Arsenic speciation by ion-exchange separation and graphite-furnace atomic-absorption spectrophotometry.
As(III), As(V), monomethylarsenic acid (MMA) and dimethylarsenic acid (DMA) were determined by graphite-furnace atomic-absorption spectrophotometry after separation of the species by ion-exchange chromatography. The detection limits (ng/ml) were DMA 0.02, MMA 2.0, As(V) 0.4 and total arsenic 4.0. As(III) was determined by difference. This system gave better detection limits and/or shorter analysis times than previously reported systems.
Pacey
G E
GE
Miami University, Department of Chemistry, Oxford, Ohio 45056, U.S.A.
Ford
J A
JA