用氢化物-原子荧光法测定水处理剂中微量砷

Determination of trace arsenic in water treatment reagent by hg-afs

目的：建立氢化物-原子荧光法测定水处理剂聚合氯化铝和硫酸铝中砷的方法。方法：选择最佳测定条件，确定适宜的酸介质和酸度，并对共存离子的干扰进行了研究。结果：方法的最低检出限为0．1ng／ml，方法的相对标准偏差为5．87％以下，平均回收率为93．3％～102％。结论：方法简便、快速、准确可靠、重复性好，灵敏稳定干扰少。

Objective：To establish a method of hydride generation - atomic fluorescence spectrometer （ HG - AFS） for the determination of arsenic in poly- aluminium sulfate and poly- aluminium chloride. Methods：The best measurement conditions was selected, an appropriate acidic medium and acidity were defined and interferences of the coexisting ions were studied. Results： Detection limit of the method was 0. 1 ng/ml, the relative standard deviation was below 5. 87% and average recovery was in the range of 93.3% - 102%. Conclusion：The method is proved to be simple, rapid, steady and of high accuracy.