Adsorption Behavior of ⁶⁰Co on Sandy Soil

Abstract

The adsorption behavior of⁶⁰Coon sand has been studied under various conditions. The amount of adsorption obeyed the Henry adsorption isotherm in concentration range of 10^-14-10^-10mmol/ml and the Freundlich adsorption isotherm in concentration range of 10^-9-10^-2mmol/ml. The distribution coefficient became to a maximum value under neutral region, but fell to a value less than 1- 2 order under acidic and alkaline region. The distribution coefficient measured under aerobic condition was larger than that under anaerobic condition in acidic region, but was smaller than that under anaerobic condition in alkaline region. The distribution coefficient measured at temperature of 10-50 °C was proportional to reciprocal temperature. Influence of co-existent ion was not observed in co-existent ion concentration less than 10^-4mmol/ml, but was confirmed in coexistent ion concentration more than 10^-3mmol/ ml.