RecordNumber
180
Doc. No.
166A
Call. No.
166A
Author
Ensafi, A. A.,Safavi, A
Title of Article
Sensitive spectrophotometric kinetic determination of osmium by catalysis of the pyrogallol red-bromate reaction
Title Of Periodical
ANALYTICA CHIMICA ACTA
VolumNumber
No.244
Date
(1991)
Page
P.231-238
Descriptors
Spectrophotometry,Kinetic,Analysis,Osmiurm
Abstract
Osmium (VIII) is determined by mans 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 x 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 determination were studied. The effects of probable interfrences were competely removed by a single extraction of osmium as osmium tetraoxide into isoburyl methyl ketone and back-extraction into sodium hydroxide solution.
Indexer
1376/12
IndexDate
Shahsavary
اطلاعات ثبت
GN112201