SPECTROPHOTOMETRIC REACTION-RATE METHOD FOR THE DETERMINATION OF OSMIUM BY ITS CATALYTIC EFFECT ON THE OXIDATION OF GALLOCYANINE BY BROMATE

被引:17
作者
ENSAFI, AA
SOLLARI, ESE
机构
[1] College of Chemistry, Isfahan University of Technology, Isfahan
关键词
D O I
10.1016/0039-9140(94)E0095-9
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A simple kinetic spectrophotometric method was developed for the determination of osmium. The method is based on the catalytic effect of osmium as osmium tetroxide on the oxidation of gallocyanine by bromate at pH 7. The reaction is monitored spectrophotometrically by measuring the decreasing absorbance of gallocyanine at 620 nm by the fixed-time method. A detection limit of 0.01 ng/ml and linear calibration curve from 0.1 to 100 and from 100 to 1200 ng/ml Os(VIII) is reported. The relative standard deviation for 0.0100 mu g/ml Os(VIII) is 0.8% (N = 10). The method is free from most interferences. Osmium in synthetic samples is determined by this method, with satisfactory results.
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页码:1651 / 1655
页数:5
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