Journal
TALANTA
Volume 119, Issue -, Pages 202-206Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2013.11.016
Keywords
Inorganic arsenic; Rice; SPE; Speciation; Hydride generation; Atomic fluorescence spectrometry
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Due to high toxicity, inorganic arsenic (iAs) species are the focus of monitoring effort worldwide. In this work arsenic was first extracted from rice by microwave-assisted digestion in HNO3-H2O2, during which As-III was oxidized to As-V. Silica-based strong anion exchange cartridges were used to separate As-V from organic forms. After prereduction by iodide, iAs was quantified by hydride-generation atomic fluorescence spectrometry (HG-AFS). This method achieved 1.3 ng g(-1) limit of detection (LOD), and 94 +/- 3% and 93 +/- 5% recoveries, respectively, for As-III and As-V at 100 ng g(-1). Validation was performed using standard reference material NIST 1568a (102 ng g(-1)) and ERM BC211 (124 ng g(-1)) rice flour. By eliminating chromatography, SPE speciation gained throughput and cost advantages. HG-AFS, at 10% budget and operation cost of a typical inductively-couple plasma mass spectrometer (ICPMS), proved highly sensitive and specific for iAs quantification. Published by Elsevier B.V.
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