ベントナイトにおける2価鉄,マンガンイオンの関与するイオン交換平衡の選択係数

概要

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The Gains-Thomas ion exchange selectivity coefficients, KGT of Fe^<2+> and Mn^<2+> on Ca -saturated bentonite (Kunigel V-1) were determined in an oxygen free condition in order to grasp the behaviors of these ions in anaerobic environments. This bentonite sample contained 48 %(W/W) of montmorillonite. Maximum adsorbed Ca was 0.31 mmol g^<-1> of bentonite. The average ion exchange selectivity coefficients: K_<GT> of Fe^<+> to Ca -bentonite was 1.09, with a variation of 0.64 - 1.40, regardless of the charge fractions of Fe^<2+> adsorbed on the surface sites: E_<Fe> indicating that the selectivity of Fe^<2+> to the suface of the mineral was similar to that of Ca^<2+>. These results implied that the solution systems composed of the Fe(II)-bentonite and the Ca-bentonite can be regarded as an thermodynamically ideal behaviors. The average KGT values of Mn^<2+> in Ca-bentnite also approximated 1.44 with a range of 0.78 - 2.04, confirming that Mn^<2+> can be uniformaly adsorbed on the surface of the clay mineral with the similar selectivity to alkaline-earth ions.
日本粘土学会の論文
2002-08-24