Sorption effects on cation diffusion in compacted bentonite

被引：55

作者：

Eriksen, TE ^{[1
]}

Jansson, M ^{[1
]}

Molera, M ^{[1
]}

机构：

[1] Royal Inst Technol, Dept Chem, S-10044 Stockholm, Sweden

来源：

ENGINEERING GEOLOGY | 1999年 / 54卷 / 1-2期

关键词：

bentonite; caesium; cation; cobalt; diffusion; sodium; sorption; strontium;

D O I：

10.1016/S0013-7952(99)00078-2

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

Diffusion of Na+. Cs+, Co2+ and Sr2+ in bentonite compacted to a dry density of 1800 kg m(-3) and saturated with groundwaters and aqueous solutions of differing ionic strength have been studied experimentally using the through diffusion technique. Sorption experiments have been carried out under a wide range of pH and concentration of supporting electrolyte. The dependence of the apparent diffusivity of Na+, Cs+ and Sr2+, mainly sorbed by ion exchange, on the sorption intensity is accommodated by a model encompassing diffusion of the sorbed cations within the electrical double layer next to the mineral surface in addition to diffusion in the pore water. The apparent diffusivity of Co2+, sorbed by surface complexation reactions, corresponds to complete immobilization on sorption. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：231 / 236

页数：6

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