Highly Sensitive Spectrofluorimetric Determination of Trace Amounts of Chromium(Ⅵ) with Mono[6-o-(4-Aminobenzoic Acid)]-β-Cyclodextrin
		ZHANG Li, SHE Shi-ke, GAO Feng, ZHOU Yun-you, ZHU Chang-qing,WANG Lun^*
		A novel fluorescence probe, mono[6-o-(4-aminobenzoic acid)]-β-cyclodextrin(ACD), was synthesized, and a new sensitive fluorescence identification reaction was studied based on the reaction of Cr₂O^2-₇ with compound ACD in NaAc-HAc buffer medium at pH 4.90.Under optimal conditions the determination limit was 1.26 μg· L^-1.The linear range was 5.20-1 040 μg· L^-1.This method has been applied to the determination of trace amounts of chromium (Ⅵ)in electroplating liquor, electroplating waste water with satisfactory results.
		2005 Vol. 25 (07): 1103-1105 [Abstract] ( 1761 ) PDF (363 KB) ( 378 )

	1106	The Synthesis and Fluorescence Properties of Doping Europium-Benzonic Acid-Phenanthroline Complexes
		WANG Zheng-xiang¹, CHEN Hong^1，2, TAN Mei-jun¹,SHU Wan-gen¹
		Eu_1-xLn_x(BA)₃Phen(Ln： Gd，La，Y;BA： benzonic acid;Phen： phenanthroline; x=0.0-0.9) complexes are synthesized, and their similar structures showed by IR spectra.Fluorescence spectra indicate that the complexes can emit intense characteristic fluorescence from europium ion and the doping elements can enhance the fluorescence intensities of central europium ion and have co-fluorescence effect.
		2005 Vol. 25 (07): 1106-1109 [Abstract] ( 1077 ) PDF (406 KB) ( 378 )

	1110	Studies on the Determination of Protein with Spectroscopic Probe of o-Chlorophenylfluorone-Molybdenum(Ⅵ) Complex in Microemulsion Medium
		DU Bin¹, LI Yan¹, ZHANG Hui¹, WU Dan¹, WEI Qin¹, LI Zai-jun²
		The interaction and absorption spectral behavior of o-chlorophenylfluorone (o-CPF)-Mo(Ⅵ) and protein are studied in OP microemulsion medium.Under the optimum condition, the molar absorptivity of o-CPF-Mo(Ⅵ)-BSA system at 532 nm is 6.12×10⁶ L·mol^-1·cm^-1, and Beer’s law is obeyed in the range of 0-14 μg·mL^-1 of BSA.Moreover, the binding number between the complex and BSA determined by molar ratio and slope ratio methods is 91.The mechanism of interaction of BSA and o-CPF-Mo(Ⅵ) is also discussed.OP microemulsion media introduced into the protein determination increased markedly the sensitivity of the system.The result of experiment indicates that the method possesses a high sensitivity as well as a high selectivity.It can be used to determine protein in human urine with satisfactory results.
		2005 Vol. 25 (07): 1110-1113 [Abstract] ( 1581 ) PDF (537 KB) ( 396 )

	1114	Henry’s Law Constant Measurement for Hydrogen Peroxide Using Oxidative Decoloration of BPR
		CHEN Zhong-ming,QU Xiao-cao
		The temperature-dependent Henry’s Law Constant for hydrogen peroxide was measured.The gas phase of hydrogen peroxide from the vapor saturator collected in a cryogenic trap was analyzed by a spectrophotometric determination, based on the oxidative decoloration of BPR (bromopryogallol red) reaction with hydrogen peroxide under the catalysis of hemin.At 10 ℃-35 ℃, the relationship between Henry’s Law constant K_H (mol·L^-1·atm^-1) of hydrogen peroxide and temperature T (K) can be expressed as ln K_H=a/T-b, where a=7 269±22, and b=13.26±0.08.The standard heat of hydrogen peroxide aqueous solution is 60.43±0.18 kJ·K^-1·mol^-1.
		2005 Vol. 25 (07): 1114-1117 [Abstract] ( 1634 ) PDF (443 KB) ( 351 )

	1118	The Influence of Several Anions on Sonoluminescence
		LIU Yan¹, WANG Jun²
		1.1 MHz ultrasound was used to induce sonoluminescence in air-saturated solutions dissolved five kinds of anions in different ranges: NO^-₃: 0.2-20 mg·L^-1, F^-: 4-20 mg·L^-1, Cl^-: 5-25 mg·L^-1, HCO^-₃: 8-30 mg·L^-1, SO^2-₄: 0.4-40 mg·L^-1.It was found that four kinds of the anions, Cl^-, NO^-₃, HCO^-₃ and SO^2-₄ at the above mentioned concentrations have no influence on sonoluminescence.However, only F^- in the range of 4-20 mg·L^-1 can quench the sonoluminescence.The quenching mechanism was analyzed.
		2005 Vol. 25 (07): 1118-1120 [Abstract] ( 263 ) PDF (289 KB) ( 388 )

