Chemical Speciation of Complexes of L-phenylalanine and maleic acid with toxic metal ions in Dimethylformamide -Water Mixtures
Keywords:
speciation, complex equilibria, Dimethyl formamide, L-phenylalanine, maleicacid, stability constants, HYSS HYPERQUAD, MINIQUAD75Abstract
The formation equilibria of complexes of Pb (II), Cd (II), and Hg (II) with L-phenylalanine and maleic acidwere investigated pH metrically in Dimethyl formamide-water mixtures (0-50%v/v) at 303 K and ionic strength of 0.16 moldm-3. The dominant species detected were ML2, ML2H, and ML3 of LPA and MA complexes of Pb(II), Cd(II) and Hg(II) were refined in DMF-water mixtures. The appropriateness of the experimental conditions was verified by introducing errors deliberately. The models containing different numbers of species were refined by using the computer program MINIQUAD75. Selection of the best fit models was based on the statistical parameters. The trend in variation of stability constant of the complexes with dielectric constant of the medium was attributed for the formation and possible structures of the complex species presented. The chemical speciation was explained based on the distribution diagrams drawn using HYSS HYPERQUAD.
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