分析测试技术与仪器

Application of UV Spectrophotometry-NMR Methodology in Research on Recognition Properties of Receptors Based on Deoxycholic Acid for Phenolic Compounds

YE Ying, SUO You-rui, YANG Yong-jing, YANG Fang, HAN Li-juan

2015, (1): 1-6.

Abstract(1418)

PDF(33)

Abstract:
Under the conventional heating condition, molecular tweezers a-d derived from deoxycholic acid were synthesized using deoxycholic acid methyl ester as the spacer, aryl hydrazine and carbamate as arms. Selective recognition properties of these molecular tweezers for phenol, p-methoxyphenol and m-methoxyphenol have been investigated by UV-Vis spectra titration and ¹H NMR study. The results indicate this type of molecular tweezers can form 1:1 supramolecular complex with phenol, p-methoxyphenol and m-methoxyphenol. The association constants (Ka) and Gibbs free energy changes (-△G⁰) for the supramolecular complexes have also been determined.

Study on Electrochemical Degradation Process for Sudan I Based on FTO Glass

QI Yan-zhen, CHEN Yi-ting, ZHANG Sen-ying, XU Yan-zhen, CHEN Xiao-ling

2015, (1): 7-11.

Abstract(1397)

PDF(28)

Abstract:
The electrochemical degradation process of Sudan I has been developed based on the Fdoped-tin oxide (FTO) glass. The effects of electrolyte concentration, pH,applied voltage, and initial concentration of Sudan I on the decolorization were studied. The results showed that the decolorization ratio of 0.01 g/L Sudan I was up to 60% within 20 min when using 20 g/L NaCl (pH 9.0) as the electrolyte, 12 V as the applied voltage.

Study of Phase Transition of Magnetic Materials with Addition of a Magnetic Field on a Diamond TG/DTA

BI Si-jun, SUI Wen-bao, LI Hua, ZHANG Jing, XUE De-sheng

2015, (1): 12-15.

Abstract(1453)

PDF(16)

Abstract:
The application of a comprehensive thermal analyzer Diamond TG/DTA in the research of magnetic material is introduced. Under the action of magnetic field, thermogravimetric curves(TG) of the samples were obtained. From the analysis of the TG curve of the magnetic phase transition of sample and the cause of the Curie temperature change, it is seen that positioning of the replaced Co element on the rare earth iron compound sample and the interaction between the elements have great impact on the Curie temperature. As a measuring method for Curie temperature,it expands the field of application and research for Diamond TG/DTA.

Several Common Nanomaterial-Based Optical Sensing Systems and their Application in Biochemical Analysis

LI Mei, CHEN Jia, HUANG Zu-liang, QIU Hong-deng

2015, (1): 16-27.

Abstract(1241)

PDF(21)

Abstract:
In recent years, the emergence of biological sensing technology has greatly promoted the development of bio-medical science, analytical chemistry, environment and other fields. Nanomaterials are often used as carrier materials and signal molecules due to their special physical and chemical properties. In this article optical biological sensing systems based on gold nanoparticles, quantum dots, graphene, carbon nanotubes, silica nanoparticles and their application in the biochemical analysis are introduced. Analysis and discussion on the principle and practical application of the system, and the prospects of research and application are given.

Analytical Application of Resonance Rayleigh Scattering Quenching Method

MA Yan

2015, (1): 28-31.

Abstract(1271)

PDF(13)

Abstract:
A review on the analytical application of resonance Rayleigh scattering (RRS) quenching method for the determination of proteins, nucleic acids, pharmaceuticals and metals is presented. Based on the principles of RRS enhancement, the phenomena and reasons of RRS quenching effect are summarized, and a new idea for establishing a new RRS quenching method is proposed. :O657.3

Analysis of Pb,Cd,Cr(Ⅲ), Cr(Ⅵ) Contents in Ink and Paints

GUAN Yan-yan, LAI Zhi-hui, LI Xiao-yan, WANG Su-juan, ZHANG Yuan-he, ZHAO Jiang-tao, ZHOU Jia-xin

2015, (1): 32-36.

