Influence of dielectric constant  on the speciation of Pb(II), Cd(II) and Hg(II) with L-valine in 1, 2- Propanediol-water mixtures.

Dr. P. Bhushanavathi; Dr. P. Sarada.

Volume : IV, Issue : XI, November - 2015

Influence of dielectric constant on the speciation of Pb(II), Cd(II) and Hg(II) with L-valine in 1, 2- Propanediol-water mixtures.

Dr. P. Bhushanavathi, Dr. P. Sarada.

Abstract :

Potentiometric technique with glass electrode as a probe was employed for data acquisition under carefully designed experimental conditions. The Calvin-Wilson titration technique as modified by Irving and Rossetti will be used for the primary data acquisition. The stability constants of Pb(II), Cd(II) and Hg(II) with L-valine in 1, 2- Propanediol-water mixtures were refined using computer program MINIQUAD75. The stability constants increased linearly with decreasing dielectric constant of the medium due to dominance of electrostatic forces and structure forming nature of 1, 2- Propanediol. The plausible structures of the species were also presented.