Equilibrium experiments with SO 4 ‐Cl mixtures suggested that the quantity of anions held by a Cecil subsoil increases with time. Further experiments with K 2 SO 4 confirmed the “time” effect on two Cecil subsoils and on Fe‐treated Georgia kaolinite. On the basis of the time effect and other observations made on SO 4 2‐ adsorption a suggested mechanism is proposed. The mechanism envisions the replacement of OH ‐ ions by SO 4 2‐ and the hydrolysis of Al (in the presence of salt) to form H + ions. Thus, the OH ‐ ions are neutralized by H + ions and anion adsorption proceeds apace.
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Chang et al. (1963) studied this question.