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Electrochemical Studies of As (III) Complexes with Tyrosine in Aqueous and Aqueous-Nonaqueous Media (DMSO/DMF)

M. K. Paliwal and O. D. Gupta

The polarographic determination of stability constants of metal complexes of As (III) with tyrosine at 300 K in various aqueous and aqueous-nonaqueous media, have shown the formation of 1 : 1, 1 : 2 and 1 : 3 complexes. The values of overall stability constants of complexes have been calculated by DeFord and Hume's method, which is further verified by Mihoilov's method. The reduction process was found to be quasireversible and diffusion controlled involving three electrons transfer. It was found that the stability constants of As (III)-tyrosine system in aqueous-nonaqueous medium are less than in aqueous medium.