Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Some Reversible and Irreversible Electrode Processes at DME. A Study on Uranyl and Zinc Complexes of L-Hydroxyproline in Aqueous and Aqueous-Methanolic Solutions
P. C. RawatC. M. Gupta
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1973 Volume 46 Issue 10 Pages 3079-3081

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Abstract

Complexes of zinc and uranyl ions with L-hydroxyproline (LHP) have been investigated by polarographic method of analysis at 25±1 and 35±1 °C. At pH 4.5, formation of uranyl-LHP complex was observed with metal to ligand ratio of 1: 1 in aqueous and aqueous-methanolic solutions. The stability constant for the complex species is logKc=1.50, 1.30, 1.61, 1.87 in aqueous (25 °C), aqueous (35 °C), aqueous-methanolic (10% v/v) and aqueous-methanolic (50% v/v) media respectively. Between pH 3.0–12.0, zinc–LHP complex has been observed to be reduced irreversibly at DME. Detailed investigations have been reported on the system at 25±1 °C and 35±1 °C at pH 10.0 in varying concentrations of the ligand. Kinetic parameters—the formal rate constant Kf,h° and transfer coefficient α have been calculated.

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