Journal
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
Volume 24, Issue 4, Pages 376-384Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b820300h
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Funding
- National Science Foundation [0316181]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0316181] Funding Source: National Science Foundation
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Several procedures, involving various solvents and ultrasound, were evaluated for the extraction of four arsenic species, arsenite (As(III)), arsenate (As(V)), monomethylarsonate (MMA) and dimethylarsinate (DMA), from a silt loam soil to which species had been added at a concentration of 20 mg kg(-1). The best extraction was by a two-stage procedure: shaking for 24 h in the presence of 0.1 mol l(-1) phosphoric acid followed by shaking for 24 h in 1.0 mol l(-1) sodium hydroxide solution. The arsenic species in the extracts were separated by high performance ion-exchange liquid chromatography, derivatized to hydrides by reaction with tetrahydroborate(III) in a multi-mode sample introduction system (MSIS) and quantified by ICP-OES. Detection limits in solution ranged from 0.4 (As(III) and DMA) to 1 (MMA and As(V)) mu g l(-1), corresponding to 10 and 25 mu g kg(-1) in a 0.2 g soil sample and 5 ml of extractant. The most significant change over time was that As(III) was converted to As(V). When each species was added individually, arsenic was 100% recovered over a period of several months. When all four species were added together, the recovery was 89%. As the precipitation of humic acids was slow, the sodium hydroxide extract could be acidified and analyzed without loss of analyte species.
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