Methylcysteine and Metal(II)
Nitrilotriacetate
Methylcysteine Complexes with Using a Paper Electrophoretic Method
B. B. Tewari
Department of Chemistry, Faculty of Natural Sciences, University of Guyana,
P.O. Box 101110, Georgetown, Guyana, S. America
E-mail: brijtew@yahoo.com
Received October 12, 2007
Abstract—A method involving the use of paper ionophoresis is described for the study of the equilibria in
mixed ligand complex systems in solution. Present method is based on the movement of a spot of metal ion
under the electric field with the complexants added in the background electrolyte at pH 8.5. The concentration
of primary ligand nitrilotriacetate (NTA) was kept constant while that of the secondary ligand methylcysteine
was varied. The plot of log [methylcysteine] versus mobility were used to obtain information on the formation
of mixed complexes and to calculate its stability constants. The binary equilibria metal(II)–methylcysteine and
metal(II)–NTA have also been studied, since this is a prerequisite for the investigation of mixed complexes. The
stability constants of the complexes Pb(II)–NTA–methylcysteine and UO2(II)–NTA–methylcysteine were
found to be 3.03 
0.05 and 3.42 0.09 (log K values) at ionic strength 0.01 M and a temperature of 35
C.
DOI: 10.1134/S0036023609010264
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