Speciation study of Mercaptosuccinic acid complexes of Pb(II), Cd(II) and Hg(II) in Acetonitrile-water mixtures
Keywords:
Complex equilibria, Chemical speciation, Mercaptosuccinic acid, Acetonitrile, MetalsAbstract
Equilibrium study on complex formation of Mercaptosuccinic acid with Pb(II), Cd(II) and Hg(II) has been investigated pH metrically in acetonitrile - water mixtures 0.0-60% v/v at 303 K and 0.16 M ionic strength. The predominant species detected for Pb(II), Cd(II) and Hg(II) are MLH2. 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.
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