Perturbation induced by EDTA on HDO, Br- and EuIII diffusion in a large-scale clay rock sample

被引：12

作者：

Dagnelie, R. V. H. ^{[1
]}

Arnoux, P. ^{[1
]}

Radwan, J. ^{[1
]}

Lebeau, D. ^{[2
]}

Nerfie, P. ^{[1
]}

Beaucaire, C. ^{[1
]}

机构：

[1] CEA, DEN, Lab Radionucl Migrat Measurements & Modelling, DANS,DPC, F-91191 Gif Sur Yvette, France

[2] CEA, Lab Radiolysis & Organ Matter, DEN, DANS,DPC, F-91191 Gif Sur Yvette, France

来源：

APPLIED CLAY SCIENCE | 2015年 / 105卷

关键词：

Diffusion; Sorption; Clay; EDTA; Anisotropy; Large-scale; CALLOVO-OXFORDIAN CLAY; ORGANIC-MATTER; MEUSE/HAUTE-MARNE; MONT TERRI; WATER; ADSORPTION; SORPTION; ACID; COEFFICIENTS; DISSOLUTION;

D O I：

10.1016/j.clay.2014.12.004

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Clay rocks are widely studied in the context of waste landfill leachates or as geological barriers for nuclear waste management. The release of organic co-contaminants by wastes may alter clay rocks, depending on the ratio between the volume of wastes and the mass of rock. In this work, a 10 mM EDTA plume was injected in a large-scale clay rock sample with a low V/m ratio (<<1.0 L kg(-1)) close to environmental conditions. The chemical perturbation was monitored for 450 days, as well as its effect on HDO, Br-, and Eu-III diffusion. Alteration of carbonates and iron-rich phases was evidenced in addition to the decrease of tracer concentration. Negatively charged complexes of EDTA and Eu are slightly adsorbed on minerals surface and display a desorption hysteresis. Transport parameters including diffusion anisotropy of HDO, Br, and EDTA complexes are estimated. Results are discussed with emphasis on determination of the mechanisms governing such a perturbation and the corresponding transitory state. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：142 / 149

页数：8

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