采用氢化物发生-原子荧光光谱法测定环境水中砷和汞。在盐酸（5＋95）溶液中加入溶于10g.L-1氢氧化钾溶液中的15g.L-1硼氢化钾溶液使与溶液中的砷离子反应生成砷的氢化物及汞原子。分析中采用载气及屏蔽气的流量依次为400mL.min-1及800mL.min-1。试样溶液中加入硫脲作为预还原剂。于仪器中引入取样量为1.0mL的试样溶液,按选定的工作条件操作。荧光强度与砷及汞的质量浓度均在0.50～50.0μg.L-1和0.05～5.00μg.L-1范围内呈线性关系,方法的检出限（3S/N）依次为砷0.045μg.L-1和汞0.011μg.L-1。应用此方法对环境水进行分析,测得砷和汞的回收率分别在96.8%～100.4%和98.6%～100.2%之间。%HG-AFS was applied to the simultaneous determinations of arsenic and mercury in environmental water.Hydrides of As and atomic Hg were generated from HCl（5＋95） solution by reacting with 15 g·L-1 KBH4 solution（dissolved in 10 g·L-1 KOH solution）.Flow-rates of 400 mL·min-1 for carrier gas and 800 mL·min-1 for shielding gas were taken in the analysis.Solution of thiourea 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 Hg found were in the ranges of 0.50-50.0 and 0.05-5.00 μg·L-1,with detection limits（3S/N） of 0.045 μg·L-1 and 0.011 μg·L-1,respectively.The proposed method was applied to the analysis of samples of environmental water,giving values of recovery found were 96.8%-100.4% for As and 98.6%-100.2% for Hg.
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