Arsenic Speciation by Ion-Pair Reversed-Phase Liquid...

Published: Journal of Chromatographic Science, Volume 34, Number 5, May 1996, pp. 226-229.

Arsenic Speciation by Ion-Pair Reversed-Phase Liquid Chromatography with Coupled Amperometric and Ultraviolet Detection
P. Boucher, M. Accominotti, and J.J. Vallon

An ion-pair reversed-phase liquid chromatographic method is used to separate As(III), As(V), arsenobetaïn, arsenocholin, monomethylarsonic, and dimethylarsonic acids in a single run on a common C₁₈ stationary phase with coupled amperometric and ultraviolet detection. As(III) is not separated from arsenobetaïn, but only As(III) is detected by amperometry. The calibration curves of the tested species are linear from 0.5 to 3 µmol/L. Coefficient of variation values for intra-assay precision range between 2.5% and 9.2%. The limit of quantitation ranges from 0.1–1 µmol/L, depending on the species concerned.

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