EFFECT OF Ca IONS IN SOLUTION TO Cs-137 SORPTION INTO SOIL SAMPLES
摘要
EFFECT OF Ca IONS IN SOLUTION TO Cs-137 SORPTION INTO SOIL SAMPLES. Experiment of effect of Ca ions exist in solution to sorption of Cs-137 radionuclide into soil samples have been done. In environment, Ca ion is a major constituens of mineral exists in a solution, also this mineral can come from the weathering of waste matrix/packages, and soil as a host of the radwaste disposal facility has an important role to retard radionuclide migration such as Cs-137 from the facility into biosphere by sorption mechanism. The objective of work is to study the effect of Ca ion co-existing in a solution to Cs-137 sorption into soil samples. The experiments were evaluated by determine the sorption kinetic, sorption isotherm and effect of Ca ions to sorption of Cs-137 into soil. Batch method was performed for the laboratory work and Cs-137 radionuclide was used as a tracer. Concentrations of CsCl is 10-4 M and CaCl.2H2O as a Ca2+ simulated ions were ranged from 10-6 to 10-2 M. The results showed that saturation condition of Cs-137 into soil sample was reached after 2 days contact time, with Kd was 4500 ml/g. Sorption isotherm of Cs-137 into soil followed Freundlich law, and the existence of Ca ions in a solution was not give an effect to the sorption of Cs-137 into soil samples.