Complexation equilibria and spectrophotometric determination of thorium(IV) with lawsone

被引：0

作者：

Al-Nady, ABM ^{[1
]}

Al-Shaibi, Y

Ba-Issa, A

Ariqui, W

机构：

[1] Assiut Univ, Fac Sci, Dept Chem, Assiut 71516, Egypt

[2] Sanaa Univ, Fac Sci, Dept Chem, Sanaa, Yemen

来源：

ANNALI DI CHIMICA | 2001年 / 91卷 / 9-10期

关键词：

D O I：

暂无

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The complex equilibria of Tb4+, with Lawsone (2-hydroxy-1,4-naphthoquinone, LAS) were studied spectrophotometrically in 40% (v/v) ethanol water at 25 degreesC and an ionic strength of 0.1 M (NaClO4). The absorbance graphs were analysed to demonstrate and characterize the complex forming equilibria. A simple, rapid, selective and sensitive method for the spectrophotometric determination of trace amounts of thorium(IV) is developed. The complex formed at pH 2.1-3.6 (epsilon 0.27x10(4) cm(2) mol(-1), at lambda = 440 nm) allows the determination of 5.8-32 mug/ml thorium. The effect of interferences was studied.

引用

页码：659 / 665

页数：7

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