Abstract
A new method, involving the use of paper electrophoresis, is described for the study of the equilibria in mixed-ligand complex systems in solution. The method is based on the migration of a spot of a metal ion, with the complexants added in the background electrolyte (0.1 M perchloric acid), at a fixed pH. The concentration of one of the complexants (A) is kept constant, while that of the second ligand (L) is varied. A graph of −log [L] against mobility is used to obtain information on the formation of the mixed-ligand complex, and to calculate the stability constant. Using this technique, the values of the overall stability constants β MAL of the complex metal(II)-oxalate-nitrilotriacetate, [MAL] 3−, have been found to be 10 9.8 and 10 8.9 for copper(II) and nickel(II) complexes, respectively.
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