Étude des complexes fluorés et chlorés du cadmium dans les mélanges eau–HF

Abstract

The formation of fluoride and chloride complexes in water – hydrogen fluoride mixtures has been studied using polarography. The reduction of the complexation by the fluoride ions from CdF3−down to CdF+ is in good agreement with the reduction of the fluoride ion activity, R0(F) with increasing HF concentration. At higher HF concentration than 60%, the half-wave potential for the reduction of cadmium is shifted in a pattern that cannot be explained by fluoride in complexation. The formation of CdCl3− and CdCl42− has been observed in H2O–HF–KCl mixtures when the HF concentration was increased to 60%.