| Flow injection on-line sorption preconcentration coupled with hydride generation atomic fluorescence spectrometry for determination of (ultra)trace amounts of arsenic(III) and arsenic(V) in natural water samples. | |
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MedLine Citation:
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PMID: 12033321 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A flow injection on-line sorption preconcentration and separation in a knotted reactor (KR) was coupled to hydride generation atomic fluorescence spectrometry (HG-AFS) for speciation of inorganic arsenic in natural water samples. The method involved on-line formation of the As(III)-pyrrolidinedithiocarbamate (PDC) complex over a sample acidity of 0.001-0.1 mol L(-1) HCl, its adsorption onto the inner walls of the KR made from 150-cm long x 0.5-mm i.d. PTFE tubing, elution withmol L(-1) HCl, and detection by HG-AFS. Total inorganic arsenic was determined after prereduction of As(V) to As(III) with 1% m/v L-cysteine. The concentration of As(V) was calculated by the difference of the total inorganic arsenic and As(III). A 1 mol L(-1) concentration of HCl was employed not only as the efficient eluent but also as the required medium for subsequent hydride generation. Potential factors that affect adsorption, rinsing, elution, and hydride generation were investigated in detail. The low cost, easy operation, and high sensitivity are the obvious advantages of the present system. With consumption of a 6 mL sample solution, an enhancement factor of 11 and a detection limit (3s) of 0.023 microg L(-1) As(III) were obtained at a sample throughput of 32 h(-1). The precision for 14 replicate measurements of 1 microg L(-1) As(III) was 1.3% (RSD). The recoveries from natural water samples varied from 96.7 to 105% for 2 microg L(-1) of As(III) spike and from 97.1 to 107% for 2 microg L(-1) of As(V) spike. The analytical results obtained by the present method for total arsenic in the certified reference materials, SLRS-4 (river water) and NASS-5 (seawater), agreed well with the certified values. The developed method was also successfully applied to the speciation of inorganic arsenic in local natural water samples. |
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Authors:
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Xiu-Ping Yan; Xue-Bo Yin; Xi-Wen He; Yan Jiang |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Analytical chemistry Volume: 74 ISSN: 0003-2700 ISO Abbreviation: Anal. Chem. Publication Date: 2002 May |
Date Detail:
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Created Date: 2002-05-29 Completed Date: 2003-04-04 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0370536 Medline TA: Anal Chem Country: United States |
Other Details:
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Languages: eng Pagination: 2162-6 Citation Subset: IM |
Affiliation:
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Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin, China. xpyan@nankai.edu.cn |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Arsenic
/
analysis,
chemistry Arsenicals / analysis*, chemistry Equipment Design Feasibility Studies Fresh Water / analysis Hydrogen / chemistry Seawater / analysis Sensitivity and Specificity Spectrometry, Fluorescence / instrumentation*, methods, standards Spectrophotometry, Atomic Water / analysis*, standards |
| Chemical | |
Reg. No./Substance:
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0/Arsenicals; 1333-74-0/Hydrogen; 7440-38-2/Arsenic; 7732-18-5/Water |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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