	1121	Spectrum Analysis of Erythrocyte Intracellular Hemoglobin with a Novel Fast Multi-Channel Micro-Spectrophotometry
		RUAN Ping¹, HUANG Yao-xiong², LI Dan³
		With the application of a novel fast multi-channel micro-spectrophotometry(MMSP), the absorption spectrum of intracellular hemoglobin molecule in a human single living red blood cell was monitored under the altered physiological environments (pH, temperature, partial pressure of oxygen, and osmotic pressure).It was found that on the absorption spectrum curve of hemoglobin the spike, the height and the position of the characteristic absorption peaks at 540 and 575 nm were altered obviously with the changes in physiological conditions, indicating that the concentration, structure and function of the hemoglobin in the red blood cell may be closely associated with the physiological environments.
		2005 Vol. 25 (07): 1121-1124 [Abstract] ( 1685 ) PDF (491 KB) ( 408 )

	1125	Study on the Characteristic Parameter of Oil Spectrometric Analysis
		WEI Hai-jun¹，WANG Hong-zhi¹，SUN Pei-ting¹，YU Hong-liang¹，GUAN De-lin¹，HU Qing-cun²，YIN Feng¹
		This paper establishes a new mathematics model of fault diagnosis basis of oil spectrometric analysis by means of long time following up the mechanical equipment’s lubrication oil.The characteristic parameter of oil spectrometric analysis has been confirmed using a new way that the laboratory experiment study and the mechanical equipment’s lubrication oil spectrometric analysis are combined in order to confirm the time of fault and avoid serious fault.It will provide the academic and actual basis for RCM and enhance the dependability.The result of examples proves that the characteristic parameter of oil spectrometric analysis has very high stability and veracity.This method has been proved that it was effective in fault diagnosis basis of oil spectrometric analysis.
		2005 Vol. 25 (07): 1125-1127 [Abstract] ( 1662 ) PDF (306 KB) ( 392 )

	1128	Study on Emission Spectrum of Some Single Element Hollow Cathode Lamps
		ZHAO Yun-bin,LIU Min,LIU Song
		In this paper, the emission spectra of 13 kinds of elements were determined on 19 single element hollow cathode lamps.The spectral overlap was discovered among emission lines of some elements and resonance lines or non-resonance lines of other elements.The reason for producing this phenomena was discussed initially.The viewpoint that these single element lamps can be used to the multi-element determination and as the light sources of simultaneous multi-elements determining atomic absorption spectrophotometer was put forward.
		2005 Vol. 25 (07): 1128-1130 [Abstract] ( 1061 ) PDF (248 KB) ( 402 )

	1131	Study on the Adsorption Behavior of Ga, In and Tl on Nanometer-Size Titanium Dioxide by ICP-AES
		HANG Yi-ping^1，2, QIN Yong-chao^1*, JIANG Zu-cheng¹, HU Bin¹
		The adsorption behavior of nanometer TiO₂ towards Gallium (Ga) Indium (In) and Thallium (Tl) was investigated with inductively coupled plasma atomic emission spectrometry (ICP-AES).The optimum conditions for adsorption were studied in detail, and the test included sorption kinetics, effect of pH on adsorption ratio, enrichment factor, and adsorption capacity.Under the optimum conditions, Ga(Ⅲ) , In(Ⅲ) and Tl(Ⅰ) ions could be adsorbed and recovered quantitatively.The static adsorption capacities of Ga(Ⅲ), In(Ⅲ) and Tl(Ⅰ) on nanometer TiO₂ were 48.6, 46.6 and 23.4 mg·g^-1 respectively.For the elution of Ga(Ⅲ), In(Ⅲ) and Tl(Ⅰ), a mixture of 0.1 mol·L^-1 EDTA solution and 1.0 mol·L^-1 HNO₃ was used, and the recovery ratio was above 92%.According to the definition of IUPAC, the detection limits (3σ) of this method for Ga, In and Tl with an enrichment factor of 12.5 are 3.0, 6.0 and 13 ng·mL^-1, respectively; and relative standard deviations (RSD) are 1.85%, 1.96% and 3.4%, respectively (n=6).The proposed method has been applied successfully to the analysis of geological samples with satisfactory results.
		2005 Vol. 25 (07): 1131-1134 [Abstract] ( 1208 ) PDF (445 KB) ( 400 )

