检索结果-南通市图书馆

Journal of Environmental Sciences 2004年第5期16卷 813-815页

作者： YUXue-chun HEKe-bin MAYong-liang YANGFu-mo DUANFeng-kui ZHENGAi-hua ZHAOCheng-yi DepartmentofEnvironmentalScienceandEngineering TsinghuaUniversityBeijing100084China AnalyticalandTestingCenter BeijingNormalUniversityBeijing100875China

A simple, sensitive and convenient ion chromatography(IC) method was established for the simultaneous determination of twelve water-soluble inorganic anions(F -, Cl -, NO - 2, NO - 3, SO 2- 3, SO 2- 4, PO 3- 4), and fifteen water-soluble organic ions(formate, acetate, MSA, oxalate, malonate, succinate, phthalates, etc.) in atmospheric aerosols. The linear concentrations ranged from 0.005 μg/m 3 to 500 μg/m 3(r = 0.999—0.9999). The relative standard deviation(RSD) were 0.43%—2.00% and the detection limits were from 2.7 ng/m 3 to 88 ng/m 3. The proposed method was successfully applied to the simultaneous determination of those inorganic ions and organic ions in PM 2.5 of Beijing.

关键词： ion chromatography water-soluble ions aerosols Beijing

Electrocatalytic Oxidation and ion chromatography Detection of S_2O^(2-)_3, SO^(2-)_3, I^- and SCN^- at Glassy Carbon Electrode with Functionalized Multi-Wall Carbon Nanotubes Film

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2004年第5期20卷 529-533页

作者： XUJi-ming WANGYan-ping XIANYue-zhong JINLi-tong DepartmentofChemistry HuaiyinTeachersCollegeHuaiyin223001P.R.China DepartmentofChemistry EastChinaNormalUniversityShanghai200062P.R.China

In this research, a glassy carbon electrode modified with the functionalized multi-wall carbon nanotubes(MWNT-COOHs) film was used as an amperometric sensor for the determination of S_2O^(2-)_3, SO^(2-)_3, I^- and SCN^-. The electrochemical behavior of those oxidizable inorganic anions at this modified electrode was studied by means of cyclic voltammetry(CV). The experimental results indicate that the modified electrode exhibits a high electrocatalytic activity towards the oxidation of those anions with a relatively high sensitivity, a good stability and a long-life. Separated by ion chromatography(IC) with 1.25 mmol/L H_2SO_4 as an eluent, those oxidizable anions can be determined by the MWNT-COOHs modified electrode successfully. Under the optimal chromatographic conditions, the detection limits are 1.5×10^(-7) mol/L for S_2O^(2-)_3, 2.5×10^(-7) mol/L for SO^(2-)_3, 1.2×10^(-7) mol/L for I^- and 2.0×10^(-7) mol/L for SCN^-, respectively. The method was applied successfully to the determination of those anions in environmental water

关键词： Amperometric detection MWNT-COOHs Chemically modified electrode ion chromatography

Study on Determination of Chemical Oxygen Demand in Water with ion chromatography

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2007年第2期25卷 228-232页

作者：张中海丁红春方艳菊鲜跃仲金利通 Department of Chemistry East China Normal University Shanghai 200062 China

A new method for determining chemical oxygen demand （COD） value in water using ion chromatography coupled with nano TiO2-K2S2O8 co-existing system was described. The photocatalytic oxidation system and nano TiO2-K2S2O8 co-existing system could degrade the organic compounds in water. All sulfur-containing species in the reactive solution were eventually transformed to sulfate which could be determined by conductivity detector in ion chromatography. The change of conductivity of sulfate was proportional to COD value. The optimal experimental conditions and the mechanism of the detection were discussed. The application range was 10.0-300.0 mg·L^-1 and the lowest limit of detection was 3.5 mg·L^-1. It was considered that the value obtained could be reliably correlated with the COD value obtained using the conventional methods.

