【摘要】 本文对２０种不对称变色酸双偶氮胂酸型显色剂与钍的分析特性进行了探讨。着重研究了４－ＣＡｓＡ－ＤＢＳＮ与钍显色反应的光度性质，在１２ｍｏｌ／ＬＨＣＩＯ４介质中与钍形成稳定的蓝色配合物，在６４２ｎｍ最大吸收处，摩尔吸光系数为１．２×１０５１ｍｏｌ－１ｃｍ－１，比耳定律范围为０－３５μｇ／２５ｍｌ。铀、钛、稀土和常见金属离子不干扰测定，这方法应用于钨钍合金中钍的测定结果满意。更多还原

【Abstract】 This paper rePOrts the properties of 20 asymmetric bisazo chromotropic acid reagents of arsenic acid type with Th. The properties and colour reaction of 4-CAsA-DBSN with Th have been studied in detail. In 12mol / L HCIO4 medium, Th forms with reagent a blue stable complex with a maximum absorption at 642nm, its molar absorptivity being 1.2×105. Beer’s law is obeyed for 0-35μg of Th in 25ml of solution. Uranium (Ⅵ), Ti(Ⅳ), rare earths and most of other common metal ions do not interfere. This method has been applied to the determination of Th in W-Th alloys with satisfactory results.更多还原