应用化学 ›› 1993, Vol. 0 ›› Issue (1): 80-82.

• 研究简报 • 上一篇    下一篇

氢化物发生-光度分析法连续测定砷锡

汪炳武, 陈姚, 牛建军   

  1. 中国科学院长春应用化学研究所 130022 长春
  • 收稿日期:1991-11-20 修回日期:1992-03-14 出版日期:1993-02-10 发布日期:1993-02-10

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

Wang Bingwu, Chen Yao, Niu Jianjun   

  1. Changchun Institute of Applied Chemistry, Academia Sinica, 130022 Changchun
  • Received:1991-11-20 Revised:1992-03-14 Published:1993-02-10 Online:1993-02-10

摘要: 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AsH3和SnH4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AsH3逸出分析后,再调节至微酸性(pH 4.5,CH3COOH-CH3COONa)产生SnH4,而显色测定,达到连续测定砷、锡的目的。

关键词: 砷, 锡, 氢化物发生, 光度分析法

Abstract: 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 AsH3 and SnH4 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.

Key words: arsenic, tin, hydride generation, spectrophotometry