Speciation Studies of L-Methionine complexes of Pb(II), Cd(II) and Hg(II) in acetonitrile-water mixtures

K. Bhaskara Rao; N.V.V. Simhadri; N. Vijaya Kumar; T. Siva Rao; G. Nageswara Rao

Speciation Studies of L-Methionine complexes of Pb(II), Cd(II) and Hg(II) in acetonitrile-water mixtures

Authors

K. Bhaskara Rao School of Chemistry, Andhra University,Visakhapatnam-530003, India
N.V.V. Simhadri School of Chemistry, Andhra University,Visakhapatnam-530003, India
N. Vijaya Kumar School of Chemistry, Andhra University,Visakhapatnam-530003, India
T. Siva Rao School of Chemistry, Andhra University,Visakhapatnam-530003, India
G. Nageswara Rao School of Chemistry, Andhra University,Visakhapatnam-530003, India

Keywords:

Complex equilibria, Chemical speciation, L-Methionine, Acetonitrile, Metals

Abstract

Equilibrium study on complex formation of L-methionine 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 MLH,ML and ML2.. 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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Published

2014-11-06

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How to Cite

K. Bhaskara Rao, N.V.V. Simhadri, N. Vijaya Kumar, T. Siva Rao, and G. Nageswara Rao. “Speciation Studies of L-Methionine Complexes of Pb(II), Cd(II) and Hg(II) in Acetonitrile-Water Mixtures”. International Journal of Pharmaceutics and Drug Analysis, vol. 2, no. 11, Nov. 2014, pp. 822-9, https://ijpda.org/index.php/journal/article/view/119.