A new method for determination of trace amount thorium—spectrophotometric determination of thorium in aqueous phase by chlorophosphonazo-mA

Yuanxian Xia; Hesheng Qian

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A new method for determination of trace amount thorium—spectrophotometric determination of thorium in aqueous phase by chlorophosphonazo-mA

更新时间：2022-08-16

- A new method for determination of trace amount thorium—spectrophotometric determination of thorium in aqueous phase by chlorophosphonazo-mA
- Nuclear Techniques Vol. 09, Issue 1, (1986)
- 作者机构：
  
  中国科学院上海原子核研究所
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：08 January 1985，
  
  Published：1986-01
- 稿件说明：
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Yuanxian Xia, Hesheng Qian. A new method for determination of trace amount thorium—spectrophotometric determination of thorium in aqueous phase by chlorophosphonazo-mA[J]. Nuclear techniques, 1986, 09(1): 53-54,64,13.
DOI：

Yuanxian Xia, Hesheng Qian. A new method for determination of trace amount thorium—spectrophotometric determination of thorium in aqueous phase by chlorophosphonazo-mA[J]. Nuclear techniques, 1986, 09(1): 53-54,64,13. DOI：

摘要

目前，用于分光光度法测定微量钍的显色剂不少，常用的有钍试剂、偶氮胂I、偶氮胂羧、偶氮胂Ⅲ和偶氮氯膦Ⅲ。其中偶氮胂Ⅲ为最常用的显色剂，该显色剂只有在中等酸度下测钍才具有较高的灵敏度。其它显色剂在低酸介质中测钍时灵敏度并不理想。偶氮氯膦－mA是由上海师大于1979年首先合成并应用于稀土元素分析的新型显色剂，它为深紫红色结晶粉末，易溶于水，在酸性介质中与钍形成蓝紫色络合物，其结构式如下：

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Abstract

In this paper the spectrophotometric method for determination of trace amount of thorium in weak acidic medium by chlorophosphonazo-mА is described. The composition of the complex was estimated to be 1:4 by slope ratio method. The apparent molar absorption of thorium at 675 nm is 9.2×10

. Beer's law is obeyed for 0—12.0µg of thorium in 10ml solution. The coefficient of variation for thorium is 0.88%. The method has been applied to the determination of trace amounts of thorium in the extraction process of thorium.

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references

上海师大有机合成研究室等，理化检验， 6 , 1 ( 1979 ).

H. Chung-Gin et al . , Anal. Chim. Acta. , 124 , 177 ( 1981 ).

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