The effect of ionic strength on copper(II) complexing ability of humic acid (HA) was investigated. The conditional stability constants and the copper(II) complexing capacities were evaluated at the ionic strength of 0.005 - 0.1. The copper(II) complexing capacities of HA increased with ionic strength. By extrapolating the conditional stability constants to ionic strength 0, the thermodynamic stability constant was evaluated. The free ligand concentration in the solution containing copper(II) and humic acid was calculated by using the thermodynamic stability constant obtained. The free ligand concentration also increased with ionic strength. The increase of copper(II) complexing ability of HA with ionic strength was discussed from the viewpoints of the dissociation of the acidic functional groups in HA and the conformational change of HA.
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Fukushima et al. (1994) studied this question.
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