高等学校化学学报

高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (3): 374.

• 论文 • 上一篇    下一篇

新显色剂对-二甲氨基偶氮氯膦的合成及其与钍显色反应的研究

黄亚励, 刘绍璞   

  1. 西南师范大学环境化学研究所, 重庆 400715
  • 收稿日期:1998-06-17 出版日期:1999-03-24 发布日期:1999-03-24
  • 通讯作者: 黄亚励,女,34岁,硕士,副教授,现在贵阳医学院化学教研室工作.
  • 作者简介:黄亚励,女,34岁,硕士,副教授,现在贵阳医学院化学教研室工作.

Synthesis of the New Reagent of p-Dimethylaminochlorophosphonazo and Its Coloration Reaction with Thorium(Ⅳ)

HUANG Ya-Li, LIU Shao-Pu   

  1. Institute of Environmental Chemistry, Southwest China Normal University, Chongqing, 400715
  • Received:1998-06-17 Online:1999-03-24 Published:1999-03-24

PDF (PC)

被引次数

4

摘要： 合成了新显色剂对-二甲氨基偶氮氯膦,研究了它与Th(Ⅳ)的显色反应.结果表明:Th(Ⅳ)在0～30μg/25mL范围内与该试剂形成的配合物在674,612和538nm3个波长处吸光度绝对值之和与溶液中Th(Ⅳ)的浓度呈线性关系,故可利用该3个波长下吸光度绝对值叠加的方法测定Th(Ⅳ),其ε值达1.74×105L·mol-1·cm-1.由于显色反应在较强酸性介质中进行,本法有良好的选择性,大多数共存离子不干扰钍的测定,用于测定岩矿中的微量钍,结果满意.

关键词: 分光光度法, 钍, 对-二甲氨基偶氮氯膦

Abstract: The synthesis of the new reagent p-dimethylaminochlorophosphonazo(CPApDMA) and its colour reaction with thorium(Ⅳ) were studied. In HCl medium, the reagent reacted with thorium(Ⅳ) to form a blue complex with n[Th(Ⅳ)]:n[CPApDMA]=12 and an apparent molar absorptivity of 9.86×104L·mol-1·cm-1at 674 nm. The accumulating method of absorbances at multiwavelength for determining thorium(Ⅳ) was based on the sum of absorbances for the complex at 674, 612 and 538 nm, the apparent molar absorptivity in this case was 1.74×105L·mol-1·cm-1. Beers law is obeyed for thorium(Ⅳ) in the range of 0～30 g/25 mL. Most of the coexistent ions did not interfere with the determination of Th(Ⅳ). The method has been applied to the determination of trace amounts of thorium in rock standard samples with a high sensitivity and selectivity.

Key words: Spectrophotometry, Thorium, p-Dimethylaminochlorophonazo

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