Journal
ANALYTICA CHIMICA ACTA
Volume 521, Issue 1, Pages 99-108Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2004.05.032
Keywords
arsenic; speciation; ion chromatography; atomic fluorescence spectrometry; photooxidation; marine samples
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The optimisation of an on-line decomposition based on UV photooxidation for the analysis of organoarsenic species by coupling cation-exchange chromatography and atomic fluorescence spectrometry with hydride generation, is described. In this study, special consideration is given to the compatibility of mobile phases with post-column treatments. Results show that the most commonly used mobile phase, aqueous pyridine solutions, decreases species conversion efficiency, leading to a significant loss of sensitivity. New fully-compatible chromatographic conditions are proposed to separate arsenobetaine, arsenocholine, trimethylarsine oxide and tetramethylarsonium ion within 20 min. The very low absolute limits of detection, 4-12 pg(As), allow speciation at trace levels. Analysis of a certified reference fish tissue (DORM-2) and other seafood samples (French and Chilean oysters and mussel) highlights the robustness and the accuracy of the optimised system. (C) 2004 Elsevier B.V. All rights reserved.
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