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Micellar effect on metal-ligand complexes of Co(II), Ni(II), Cu(II) and Zn(II) with citric acid

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Author(s): Srinivasa Rao Pedada | Srikanth Bathula | Samba Siva Rao Vasa | Kamala Sastry Charla | Nageswara Rao Gollapalli

Journal: Bulletin of the Chemical Society of Ethiopia
ISSN 1011-3924

Volume: 23;
Issue: 3;
Start page: 347;
Date: 2009;
Original page

Keywords: Chemical speciation | Citric acid | Micelles | Metals | Binary complexes

ABSTRACT
Chemical speciation of citric acid complexes of Co(II), Ni(II), Cu(II) and Zn(II) was investigated pH-metrically in 0.0-2.5% anionic, cationic and neutral micellar media. The primary alkalimetric data were pruned with SCPHD program. The existence of different binary species was established from modeling studies using the computer program MINIQUAD75. Alkalimetric titrations were carried out in different relative concentrations (M:L:X = 1:2:5, 1:3:5, 1:5:3) of metal (M) to citric acid. The selection of best chemical models was based on statistical parameters and residual analysis. The species detected were MLH, ML2, ML2H and ML2H2. The trend in variation of stability constants with change in mole fraction of the medium is explained on the basis of electrostatic and non-electrostatic forces. Distributions of the species with pH at different compositions of micellar media are also presented.
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