Abstract
The evolution of porewater chemistry in bentonite was studied in solution-bentonite interaction experiments under anaerobic conditions at room temperature. The parameters varied were the bentonite density, bentonite-to-water ratio (b/w), ionic strength of the solution, and the composition of bentonite. At the end of the experiment, the equilibrating solution and the porewater squeezed out of the bentonite samples were analysed. This paper presents the preliminary experimental results of these ongoing studies.
The evolution of porewater chemistry was determined by the dissolving components initially present in the bentonite together with the ions coming with water from the surroundings. Ion-exchange processes occured between the exchangeable cations of montmorillonite and the cations in the water. The obtained concentrations in the external solution and porewater strongly depended on the b/w used. The concentrations in the squeezed porewaters were clearly lower than in the external waters and decreased with increasing density during squeezing.
The evolution of porewater chemistry was determined by the dissolving components initially present in the bentonite together with the ions coming with water from the surroundings. Ion-exchange processes occured between the exchangeable cations of montmorillonite and the cations in the water. The obtained concentrations in the external solution and porewater strongly depended on the b/w used. The concentrations in the squeezed porewaters were clearly lower than in the external waters and decreased with increasing density during squeezing.
| Original language | English |
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| Title of host publication | Scientific Basis for Nuclear Waste Management XXI |
| Editors | Ian McKinley, Charles McCombie |
| Place of Publication | Warrendale |
| Publisher | Materials Research Society |
| Pages | 415-422 |
| DOIs | |
| Publication status | Published - 1998 |
| MoE publication type | A4 Article in a conference publication |
| Event | MRS Symposium: Scientific Basis for Nuclear Waste Management XXI - Davos, Switzerland Duration: 23 Sept 1997 → 3 Oct 1997 |
Publication series
| Series | Materials Research Society Symposia Proceedings |
|---|---|
| Volume | 506 |
| ISSN | 0272-9172 |
Conference
| Conference | MRS Symposium: Scientific Basis for Nuclear Waste Management XXI |
|---|---|
| Country/Territory | Switzerland |
| City | Davos |
| Period | 23/09/97 → 3/10/97 |