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Article – Journal of Advanced Electrochemistry

Journal of Advanced Electrochemistry, Volume 1,Issue 1,2015 Pages 5-8

Chemical Speciation of Divalent Metal complexes of L-Aspartic Acid in Propylene Glycol-Water Mixtures
C.L. Athota, R.K. Valluri, N.R. Gollapalli*

Chemical speciation of some essential metal complexes of L-aspartic acid in 0.0-60.0% v/v propylene glycol-water mixtures has been studied pH metrically at an ionic strength of 0.16 mol L-1 and 303 K. The active forms of the ligand are LH3+, LH2, LH- and L2-. The predominant species detected are ML, ML2H2, ML2H3, and ML2H4. Models containing different numbers of species were refined by using the computer program MINIQUAD75. 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.
Keywords: Complex EQUILIBRIA; Chemical Speciation; L-Aspartic Acid; Propylene Glycol;