A method for the simultaneous determination of arsenite[As(Ⅲ)],dimethyl arsenic (DMA),monomethyl arsenic (MMA) and arsenate[As(Ⅴ)]in surface water using liquid chromatography-atomic fluorescence spectrometer (LC-AFS) was established. With 10 mmol/L diammonium hydrogen phosphate solution as the mobile phase,the samples were filtered through 0.45 μm aqueous microporous filter membrane,and 4 arsenic specition were separated by an anion chromatographic column,qualitative and quantitative analysis were achieved using atomic fluorescence spectrometer. The results showed that the linearity of the 4 arsenic specition were good in the range of 0～100 μg/L,and the correlation coefficients were all greater than 0.999. The limits of detection of As(Ⅲ),DMA,MMA,and As(Ⅴ) were 0.31,0.41,0.53,and 0.81 μg/L respectively,and the relative standard deviations (RSD) ranged from 1.01％～3.83％ (n=6). The spiked recoveries ranged from 90.41％～105.90％. The method is simple and easy to implement,highly accurate,and can be used for the determination 4 arsenic specition in surface water.
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