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Bulletin of the Chemical Society of Ethiopia

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DETERMINATION OF MIXED STABILITY CONSTANTS OF LEAD(II)/URANYL(II)-NTA-CYSTEINE COMPLEXES BY PAPER ELECTROPHORESIS

Brij Bhushan Tewari

Abstract


A method involving the use of paper ionophoresis is described for the study of equilibria in mixed – ligand complex systems in solution. The technique is based on the movement of a spot of metal ion under an electric field with the complexants added to the background electrolyte at pH 8.5. The stability constants of the complexes Pb(II) – nitrilotriacetate – cysteine and UO2(II) – nitrilotriacetate – cysteine are found to be 5.35 ± 0.02 and 6.27 ± 0.07 (logarithm of stability constant values) at ionic strength 0.1 M and a temperature of 35 0C.

KEY WORDS: Paper ionophoresis, Lead(II) complexes, Uranyl(II) complexes, Nitrilotriacetic acid, Cysteine, Stability constants.


Bull. Chem. Soc. Ethiop. 2005, 19(2), 257-265.



http://dx.doi.org/10.4314/bcse.v19i2.21131
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