【摘要】 本文详细介绍了氢化物发生—加热石英管原子吸收光谱法测定底质(水底沉积物)中砷的方法.首先将试样进行预处理,形成砷离子溶液,然后将还原剂硼氢化钾加入到含有砷离子的酸性溶液中,反应生成游离氢和易挥发的砷化氢.氢气流将砷化氢吹入加热石英管,进行分解并测定砷的吸收.石英管加热到900～1000℃.该方法灵敏度高,检测限和回收率分别为0.0057mg/kg和95～106%.更多还原

【Abstract】 The method of detemination of arsenic in river Sediment by atomic absorption spectrophotometry with hydride generation-heating quarty tube is described in this paper. For determining arsenic element that may form volatile hydrides, the samples are first pre-treated to form the solutions which arsenic ion is borne in, then a reductant KBH₄ is dispensed into the sample solution in which arsenic ion reacts with the reductant to liberate hydrogen and volatile hydride. The hydrogen stream flushes the hydride into the heated quarty tube where it is decomposed and the absorption of the arsenic is measured. The tube is heated to between 900℃ and 1000℃. The sensitivity of the method is high. The detection limit and recovery percent age are 0.0057mg/kg and 95～106%,respectively.更多还原