Speciation 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 NH4H2PO4, (NH4)2HPO4, (NH4)2CO3, 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)2HPO4 at pH 7.9. The detection limits for the target arsenic species ranged from 0.1 to 0.4 microg/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.
Chen
ZuLiang
Z
Centre for Environmental Risk Assessment and Remediation, University of South Australia, Mawson Lakes Campus, Mawson Lakes, South Australia, Australia. zuliang.chen@unisa.edu.au
Akter
Kazi Farzana
KF
Rahman
Mohammad Mahmudur
MM
Naidu
Ravendra
R
D001151:Arsenic / Q000737:chemistry* / Q000145:classification; D002852:Chromatography, Ion Exchange; D013058:Mass Spectrometry; D000644:Quaternary Ammonium Compounds
D000644:Quaternary Ammonium Compounds; D001151:Arsenic