Complex formation in the region of methal hydrolysis and M(OH)(2) precipitation. A glass electrode potentiometric and polarographic study of Cd-(AMPSO)(x)-(OH)(y) and Zn-(AMPSO)(x)-(OH)(y) systems

摘要

The interaction between cadmium or zinc and AMPSO was investigated by DCP and GER at fixed total ligand to total metal concentration ratios and various pH values, at 25.0 degrees C and 0.1 M KNO3 ionic strength. For Cd-(AMPSO)(x)-(OH)(y) system, CdL and CdL(OH) species, were identified, with stability constants values set to (as log beta): 2.1 +/- 0.1 and 6.2 +/- 0.2, respectively. For Zn-(AMPSO)(x)-(OH)(y) system, the proposed final model with stability constants set to (as log beta) is: ZnL = 2.5 +/- 0.1 and ZnL(OH)(2) = 12.9 +/- 0.2. For both systems, the fact that AMPSO deprotonation occurs in the metal hydrolysis and M(OH)(2) precipitation and the complexes formed are not too strong added a real challenge to data interpretation.