Effect of cation exchange on major cation chemistry in the large scale redox experiment at Aespoe
Predicting the chemical changes that result from excavating a repository below the groundwater table in granitic terrain is a major focus of the SKB geochemistry program. The modeling study presented here demonstrates that cation exchange can play a major role in controlling the fluid chemistry that results when groundwaters of differing composition mix due to flow induced by excavation of the HRL tunnel. The major goal of this study was to assess whether an equilibrium cation exchange model could explain the composition of groundwater sampled from boreholes in the HRL tunnel. Given the consistency of the cation exchange hypothesis with observations, geochemical modeling was used to assess whether the quantity of exchanger necessary to match model results and observation was physically reasonable. The impact of mineral dissolution and precipitation on fluid chemistry was also evaluated. Finally, the compositions of exchanger phases expected to be in equilibrium with various Aespoe groundwaters were predicted.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 215886
- Report Number(s):
- UCRL-JC-118592; CONF-9406401-1; ON: DE96008910
- Resource Relation:
- Conference: ASPO international geochemistry workshop, Aspo (Sweden), 2-3 Jun 1994; Other Information: PBD: Oct 1994
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of cation exchange of major cation chemistry in the large scale redox experiment at Aspo. Revision 1
The role of cation exchange in controlling groundwater chemistry at Aspo, Sweden