Direct and derivative spectrophotometric determination of thorium with 2,4-dihydroxybenzaldehyde isonicotinoyl hydrazone

被引:14
作者
Sivaramaiah, S [1 ]
Reddy, PR [1 ]
Reddy, VK [1 ]
Reddy, TS [1 ]
机构
[1] Sri Krishnadevaraya Univ, Dept Chem, Anantapur 515003, Andhra Pradesh, India
关键词
D O I
10.1023/A:1006731026031
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A simple and sensitive spectrophotometric method is developed for the determination of thorium in aqueous medium. The metal ion forms yellow coloured complex with 2,4-dihydroxybenzaldehyde isonicotinoyl hydrazone (2,4-DHBINH) in the pH range 2.0-8.0. The complex shows an absorption maximum at 390 nm. The absorbance of the complex is maximum at pH 5.5. Beer's law is obeyed in the range 0.30-7.00 mu g/ml of thorium(IV). The molar absorptivity and the Sandell's sensitivity of the method are 2.20.10(4) l.mol(-1).cm(-1) and 0.0106 mu g/cm(2), respectively. The interference of various ions was studied. The composition of the complex is 1:1 {Th(IV) : 2,4-DHBINH}. The first derivative spectrum of the complex shows a zero cross at 391.2 nm and maximum amplitude at 415 nm. Thus a sensitive derivative spectrophotometric method for the determination of Th(IV) is proposed.
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页码:367 / 370
页数:4
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