氢化物发生-原子荧光光谱法同时测定环境水中的砷和汞的研究

本文研究了用氢化物发生。原子荧光光谱法同时测定环境水中砷和汞.本法是在盐酸介质中，以硼氢化钾作还原剂，将待测元素转化为挥发性氢化物，以高纯氩气作为载气将挥发性氢化物从溶液中分离，并导入石英炉原子化器中原子化．以高效空心阴极灯作激发光源，被测元素原子受激发后发出原子荧光，荧光强度在一定范围内与被测元素的浓度成正比．讨论并确定了试验的最佳测定条件，方法的检出限：As为0．018μg／L，Hg为0．006μg／L，对As、Hg混合标准溶液（As：5ppb，Hg：0．5ppb）连续测定11次，相对标准偏差：As为2．4％，Hg为10％．并对不同来源的水样进行了分析，回收率为95％～110％．结果表明，该方法操作简便、灵敏度高、干扰少．

Simultaneous determination of arsenic and mercury in water by hydride generation-atomic fluorescence spectrometry

An HG-AFS method for the determination of arsenic and mercury in effluents of river water is described in this paper An intermittent flow injection system is used for the generation of hydride of arsenic or mercury. The hydride generated is separated from the solution and led into the quartz atomizer of the AFS-instrument. The hydride generated is atomized and emit atomic fluorescence. The optimum conditions for the determination are tested and discussed. The limit of detection of this method is found to be 0.018μg/L for As, 0.006μg/L for Hg. The RSD of this method is found to be 2.4% for As,10% for Hg. The recovery is found to be 90%-110% and it could be concluded that the present method is simple, sensitive and credible.