Author :
Ensafi, ali A.,Sollari, shamss E
Title of Article :
Spectrophotometric reaction rate method for the determination of osmium by its catalytic effect on the oxidation of gallocyanine by bromate
Title Of Periodical :
TALANTA
VolumNumber :
V.41, No.10
Descriptors :
Osmium,Catalytic,Callocyanine,Spectrophotometry
Abstract :
A simple kinetic spectrophotometric method was developed for the determination of osmium. The method is baded 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 mg/ml OS(VIII) is 0.8,(N = 10). The method os free from most interfernces. Osmium in synthetic samples is determined by this method, with satisfactory results.
