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Determination of stability constants of metal(II)-methylcysteine and metal(II)-nitrilotriacetate-methylcysteine complexes with using a paper electrophoretic method

  • Physical Chemistry of Solutions
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Abstract

A method involving the use of paper ionophoresis is described for the study of the equilibria in mixed ligand complex systems in solution. Present method is based on the movement of a spot of metal ion under the electric field with the complexants added in the background electrolyte at pH 8.5. The concentration of primary ligand nitrilotriacetate (NTA) was kept constant while that of the secondary ligand methylcysteine was varied. The plot of log [methylcysteine] versus mobility were used to obtain information on the formation of mixed complexes and to calculate its stability constants. The binary equilibria metal(II)-methylcysteine and metal(II)-NTA have also been studied, since this is a prerequisite for the investigation of mixed complexes. The stability constants of the complexes Pb(II)-NTA-methylcysteine and UO2 (II)-NTA-methylcysteine were found to be 3.03 ± 0.05 and 3.42 ± 0.09 (log K values) at ionic strength 0.01 M and a temperature of 35°C.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Natural Sciences, University of Guyana, P.O. Box 101110, Georgetown, Guyana, S. America

    B. B. Tewari

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  1. B. B. Tewari
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Correspondence to B. B. Tewari.

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Original Russian Text © B.B. Tewari, 2009, published in Zhurnal Neorganicheskoi Khimii, 2009, Vol. 54, No. 1, pp. 151–155.

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Tewari, B.B. Determination of stability constants of metal(II)-methylcysteine and metal(II)-nitrilotriacetate-methylcysteine complexes with using a paper electrophoretic method. Russ. J. Inorg. Chem. 54, 151–155 (2009). https://doi.org/10.1134/S0036023609010264

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  • DOI: https://doi.org/10.1134/S0036023609010264

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