Park, Sang-Min Yang, Jung-Seok Tsang, Daniel C. W. Alessi, Daniel S. Baek, Kitae 2024-01-19T21:01:42Z 2024-01-19T21:01:42Z 2021-08-31 2019-02 0269-4042 https://pubs.kist.re.kr/handle/201004/120441 The retention of radioactive cesium (Cs) in soil is significantly related to the types of clay minerals, while the weathering process affects the irreversible adsorption sites in clay minerals. In this study, the effect of weathering (exposure duration of Cs and repeated wetting and drying cycles) on fractionation of Cs in soils was investigated using fractionation analysis by the sequential extraction. The residual fraction of Cs increased slowly with exposure time but increased rapidly by repeated wetting and drying cycles. XRD analysis shows that a 1.43nm of interlayer size for vermiculite is shortened to 1.00nm, i.e., similar to that of illite. The change implies the potential that the structure of expandable clay minerals is transformed to the non-expandable structure by weathering process after Cs retention. Based on the result, the residual fraction of Cs, most stable form of Cs in the soil, reached relatively rapidly to a maximum. However, the process is much slower kinetically in the field because the bench-scale weathering process used in this study is more aggressive. This study implies that Cs fractionations in the soil are converted into a more stable fraction by weathering processes in the soil. Therefore, Cs removal should be conducted as soon as possible after accidental release of Cs in an environmental side. English SPRINGER SORPTION BEHAVIOR ORGANIC-MATTER CLAY-MINERALS DESORPTION ADSORPTION CS-137 CS CONTAMINATION VERMICULITE PHYTOREMEDIATION Enhanced irreversible fixation of cesium by wetting and drying cycles in soil Article 10.1007/s10653-018-0174-0 1 ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, v.41, no.1, pp.149 - 157 ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 41 1 149 157 scie scopus 000461033700012 2-s2.0-85052298408 Engineering, Environmental Environmental Sciences Public, Environmental & Occupational Health Water Resources Engineering Environmental Sciences & Ecology Public, Environmental & Occupational Health Water Resources Article; Proceedings Paper SORPTION BEHAVIOR ORGANIC-MATTER CLAY-MINERALS DESORPTION ADSORPTION CS-137 CS CONTAMINATION VERMICULITE PHYTOREMEDIATION Cesium fractionation Wetting and drying cycles Weathering Clay minerals Soil contamination