Abstract
The stability constants of zinc chloride, zinc, nitrate, zinc sulphate, zinc iodide and zinc hydroxide complexes have been determined by the pseudo-polarographic method at a zinc concentration level of 10 −8 mol/dm 3 in solutions of constant ionic strengths 4 mol/dm 3 and 0.5 mol/dm 3 (ZnOH x ). The zinc complexation constants obtained are compared with already published values determined at a zinc concentration a few orders of magnitude higher. Zinc forms five weak complexes with iodide ions. The distribution of Zn(II) ionic species in a buffered solution (pH 8.3) of chloride and sulphate ion was calculated by means of the experimentally obtained stability constants. The result indicated that the ZnOH + complex is the predominant ionic species in the solutions corresponding to natural estuarine and sea water.
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