Authors: Ali A Ensafi, B Rezaei

Publication date: 1993/8/1

Journal name: Analytical letters

Volume: 26

Pages: 1771-1785

Publisher: Taylor & Francis Group

Abstract A Kinetic-spectrophotometric method for the determination of ultra-trace amounts of
osmium (VIII) is described. It is based on the catalytic action of osmium (VIII) on the oxidation
of pyrogallol red with hydrogen peroxide, yielding a colorless product in neutral medium.
The reaction is followed spectrophotometrically by measuring the rate of change in
absorbance at 540 nm and 30° C. Os (VIII) in the range 0.005-100 ng. ml− 1 can be
determined. The proposed method is hardly subject to interferences. The relative standard ...