Simultaneous Determination of As and Sb in Drinking Water by HG-AFS

HG-AFS was applied to the simultaneous determinations of arsenic and antimony in drinking water.Hydrides of As(Ⅲ) and Sb(Ⅲ) were generated from HCl(1+9) solution by reacting with KBH4 solution as reductant.Flow-rates of 400 mL·min-1 for carrier gas and 800 mL·min-1 for shielding gas were taken in the analysis.Mixed solution of thiourea and ascorbic acid was added to the water sample as pre-reductant.One mL of sample solution was introduced and operated under the prescribed working condition of the instrument.Linear relationships between the fluorescence intensity and mass concentration of As and Sb were found same in the range within 10.0 μg·L-1,with detection limits (3S/N) of 0.087 μg·L-1 and 0.048 μg·L-1 ,respectively.The proposed method was applied to the analysis of sample of drinking water,giving values of recovery found were 90.5%-93.3% for As and 92.5%-95.3% for Sb.