Adsorption and retardation of Sr2+ by four clays were investigated, which were evaluated by using the distribution coefficient (KD) and average penetration length ratio of Sr2+ to water (r). KD values for Sr2+ among the four clay minerals were in the order: kaolinite < illite < vermiculite ≪ allophane, and Sr2+ penetration length ratio (r) followed the inverse order. Adsorption was further analyzed by using Langmuir adsorption model for competitive Sr2+ and Na+ adsorption at constant NaCl concentration. Conditional affinity constants suggested that Sr2+ adsorption on the variable charge sites of clay edges contributed to the high conditional Sr2+ affinities.
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