SPECTROPHOTOMETRIC REACTION-RATE METHOD FOR THE DETERMINATION OF MOLYBDENUM BY ITS CATALYTIC EFFECT ON THE OXIDATION OF PYROGALLOL RED WITHHYDROGEN-PEROXIDE

Authors
ENSAFI AA HAGHIGHI A
Citation
Aa. Ensafi et A. Haghighi, SPECTROPHOTOMETRIC REACTION-RATE METHOD FOR THE DETERMINATION OF MOLYBDENUM BY ITS CATALYTIC EFFECT ON THE OXIDATION OF PYROGALLOL RED WITHHYDROGEN-PEROXIDE, Fresenius' journal of analytical chemistry, 360(5), 1998, pp. 535-538
Citations number
16
Categorie Soggetti
Chemistry Analytical
Journal title
Fresenius' journal of analytical chemistry → ACNP
ISSN journal
09370633
Volume
360
Issue
5
Year of publication
1998
Pages
535 - 538
Database
ISI
SICI code
0937-0633(1998)360:5<535:SRMFTD>2.0.ZU;2-9
Abstract
A kinetic spectrophotometric method for the determination of molybdenu m is based on its catalytic effect on the oxidation of pyrogallol red with hydrogen peroxide. The decrease of the absorbance of pyrogallol r ed in the presence of hydrogen peroxide with time from 0.5 to 4.5 min is proportional to the concentration of Mo(VI) over the range 0.010-0. 500 mu g/mL. The limit of detection is 0.008 mu g Mo/mL. The precision and the effect of the presence of more than forty ions on the molybde num determination are reported. Probable interferences are completely removed by a cation exchange resin. The procedure was successfully app lied to the determination of molybdenum in plant materials and steels.