Paper electrophoretic determination of the stability constants of binary and ternary complexes of copper(II) and cobalt(II) with nitrilotriacetate and cysteine.
A paper ionophoretic method is described for the study of equilibria in mixed ligand (nitrilotriacetate-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.
Tewari
Brij Bhushan
BB
Department of Chemistry, Faculty of Natural Science, University of Guyana, P.O. Box 101110, Georgetown, Guyana. brijtew@yahoo.com
D003035:Cobalt / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D003545:Cysteine / Q000737:chemistry*; D004590:Electrophoresis, Paper / Q000379:methods*; D009571:Nitrilotriacetic Acid / Q000737:chemistry*
D003035:Cobalt; D003300:Copper; D003545:Cysteine; D009571:Nitrilotriacetic Acid