微量のセシウムを取り込んだスメクタイトからの主要陽イオンによるセシウム溶出挙動

概要

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The desorption behaviors of Cs from Cs bearing smectite by major cations (Na^+, K^+, Mg^<2+>, Ca^<2+> and NH_4^+) were systematically examined. The suspension of the Cs bearing smectite was prepared by reaction of 1g/L smectite with 75 nM Cs^+ solution in 0.02 M NaCl solutions. The desorption behaviors of Cs were examined by adding the major cations of which concentrations ranged from 10^<-3> to 10^<-1>N to the smectite suspensions. All cations except for K^+ lead to the desorption of Cs from smectite when the concentrations of the added cations increased. On the other hand, K^+ plays a role for inhibition of Cs desorption from smectite. The order of the ability for the desorption of Cs from smectite by the major cations was summarized as follow: Ca^<2+> ≒ Mg^<2+> > NH_4^+ > Na^+ > K^+. The selectivity coefficients based on Gaines-Thomas convention were estimated from the observed desorption behaviors.
2013-03-28