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Original PaperSpeciation of arsenic by ion chromatography inductively coupled plasma mass spectrometry using ammonium eluents 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 NH 4 H 2 PO 4 , (NH 4 ) 2 HPO 4 , (NH 4 ) 2 CO 3 , and NH 4 HCO 3 , 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 (NH 4 ) 2 HPO 4 at pH 7.9. The detection limits for the target arsenic species ranged from 0.1 to 0.4 lg/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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