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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

Investigation of cesium adsorption on soil and sediment samples from Fukushima Prefecture by sequential extraction and EXAFS technique

HAIBO QIN, YUKA YOKOYAMA, QIAOHUI FAN, HOKUTO IWATANI, KAZUYA TANAKA, AYA SAKAGUCHI, YUTAKA KANAI, JIANMING ZHU, YUICHI ONDA, YOSHIO TAKAHASHI
Geochemical Journal, Vol. 46, No. , P. 297-302, 2012

ABSTRACT

Previous studies have shown that radiocesium (mainly 137Cs) was retained at the very surface of soils in Fukushima Prefecture. Clay minerals and micas are assumed as the main sorbents for cesium (Cs) in Fukushima, but direct evidence is lacking for this hypothesis. In this study, radiocesium in the natural sample (soil and sediment) from Fukushima Prefecture was investigated through sequential extraction experiment (modified BCR method), which showed that more than 94% of 137Cs was fixed in the residual phase. The results indicated that most of Cs occurred in the interlayer of phyllosilicate minerals. Furthermore, Cs LIII-edge extended X-ray absorption fine structure (EXAFS) showed that the Cs species adsorbed on the natural samples were very similar to those adsorbed on clay minerals and micas. This finding provided the direct evidence on the significant contribution of clay minerals or micas to Cs retention in soils from Fukushima Prefecture.

KEYWORDS

cesium, adsorption, clay minerals, sequential extraction, extended X-ray absorption fine structure (EXAFS), Fukushima

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