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Title: Osmium(VIII) catalysed oxidation of antimony(lll) by alkaline Hexacyanoferrate(lll) and analysis of osmium{VIII) in microamount by a kinetic method
Authors: Timmanagoudar, P L
Hiremath, G A
Nandibewoor, S T
Issue Date: Dec-1996
Publisher: NISCAIR-CSIR, India
Abstract: The osmium(VIll) catalysed hexacyanoferrate(lll) oxidation of antimony(lll) in aqueous alkaline medium at 25°C obeys the rate law

where K2 is the equilibrium constant for the reaction

K3 is the formation constant for the complex formation between alkaline species of osmium(Vlll) and hexacyanoferrate(lll) and k is the rate constant of the slow step. The data suggest that the reaction goes through catalyst-oxidant complex formation followed by the reaction of substrate with complex in the rate determining step. The reaction constants involved in the mechanism are derived. The title reaction has been utilised for the analysis of osmium(Vlll) in the range 0.019 µg cm-3 to 0.66 µg cm-3.
Page(s): 1084-1090
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.35A(12) [December 1996]

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