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The profound influence of the hydrolytic behaviour of ions of heavy metals such as Cu, Zn, Pb, Cd, Mn and Ni on the electrophoretic mobility of colloidal clay taken from slurries from ponds from former tin mines was studied. The strong adsorption of soluble hydrolysed species and insoluble metallic hydroxide on the clay surface leads to a reduction in the surface charge of the clay particles and...