Paper electrophoretic determination of the stability constants of binary and ternary complexes of copper(II) and cobalt(II) with nitrilotriacetate and cysteine

摘要

A paper ionophoretic method is described for the study of equilibria in mixed ligand (nitrilotri acetate-cysteine)complex system in solution. The proportion of ionic species of nitrilotriacetate (NTA) and cysteine were varied by changing the pH of background electrolyte. The stability constants of Cu(II)-NTA-cysteine and Co(II)-NTA-cysteine complexes were found to be 6.35 +/- 0.05 and 5.45 +/- 0.02 (logarithm stability constant values), respectively, at ionic strength 0.1 M and a temperature of 35 degrees C. (c) 2005 Elsevier B.V. All rights reserved.