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Chemical speciation of Pb(II), Cd(II), Hg(II), Co(II), Ni(II), Cu(II) and Zn(II) complexes of L - methionine in 0.0-60 % v/v 1,2-propanediol-water mixtures maintaining an ionic strength of 0.16 M at 303 K has been studied pH metrically. The active forms of ligand are LH 2 + , LH and L - . The predominant species detected are ML, MLH, ML 2 , ML 2 H, ML 2 H 2 and MLOH. Models containing different numbers of species were refined by using the computer program MINIQUAD 75. The best-fit chemical models were arrived at based on statistical parameters. The trend in variation of complex stability constants with change in the dielectric constant of the medium is explained on the basis of electrostatic and non-electrostatic forces. KEY WORDS : Complex equilibria, Chemical speciation, L-Methionine, 1,2-Propanediol, Metals Bull. Chem. Soc. Ethiop. 2007 , 21(3), 363-372.

bulletin of the chemical society of ethiopia

&lt;b&gt;CHEMICAL SPECIATION OF Pb(II), Cd(II), Hg(II), Co(II), Ni(II), Cu(II) AND Zn(II) BINARY COMPLEXES OF L-METHIONINE IN 1,2-PROPANEDIOL–WATER MIXTURES&lt;/b&gt;