	1135	Determination of Cadmium and Mercury in Tobacco Leaves Samples by CVAAS
		SHI Wei-wei, GAN Wu-er^*,SU Qing-de
		A new and sensitive method for the determination of cadmium and mercury was developed using nebulous phase reaction, cold vapor atomic absorption spectrometry (CVAAS).This design effectively reduces the loss of cadmium and volatile mercury species in aqueous solution and transfer process.The effects of several experimental parameters of the proposed system were optimized.Using the optimized experimental conditions, detection limits of 21 and 8 ng·L^-1 with RSD of 3.2% and 2.9% (n=11) were obtained for cadmium and mercury, respectively.This method has been successfully applied to the determination of cadmium and mercury in tobacco leaves samples with the recoveries over 92%.
		2005 Vol. 25 (07): 1135-1138 [Abstract] ( 1606 ) PDF (578 KB) ( 372 )

	1139	Spectrometric Determination of Trace Elements in ‘Jinguang’ Prunus Mume Var.Bungo of Different Growth Periods
		ZHANG Chuan-lai¹，FAN Wen-xiu²，GAO Qi-ming¹，JING Rui-jun²，LIN Zi-yu¹
		A study was carried out on the content of trace elements such as Ca, Fe, Zn, Mn and Cu of prunus mume var.bungo in different growth periods by WFX-110 atomic absorption spectrometry.The results indicated that the linear relationships of different elements within the limits of working curves are good and the range of the recovery is 98%-105%, hence showing that the results are satisfactory.The total content of these five trace elements increases as the fruit grows, but the concentration is related to the growth of fruit and fruit core, which provides us with valuable data.The contents of the trace elements essential to human body are relatively high, which shows that this fruit breed has a relatively high nutritive value.
		2005 Vol. 25 (07): 1139-1141 [Abstract] ( 986 ) PDF (393 KB) ( 377 )

	1142	The Determination of Chromium in Feeds by Flame Atomic Absorption Spectrophotometry
		WANG Jian, JIA Bin, GUO Li-ping，LIN Qiu-ping
		Chromium in feeds is regulated by China Standard GB 13078-2001.A method of flame atomic absorption spectrophotometry for the determination of Cr in feeds has been developed in allusion to shortage of China standard method.Several acetylene flow-rate, burner-high and the additive of interference suppressor NH₄Cl were studied respectively on the effect of sensitivities of Cr(Ⅲ) and Cr(Ⅵ).The two sets analytical average results of Cr in feed sample determined by calibration curves of Cr(Ⅲ) and Cr(Ⅵ) were tested by t test, no marked discrepancy was found.Optimum instrumental conditions of Cr(Ⅲ) and Cr(Ⅵ) with same sensitivity were confirmed.Sensitivity was 0.014 μg·mL^-1 with detection limit 0.70 mg·kg^-1.The recoveries were 94.4%-104.9%.Relative standard deviation of sample determination (5-6 times) was 1.90%-4.08%.This method is simply, fast and exact, the detection limit was answered for Cr limit in feeds regulated by GB 13078-2001, it can be applied to the analysis of Cr in feeds.
		2005 Vol. 25 (07): 1142-1144 [Abstract] ( 1110 ) PDF (374 KB) ( 381 )

	1145	Line Scanning Analysis of White Porcelain from Gong Kiln in Early Tang Dynasty by Energy Disperse X-Ray Fluorescence
		LING Xue¹,MAO Zhen-wei¹,FENG Min,HU Yao-wu¹,WANG Chang-sui¹,LIU Hong-miao^２
		Gong kiln, for its long porcelain-firing history, was one of three representative white porcelain kilns in northern China.In order to improve the quality and whiteness of white porcelain, a decorating layer or cosmetic earth was laid on the body surface in Gong kiln during early Tang dynasty, which was able to blot out rough surface and weaken the influence of fuscous body upon surface color.In this paper the main chemical composition of the white porcelain’s profile was analyzed by using energy disperse X-Ray fluorescence.The result showed that different materials were used as cosmetic earth during early Tang dynasty, in accordance with the phenomenon under optical microscope.In addition, the glaze belongs to calcium glaze in which plant ash was added.
		2005 Vol. 25 (07): 1145-1150 [Abstract] ( 1029 ) PDF (771 KB) ( 382 )

	1151	X-Ray Microanalysis of the Activity of Immobilized Glucose Oxidase on Enzyme Electrode
		LI Tong, YAO Zi-hua^*, QIU Man-de, AN Wei, SHI Da-gang
		The localization of activity of glucose oxidase (GOD) on the pussian blue modified electrode by SiO₂ sol-gel was studied by X-ray microanalysis.Glucose and Ce(NO₃)₃ served as substrate and capture respectively.Substrate was catalysed by immobilized GOD to produce H₂O₂，and the H₂O₂ was captured by Ce(NO₃)₃ to form precipitate.The precipitation deposited the active site of immobilized GOD on the enzyme electrode.The X-ray microanalysis showed that the distribution of active enzyme on the surface of the enzyme electrode was uniform, and the GOD immobilized maintained high activity.The X-ray analysis exhibited that the properties of the enzyme electrode depended on the distribution of enzyme activity on its surface from the view of microstructure, and the developed GOD electrode was of high sensitivity and excellent stability.The results agreed with the results of the electrochemical study.
		2005 Vol. 25 (07): 1151-1154 [Abstract] ( 1025 ) PDF (868 KB) ( 341 )