关键词： ion chromatography chemical oxygen demand nano TiO2-K2S2O8

Application of Nafion/Cobalt Hexacyanoferrate Chemically Modified Electrodes for the Determination of Electroinactive Cations by ion chromatography

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2002年第8期20卷 771-776页

作者：徐继明鲜跃仲施国跃李金花金利通 Department of chemistry East China Normal University Shanghai 200062 China

An amperometric detector based on the chemical modification of Nafion and cobalt(II) hexacyanoferrate(II,III) thin film (Nafion/Co CN Fe) onto a glassy carbon (GC) electrode was firstly developed for the determination of electroinactive cations (Li +, Na +, K +, Rb +, Cs + and NH + 4) in single column ion chromatography. A set of well defined peaks of electroinactive cation was obtained. The relative standard deviations (RSDs) of chromatographic peak height (nA) for these cations were all below 3.8%. The cations were detected conveniently in the linear concentration range of 6.0×10 -6 -5.0×10 -3 mol/L and their correlation coefficients were all above 0.99. The detection limits of the cations were 9.2×10 -6 mol/L for Li +, 3.4×10 -6 mol/L for Na +, 6.3×10 -7 mol/L for K +, 7.8×10 -7 mol/L for Rb +, 6.2×10 -7 mol/L for Cs + and 6.2×10 -6 mol/L for NH + 4, at a signal noise ratio of 3. The method was quick, sensitive, simple and was successfully applied to the analysis of rainwater samples. The electrode was stable for a 2 week period of operation with no evidence of chemical or mechanical deterioration.

关键词： ion chromatography electrochemical detection water analysis

Determination of common anions in oxalate by ion chromatography coupled with UV photolysis pretreatment

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2012年第11期23卷 1263-1266页

作者： Sheng Lin Cao Ming Li Ye Wei De Lv Guang Wen Pan Ting Ting Zhang Zhong Yang Hu Li Na Liang Yan Zhu Department of Chemistry Zhejiang UniversityHangzhou 310028China Shanghai Lab Thermo Fisher Scientific Inc.Shanghai 201203China Hangzhou Vocational and Technical Institute Hangzhou 310018China

A new and simple method was developed to determine anions in oxalate of analytical reagent grade. After UV photolysis with optimal 1% H2O2 in 10,000 mg/L oxalate in the fabricated photoreactor, sample was directly injected into IC system. Satisfactory linearity, detections limits, good repeatability and spiked recovery were obtained. The method was successfully applied to determine anions in two commercial oxalate samples.

关键词： ion chromatography UV photolysis Oxalate Common anions

Determination of levels of adenosine phosphates in blood by ion chromatography

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2011年第12期22卷 1485-1488页

作者： Pei Jin Xie Ming Li Ye Zhong Yang Hu Guang Wen Pan Yan Zhu Jia Jie Zhang Department of Chemistry Zhejiang UniversityHangzhou 310028China Shanghai Lab Dionex China Co.Ltd.Shanghai 201203China

A new method was developed for simultaneous determination of levels of AMP,ADP and ATP in blood by anion-exchange *** three adenosine phosphates were separated by Dionex ionPac AG18（50 mm×4 mm） guard column and ionPac AS 18（250 mm×4 mm） analytical column using a gradient method and detected with a suppressed conductivity detector. The detection limits（S/N=3） of AMP,ADP and ATP were 38,47,108 ng/L,*** relative standard deviations of retention time,peak area and peak height were all less than 1.87%and a good linear relationship was *** method was applied to analyze human blood samples.

关键词： Adenosine phosphate ion chromatography Blood

Speciation Analysis of Arsenic Compounds in Seafood by ion chromatography-Atomic Fluorescence Spectrometry

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2017年第3期16卷 455-460页

作者： HAN Tingting JI Hongwei LI Huixin CUI He Song Tian DUAN Xiaojuan ZHU Qianlin CAI Feng ZHANG Li College of Chemistry and Chemical Engineering Ocean University of China Qingdao 266100 P. R. China Shandong Entry-Exit Inspection and Quarantine Technology Center Qingdao 266002 P. R. China Qingdao Entry-Exit Inspection and Quarantine Bureau Qingdao 266001 P. R. China School of Science Yanshan University Qinhuangdao 066004 P. R. China

