Sorption behavior of Cs in a river-sea system boundary

高田 兵衛*; 脇山 義史*; 和田 敏裕*; 平尾 茂一*; 青野 辰雄*; 中西 貴宏   ; 御園生 敏治   ; 尻引 武彦*; 青山 道夫*

Takata, Hyoe*; Wakiyama, Yoshifumi*; Wada, Toshihiro*; Hirao, Shigekazu*; Aono, Tatsuo*; Nakanishi, Takahiro; Misono, Toshiharu; Shiribiki, Takehiko*; Aoyama, Michio*

The aim of this study was to measure the sorption behavior of Cs in suspended particles in Tomioka River and its coastal seawater near the Fukushima Daiichi Nuclear Power Plant and then, by comparing the sorbed fractions between river water and seawater. Proportions of ion-exchangeable, organically bound, and refractory fractions of Cs on suspended particles were determined by sequential extraction. The ion-exchangeable fraction accounted for less than 2% at those two sites. The organically bound fraction accounted for only a few %, suggesting that in both areas, the refractory fraction accounted for 90% of Cs.