氢化物发生—光度分析法连续测定砷锡

锗、砷、锡、锑等性质相近元素在用普通分光光度法测定时,存在着选择性差的问题,为实际分析及连续测定造成了困难。共价氢化物发生-银溶胶光度分析体系的建立和发展,基本解决了此类元素的选择性问题,也为同时或连续测定创造了条件。本文在原工作的基础上,借助于AsH_3和SnH_4在形成酸度上的差异,在高酸度(3.0mol/L HCI)溶液中使砷离子转变为AsH_3逸出分析后,再调节至微酸性(pH 4.5,CH_3COOH-CH_3COONa)产生SnH_4,而显色测定,

CONTINUOUS DETERMINATION OF ARSENIC AND TIN BY HYDRIDE GENERATION-SPECTROPHOTOMETRY TECHNIQUE

For continuous determination of arsenic and tin a new method consisted of the hydride generation-silver sol spectrophotometry has been proposed. The separation of As and Sn was achieved in the form of AsH_3 and SnH_4 in 3. 0 mol/L HCI and in a medium of pH 5. 5, respectively from the same solution. With a hydride separator which eliminates the interference of other covalent hydrides, the method is characterized by high sensitivity, selectivity and applicability. Satisfactory results were obtained in analysing pure lead,ferrotungsten alloy,ore, and sediments.