Abstract
Copper complexing ability of strong ligands isolated from seawater is investigated by means of thermodynamic calculations using the experimental results of two different measurements. Model parameters are derived from published data for copper complexation of natural ligands in seawater. Analyses by the model in the present study indicated that the strong ligand has been maintained quantitatively in the form of the complex with copper during the course of both experiments and that its copper complex is remarkably stable. The tentative calculation based on the results of both experiments suggests that the values for conditional stability constants are in the ranges of 1014.9-1016.4 at an ionic strength lower than 10-5M, pH5.71, and a temperature of 4°C.
