KINETIC-SPECTROPHOTOMETRIC DETERMINATION OF MOLYBDENUM(IV) BASED ON ITS CATALYTIC EFFECT ON THE THIONINE-HYDRAZINE REACTION

Citation
H. Parham et al., KINETIC-SPECTROPHOTOMETRIC DETERMINATION OF MOLYBDENUM(IV) BASED ON ITS CATALYTIC EFFECT ON THE THIONINE-HYDRAZINE REACTION, Analytical letters, 31(1), 1998, pp. 179-191
Citations number
11
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemistry Analytical
Journal title
ISSN journal
0003-2719
Volume
31
Issue
1
Year of publication
1998
Pages
179 - 191
Database
ISI
SICI code
0003-2719(1998)31:1<179:KDOMBO>2.0.ZU;2-T
Abstract
A kinetic method for the determination of trace amounts of Mo(VI) (0.0 5-4 mu g ml(-1)) based on its catalytic effect on the reduction of thi onine by hydrazine monochloride in strongly acidic media is reported. The reaction is monitored spectrophotometrically by measuring the decr ease in absorbance of thionine at 605 nn after a fixed time(5 min.). T he detection limit of the method is 23 ng ml(-1) and the relative stan dard deviation (RSD) for 0.05 mu g ml(-1) of Mo(VI) is 1.2% (n=7). The method is almost free from interferences, especially from large amoun ts of tungsten. The procedure was successfully applied to the determin ation of trace amounts of molybdenum in steel.