	1155	A Method for Redshift Determination of Quasars Based on Cross Correlation
		LIU Rong¹, DUAN Fu-qing^2*, LUO A-li³
		This paper presents a novel method for redshift determination of quasars.Firstly, a group of redshifts were determined using the emission line info extracted from the observed spectrum; Secondly, the template was redshifted according to the candidates, and the correlation between the observed spectrum and the redshifted template was measured.Finally, the redshift candidate corresponding to the highest correlation was chosen as the redshift.Compared with the existing methods based on spectral line matching, the proposed method has a lower dependence on the quality of spectral line extraction.Experiments show that this method is robust and superior to the methods based on spectral line matching.
		2005 Vol. 25 (07): 1155-1157 [Abstract] ( 1075 ) PDF (404 KB) ( 376 )

	1158	A Wavelet-Transform-Based Method for the Automatic Detection of Late-Type Stars
		LIU Zhong-tian¹, ZHAO Rui-zhen², ZHAO Yong-heng³,WU Fu-chao¹
		The LAMOST project, the world largest sky survey project, urgently needs an automatic late-type stars detection system.However, to our knowledge, no effective methods for automatic late-type stars detection have been reported in the literature up to now.The present study work is intended to explore possible ways to deal with this issue.Here, by “late-type stars" we mean those stars with strong molecule absorption bands, including oxygen-rich M, L and T type stars and carbon-rich C stars.Based on experimental results, the authors find that after a wavelet transform with 5 scales on the late-type stars spectra, their frequency spectrum of the transformed coefficient on the 5^th scale consistently manifests a unimodal distribution, and the energy of frequency spectrum is largely concentrated on a small neighborhood centered around the unique peak.However, for the spectra of other celestial bodies, the corresponding frequency spectrum is of multimodal and the energy of frequency spectrum is dispersible.Based on such a finding, the authors presented a wavelet-transform-based automatic late-type stars detection method.The proposed method is shown by extensive experiments to be practical and of good robustness.
		2005 Vol. 25 (07): 1158-1161 [Abstract] ( 1959 ) PDF (478 KB) ( 403 )

	1162	The Compensatory Light for Car Plate Recognition
		YU Chun-yu,CHANG Ben-kang, WANG Qing-bao
		In the intelligent traffic system, the automatic recognition system of the car plate is an important development field.This system must satisfy the requirement of all-day long inspection.In the course of inspection, the lack of natural light(such as at night, in rainy day...) could be a problem, that is to say there could be backlighting problem, and this problem can be solved by using compensatory light.By now, the high-power floodlight has been adopted.Because of its own characteristics of the floodlight, the satisfied result cannot be obtained.In the present thesis, how to select the right light is analyzed, including car lights’ spectra and visual response, and so on.The results of the practices are very satisfied.
		2005 Vol. 25 (07): 1162-1164 [Abstract] ( 2004 ) PDF (369 KB) ( 361 )

	1165	Study of Reference Material for Excitation Spectrum Wavelength Calibration of Fluorescence Spectrophotometer
		CHEN Xiao-bo, KANG Dong-guo, ZHAO Cheng-yi, LI Song, WU Zheng-long, MA Hui, LIU Zhong-min, ZHENG Zhe
		A reference material used for wavelength calibration of fluorescence spectrophotometer was found.The holmium doped oxide reference material GBW(E)130112 is a kind of standard reference material for absorption spectrophotometer.It can emit 547.7 nm fluorescence when excited by xenon lamp light.The excitation spectrum of 547.7 nm fluorescence was measured.It was found that the measured peaks of excitation spectrum are positioned at 333.56, 360.43 and 418.39 nm, respectively, which are coincident with the true values 333.8, 360.9 and 418.5 nm of reference material certification.It was illustrated that the holmium doped oxide reference material GBW(E)130112 could be used as reference material for the excitation wavelength calibration of the fluorescence spectrophotometer.Its property could be enhanced very much if high luminescent efficiency material is selected as rare earth ion doped matrix, and the purity is enhanced to reduce the cross relaxation.
		2005 Vol. 25 (07): 1165-1167 [Abstract] ( 496 ) PDF (305 KB) ( 398 )

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