Authors: AA Ensafi, AFSANEH Safavi

Publication date:1991/12/31

Journal name: Analytica chimica acta

Volume: 244

Pages: 231-236

Publisher: Elsevier

Abstract Osmium (VIII) is determined by means of its catalytic effect on the oxidation of
pyrogallol red (PGR) by potassium bromate at pH 6.0, 30 C and 545 nm. The decrease in
absorbance of PGR (2.5× 10− 5 M) in the presence of KBrO 3 (0.20 M) over a period of 0–
150 s is proportional to the concentration of osmium (VIII) over the range 0–1400 ng ml− 1.
The limit of detection of osmium was 0.65 ng ml− 1. The precision and accuracy of the
method are described. The effects of the presence of 45 cations and anions on osmium ...