SORPTION CHARACTERISTICS OF 137CS AND 90SR INTO REMBANG AND SUMEDANG SOILS
ABSTRACT: In order to
understand the sorption behavior of 137Cs and 90Sr into soil sample from
Rembang and Subang, it is important to estimate the effect of contact time,
ionic strength and concentration of metal ion in the solution. For this reason,
the interaction of 137Cs and 90Sr with soil sample has been examined. The study
performed at trace concentration (~10-8 M) of CsCl and SrCl2, and batch method
was used. NaCl has been selected as a representative of the ionic strength with
0.1; 0.5 and 1.0 M concentrations. Concentration of 10-8~10-4 M CsCl and SrCl2
were used for study the effect of Cs and Sr concentrations in solution. Apparent
distribution coefficient was used to predict the sorption behavior. The
sorption equilibrium of 137Cs and 90Sr into soil was attained after 5 days
contacted with Kd value around 3300-4200 mL/g, where Kd was defined as the
ratio of number of radionuclide activity absorbed in solid phase per-unit mass
to the number of radionuclide activity remains is solution per-unit volume.
Presence of NaCl as background salt in the solution affected Kd values due to
competition among metal ions into soil samples. Increase of Cs or Sr
concentration in solution made Kd value decreased drastically. This information
is expected could provide an important input for the planning and design of
radioactive waste disposal system in Java Island in the future.
Author: Budi Setiawan, Yusran
Dani, Nurmaya Arofah
Journal Code: jpkimiagg160099
