Abstract
A method has been developed for the determination of diphenylarsinic acid (DPAA) and phenylarsonic acid (PAA) in water samples by high-performance liquid chromatography with inductively coupled plasma mass spectrometry. DPAA and PAA could be separated from five arsenic species {As(III), As(V), monomethylarsonic acid, dimethylarsinic acid and trimetylarsine oxide} by using a column packed with hydrophilic-resin-based cation-exchange resin and a gradient elution with nitric acid-ammonium nitrate. Good linearity (coefficient of correlation ≥ 0.998) of the calibration curve was obtained in the concentration range from 2 μg/l to 200 μg/l for DPAA and PAA. In addition, a solid-phase extraction method was developed to concentrate DPAA and PAA. The recoveries of DPAA and PAA from spiked groundwater samples were nearly 100% and the coefficients of variation were 2.6∼2.9 %(n = 5).
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