Determination of As(III) and As(V) in water samples by hydride generation atomic fluorescence spectrometry with ion exchange technique

A method was described for the separation and determination of arsenic species (arsenite, arsenate) by hydride generation-atomic fluorescence spectrometry(HG-AFS)combined with an ion exchange technique. The experimental conditions including pH value and the flow rate of solution, the concentration of stripping agent and the conditions that influenced the fluorescence intensity were investigated and optimized. Under optimum conditions the detection limit for arsenic was 0.096 μg/L and the relative standard deviation was 2.1%. The proposed method was applied to the determination of arsenite and arsenate in water samples with a recovery range of 94.7%～107.9%.