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本文以氢化物发生原子吸收光谱法测定铅锑合金中的砷为例,讨论了十六种金属离子的干扰,比较了两种不同原子化方法的灵敏度和干扰程度。采用电加热石英管原子化法时,为了消除锑对砷的严重干扰,用高锰酸钾溶液分解锑化氢,得到的相对检测限为0.0001％。采用氩-氢火焰原子化法时,由于万倍以下的锑对砷没有干扰,可以直接分析,得到的相对检测限为0.00005％。
In this paper, the determination of arsenic in lead-antimony alloy by hydride generation atomic absorption spectrometry was taken as an example. The interference of sixteen kinds of metal ions was discussed. The sensitivity and interference degree of two different methods of atomization were compared. When using the electric heating quartz tube atomization method, in order to eliminate the serious interference of antimony to arsenic, the relative detection limit of 0.0001% was obtained by decomposing the antimony hydride with potassium permanganate solution. When argon-hydrogen flame atomization method is adopted, the antimony of ten thousand times or less has no interference with arsenic, and can be directly analyzed with the relative detection limit of 0.00005%.