Abstract
It is well known that the maximum extraction of metal by carboxylic acids is obtained at pH values just below the hydroxide precipitation.
However, pH values of metal extraction in the presence of sulphate and chloride ions differ from the values described above.
In this paper, the distribution of the metal ion was studied at a constant total ionic strength using sulphate or chloride as the supporting electrolyte anion.
The ion association constants for the association between the ligand and the metal ion were computed from those experimental data.
