Journal
JOURNAL OF SEPARATION SCIENCE
Volume 29, Issue 17, Pages 2671-2676Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.200500304
Keywords
ammonium salts; arsenic speciation; IC-ICPMS; water and soil
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A method based on ion chromatography (IC) and inductively coupled plasma MS (ICP-MS) was developed for the speciation of arsenic in water and soil extracts. An anion-exchange column (G3154A/101) was used to separate As(III), As(V), dimethylarsinic acid (DMA), and monomethylarsonic acid (MMA) with excellent resolution. Various ammonium salts, including NH4H2PO4, (NH4)(2)HPO4, (NH4)(2)CO3, and NH4HCO3, were examined as eluents to reduce matrix interference from chloride and to solve clogging problems. The best arsenic speciation was obtained within 9 min with excellent resolution and without interference from high chloride concentrations using an eluent containing 7.5 mM (NH4)(2)HPO4 at pH 7.9. The detection limits for the target arsenic species ranged from 0.1 to 0.4 mu g/L with direct injection of sample without matrix elimination. The proposed method was effectively demonstrated by determining arsenic species in contaminated waters and soils of Bangladesh.
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