Abstract(1289)

PDF(17)

Abstract:
A method for the determination of Pb, Cd, Cr(Ⅲ), Cr(Ⅵ) in paints and ink is developed. The contents of Pb, Cr, Cd in Paints and ink were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). The precision of the method was less than 6% and the recovery rates were between 96.2%~100.2%. The contents of Cr(Ⅵ) in paints and ink were determined by diphenylcarbazide spectrophotometry. The spiket recovery rate was between 80.0%~90.0%. X-ray photoelectron spectroscopy results showed that chromium in ink is the trivalent chromium. Experimental results showed that the elements in ink were: Pb<0.2 mg/kg, Cd<0.04 mg/kg, Cr(Ⅵ)<2.00 mg/kg. All contents of cadmium in paints were less than 6.00 mg/kg which accorded with ASTM F963-2011, the Ameriscan Standard for toy products. The contents of lead in 6 paints were more than 90 mg/kg. The content of Cr(Ⅵ) in one paint was up to 1.33×10⁴ mg/kg not accorded with that of ASTM F963-2011. The detection limits of Pb、Cd、Cr(Ⅵ) were 0.04,0.2,2.0 mg/Kg.

Determination of Benzene in Drinking Water by Automated Headspace Gas Chromatography and Solvent Extraction Gas Chromatography

HAO Ping, LI Zhong-qin

2015, (1): 37-41.

Abstract(1236)

PDF(22)

Abstract:
Benzene in drinking water was analyzed by the automated headspace gas chromatography, gas chromatography conditions and headspace conditions were optimized, and compared with the solvent extraction method specified in the National Standard GB/T5750.8-2006. The automatic headspace gas chromatographic method has good linearity in the range of 0.00~105.00 μg/L, the correlation coefficient was better than 0.999, with a lowest detection limit of 0.0 042 mg/L, the recovery rate was 96.2%~98.7%, the relative standard deviation of 0.70%. The experimental results showed that the automatic headspace gas chromatography is more convenient, accurate, sensitive, with less disturbance.

Determination of Heavy Metals Elements Copper, Lead, Zinc, Arsenic, Antimony, Cobalt, Chromium, and Nickel in Soil by X-ray Fluorescence Spectrometry with Powder Pelleting

LIU Jiang-bin, DANG Liang, YIN Tao-gang, ZHU Jian-guo

2015, (1): 42-46.

Abstract(1512)

PDF(39)

Abstract:
A method for the simultaneous determination of 8 heavy metals elements (Copper, lead, zinc, arsenic, antimony, cobalt, chromium and nickel)in soil by X-ray fluorescence spectrometry using powder pelleting preparation has been developed. The national standard material for soil and self-prepored standard reference materials were use to build the calibration curve solved the problem of insufficient related standards, and broadened the scope of element determination (10~20 000 μg/g). The measuring conditions of arsenic and antimony is discussed, although the detection limit and precision determination lower limit for these element are rather high, it has important referential significance for soil quality evaluation. The method is rapid, simple and accurate.

Analysis of Wood Chips by PY-GC/MS

SHE Xiao-fan, LI Xin-qian, ZHANG Hai-peng

2015, (1): 47-53.

Abstract(1189)

PDF(16)

Abstract:
Wood chips are the trace evidence in various criminal and traffic accident cases. Because of their complex chemical composition, and because the difference among their indissoluble macromolecular componeats is indistinctive no effective identification method has been established. In this paper, PY-GC/MS technology has been adopted to analyze different kinds of wood chips. The results showed that total ion current chromatograms of different wood chips are simila, i. e,there are a group of characteristic components in every total ion current chromatograms of indissoluble componeats of wood chips, but there are differences among the individual components.

Application of Back Scattered Electron Imaging Function in Scanning Electron Microscopy

FENG Shan-e, GAO Wei-jian

2015, (1): 54-57.

Abstract(1946)

PDF(62)

Abstract:
The basic principle and application of the back scattered electron (BSE) images of scanning electron microscope (SEM) is described. BSE imaging combined with X-ray energy dispersive spectrum of SEM was used to study the composition changes in the micro areas of samples, so as to understand the composition and structure characteristics of samples in a short time, thus providing an effective analysis method for the phase identification.

Improvement of Sample Pre-Treatment Technology for Determining Copper in Coal Gangue by Flame Atomic Absorption Spectrometry

ZHANG Hui-song, ZHU Zhen-zhong, FAN Xiang-juan, CHEN Fei, XIE Chao

2015, (1): 58-61.

Abstract(1130)

PDF(23)

Abstract:
Determination of copper in coal gangue was analyzed by flame atomic absorption spectrometry. The method of sample pretreatment was reserched, digestion conditions and instrument conditions were optimized, the corresponding determination of atomic absorption spectrometry was established. RSD of the method was between 1% to 3%,the recovery was 96.5%~104%.

2015 No. 1

NewsMORE+

LinksMORE+

Journal Online

Reader Center

Links