Investigation of cesium adsorption on soil and sediment samples from Fukushima Prefecture by sequential extraction and EXAFS technique
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چکیده
Copyright © 2012 by The Geochemical Society of Japan. et al . , 2005). The structure of Cs adsorption on montmorillonite and vermiculite was examined with extended X-ray adsorption fine structure spectroscopy (EXAFS), and outer-sphere (OS) and inner-sphere (IS) complexes were determined by Bostick et al. (2002). Their study also suggested that EXAFS is a very useful technique to investigate the type of Cs binding in environmental samples and to predict the migration behaviors of Cs. The Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, which was caused by the catastrophic earthquake and tsunami that occurred on 11 March 2011, led to great emissions of radioactive 137Cs and serious soil contaminations around FDNPP and neighboring prefectures (Kinoshita et al., 2011; Yasunari et al., 2011; Yoshida and Takahashi, 2012). Investigations on vertical profiles showed that radiocesium was mainly retained at the very surface of soils in Fukushima Prefecture, and clay minerals and micas were speculated to be responsible for the high affinity of Cs in soils (Cha et al., 2006; Kato et al., 2012; Ohno et al., 2012; Tanaka et al., 2012; Watanabe et al., 2012). However, no direct evidence exists on the host phase of Cs in such soils to support this hypothesis. Investigation of cesium adsorption on soil and sediment samples from Fukushima Prefecture by sequential extraction and EXAFS technique
منابع مشابه
Vertical profiles of Iodine-131 and Cesium-137 in soils in Fukushima Prefecture related to the Fukushima Daiichi Nuclear Power Station Accident
Soil core samples were taken on April 13, 2011 at three sites in Fukushima prefecture: Hiwada in Koriyama-city (Site 1; N 37°28′32′′, E 140°23′17′′; two cores were obtained in Site 1), Yabuki in Nishi-Shirakawa-county (Site 2; N 37°11′59′′, E 140°20′37′′), and Iizaka in Fukushimacity (Site 3; N 37°48′50′′, E 140°26′34′′). The distances of the three sites from the Fukushima Daiichi Nuclear Power...
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Cesium adsorption on the clay minerals vermiculite and montmorillonite is described as a function of surface coverage using extended X-ray adsorption fine structure spectroscopy (EXAFS). Cesium (Cs) possessed a variable coordination environment consisting of Cs-O distances between 3.2 and 4.3 A; however, disorder typical of the Cs coordination environments prevented the resolution of all oxygen...
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