Spectrophotometric determination of trace thorium with DBN-arsenazo

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Spectrophotometric determination of trace thorium with DBN-arsenazo

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- Spectrophotometric determination of trace thorium with DBN-arsenazo
- NUCLEAR TECHNIQUES Issue 3, (1994)
- 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： TL271.4
- Published：01 March 1994
- 稿件说明：
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[1]尹端沚,郑建,曹本红.DBN－偶氮胂在微量钍的分光光度测定中的应用[J].核技术,1994(03):168-171.

Spectrophotometric determination of trace thorium with DBN-arsenazo[J]. Nuclear techniques, 1994, (3).
[1]尹端沚,郑建,曹本红.DBN－偶氮胂在微量钍的分光光度测定中的应用[J].核技术,1994(03):168-171. DOI：

Spectrophotometric determination of trace thorium with DBN-arsenazo[J]. Nuclear techniques, 1994, (3). DOI：

摘要

以ＤＢＮ－偶氮胂作为微量钍的分光光度测定的显色剂。结果表明，在１ｍｏｌ／ＬＨＣｌ溶液中，ＤＢＮ－偶氮胂和钍的络合物在λ＝６３０ｎｍ处的表观摩尔吸光系数为８．６×１０４Ｌ·ｍｏｌ－１·ｃｍ－１，并且可在高达９０倍的铀存在下测定微克级的钍。在０—１３μｇＴｈ／１０ｍｌ范围内符合比耳定律，标准曲线线性良好，相关系数ｒ＝０．９９９１。在３０％ＴＢＰ－煤油溶液中采用互溶法，可用ＤＢＮ－偶氮胂直接测定微量钍。采用乙二醇丁醚为互溶剂，显色剂和钍的络合物稳定性仍能满足要求，比耳定律适用范围不变，标准曲线线性良好。

Abstract

The application of DBN-arsenazo in determination of trace thorium was described. In aqueous solution

the thorium DBN-arsenazo complex exhibited maximum absorbance at 630nm. Molar absorptivity in 1 mol/L HCl was calculated（εmax=8.6×104L·mol-1 cm-1）.The uranium interference can be tole rated even if its intensity is 90 tabes higher than thorium itself. Beer’s law is obeyed in the concentration range of 0-13μg Th/10ml with correlation coefficient r=0.9991. In 30% TBP-kerosene solution

trace thorium can be directly determined by DBN-arsenazo using ethylene glycol monobutyl ether as intersolvent.The thorium DBN- arsenazo complex exhibited maximum absorbance at 620nm in the intersoluble system.Molar absorptivity was calculated（εmax = 4.9×104L·mol-1·cm-1）. Beer’s law is obeyed in the concentration range of 0- 14μg Th/10ml.

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