Sorption Characteristics of  137 Cs and  90 Sr into Rembang and Sumedang Soils

Budi Setiawan; Yusran Dani; Nurmaya Arofah

doi:10.22146/ijc.21142

Sorption Characteristics of ¹³⁷Cs and ⁹⁰Sr into Rembang and Sumedang Soils

https://doi.org/10.22146/ijc.21142

Budi Setiawan^(1*), Yusran Dani⁽²⁾, Nurmaya Arofah⁽³⁾

(1) Center for Radioactive Waste Technology - National Nuclear Energy Agency, Kawasan PUSPIPTEK Bld 71, 3rd Floor, Serpong-Tangerang 15310
(2) Department of Chemistry, Faculty of Science and Technology, State Islamic University Syarif Hidayatullah, Jl. Ir. Haji Juanda No. 95, Ciputat, Tangerang Selatan, Banten 15412
(3) Department of Chemistry, Faculty of Science and Technology, State Islamic University Syarif Hidayatullah, Jl. Ir. Haji Juanda No. 95, Ciputat, Tangerang Selatan, Banten 15412
(*) Corresponding Author

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.

Keywords

radioactive waste; host rock; cesium; strontium; sorption

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DOI: https://doi.org/10.22146/ijc.21142