同时测定饮用水中As和Hg的氢化物原子荧光法

Simultaneous Determination of Trace Arsenic and Mercury in Drinking Water by Hydride Generation Atomic Fluorescence Spectrometry

目的建立氢化物原子荧光法同时测定饮用水中As、Hg的方法。方法选择最佳的条件 ,进行样品处理方法及酸度、干扰离子等的研究。结果方法的检出限 :As为0.29ng/ml、Hg 为0.05ng/ml,方法的精密度、相对标准偏差在6.8%以下 ,As、Hg加标回收率分别为85.7 %～112.6 %和86.7 %～113.8 % ,标准物质的测定值和标准值相符。结论该法适用于饮用水中As。

Objective To establish the simultaneous determination of arsenic and mercury in the drinking water by hydride generation atomic fluorescence spectrometry (HGAFS). Methods The contents of trace arsenic and mercury in drinking water were detected by HGAFS based on optimized working conditions in this assay. The influences of some factors, such as sample pretreatment, pH value and interfering ions in drinking water were analyzed also. Results The detection limit of arsenic, mercury was 0.29 ng/ml and 0.05 ng/ml respectively. The precision (relative standard deviation) of the method was less than 6.8% .The recovery rates ranged from 85.7%～112.6%. The detecting results for standard materials were very much close to the reference values. Conclusion This method was suitable for the detection of arsenic and mercury in drinking water.