ion chromatography-ultra violet-hydride generation-Atomic Florescence Spectrometry was applied to detect 5 arsenic species in seafoods. The arsenic species studied include arsenobetaine(As B), arsenite(As(III)), dimethylarsinic acid(DMA), monomethylarsonic acid(MMA), and arsenate(As(V)), which were extracted from samples using 2% formic acid. Gradient elution using 33 mmol L^(-1) CH_3COONH_4 and 15 mmol L^(-1) Na_2CO_3 with 10 mL CH_3CH_2OH at pH 8.4 allowed the chromatographic separation of all the species on a Hamilton PRP-X100 anion-exchange column in less than 8 min. In this study, an ultrasound extraction method was used to extract arsenic species from seafood. The extraction efficiency was good and the recoveries from spiked samples were in the range of 72.6%–109%; the precision between sample replicates was higher than 3.6% for all determinations. The detection limits were 3.543 μg L^(-1) for As B, 0.4261 μg L^(-1) for As(III), 0.216 μg L^(-1) for DMA, 0.211 μg L^(-1) for MMA, and 0.709 μg L^(-1) for As(V), and the linear coefficients were greater than 0.999. We also developed an application of this method for the determination of arsenic species in bonito, Euphausia superba, and Enteromorpha with satisfactory results. Therefore, it was confirmed that this method was appropriate for the detection of arsenic species in seafood.

关键词： arsenic species seafood ion chromatography atomic fluorescence spectrometry

Determination of anions in lithium-ion batteries electrolyte by ion chromatography

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2016年第6期27卷 864-866页

作者： Bin-He Zhu Cheng-Zhu Ni Na-Ni Wang Xun-Yan Zhao Wei-Qiang Guo Pei-Min Zhang Jia-Jie Zhang Su-Qing Chen Wei-De Lv Yan Zhu Department of Chemistry Xixi Campus Zhejiang University Hangzhou 310028 China Department of Medicine Zhejiang Academy of Traditional Chinese Medicine Hangzhou 310007 China School of Pharmaceutical and Chemical Engineering Taizhou University Taizhou 317000 China Hangzhou Vocational & Technical College Hangzhou 310018 China

A sensitive and accurate method based on ion chromatography was established for determination of five lithium salts in lithium-ion batteries electrolytes. Chromatographic analyses were carried out on an anion exchange column at flow rate of 1 m L/min. Under the optimal conditions, five target anions（BF4^-,PF6^-, TFSI^-, BOB^-and FSI^-） exhibited satisfactory linearity with a correlation coefficient of 0.9996. The relative standard derivations of the target anions were less than less than 0.94%（n = 7）. The limits of detections were in the range of 0.068–0.29 mg/L with average spiked recoveries ranging from 96.8% to 105.1%.

关键词： ion chromatography Lithium salts Lithium-ion batteries electrolyte

Simultaneous determination of fluorine and iodine in urine by ion chromatography with electrochemical pretreatment

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2009年第12期20卷 1483-1486页

作者： Kang Kang Hu Wei Xiong Huang Yu Hua Su Rong Zong Hu Department of Chemistry College of Chemistry and Chemical Engineering and The Key Laboratory of Analytical Sciences of the Ministry of Education Xiamen University Xiamen 361005 China

A new method for the simultaneous determination of fluorine and iodine in urine by ion chromatography （IC） with electrochemical pretreatment has been developed. The pretreatment was performed in a novel electrochemical oxidationneutralization device （EOND）, in which iodide of the sample was oxidized to iodate and the alkaline digestion sample solution was neutralized. Under the optimized conditions, the limits of detection （LOD, S/N = 3） were 2.5 μg/L for fluoride and 20 μg/L for iodate, respectively. The recoveries were in the range of 93-102% for fluoride and 86-98% for iodate.

关键词： Fluorine Iodine Urine Electrochemical pretreatment ion chromatography

Determination of inorganic anions in ethyl acetate by in-line hollow fiber membrane extraction with ion chromatography

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2009年第12期20卷 1498-1501页

作者： Zhen Zhen Hu Ying Ying Zhong Yun Chang Fan Yan Zhu Department of Chemistry Xixi Campus Zhejiang University Hangzhou 310028 China

In this work, a novel hollow fiber membrane extractor was set up to extract inorganic anions from ethyl acetate using deionized water. Inorganic anions in slightly soluble organic solvents can be determined by the in-line hollow fiber membrane extractor coupled with ion chromatography at first time. Different aspects of the extraction procedure such as magnetic stirring speed, extraction flow rate and extraction time were optimized to achieve high extraction efficiency and good separation results. Satisfactory linear range, limits of detection and good repeatability were obtained. The procedure was applied to analyze inorganic anions in two commercial ethyl acetate samples.

关键词： Inorganic anions Ethyl acetate In-line hollow fiber membrane extraction ion chromatography