Bulletin of the Chemical Society of Ethiopia (Dec 2005)
<b>Determination of mixed stability constants of lead(II)/uranyl(II)-NTA-cysteine complexes by paper electrophoresis</b>
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 plus or minus 0.02 and 6.27 plus or minus 0.07 (logarithm of stability constant values) at ionic strength 0.1 M and a temperature of 35 0C.
