Abstract
PREVIOUS work indicated that the variation of the flocculation concentration of thorium with pH, such as occurs with silver iodide sols, can be attributed to variation of the extent of adsorption of thorium at the solid-liquid interface with PH.~ The latter effect appears to arise as a consequence of hydrolysis of the thorium ion in solution as the pH is increased. Some preliminary adsorption measurements using sol particles were not sufficiently precise for a detailed interpretation to be made.3 In the present work the adsorption of thorium in suspensions of silver iodide of known surface area has been examined in detail as a function of pH, ionic strength, and temperature. The results, combined with electrokinetic measurements , enable some conclusions to be reached about the change in nature of the adsorbing thorium species with increase of pH.
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