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Geochemical Model of the Granite-Bentonite-Groundwater at Äspö (LOT Experiment)

Published online by Cambridge University Press:  01 February 2011

C. Domènech ,
D. Arcos ,
J. Bruno ,
O. Karnland  and
A. Muurinen
C. Domènech
Affiliation:
ENVIROS SPAIN, P. de Rubí, 29–31, Valldoreix. 08197 Spain (darcos@enviros.biz)
D. Arcos
Affiliation:
ENVIROS SPAIN, P. de Rubí, 29–31, Valldoreix. 08197 Spain (darcos@enviros.biz)
J. Bruno
Affiliation:
ENVIROS SPAIN, P. de Rubí, 29–31, Valldoreix. 08197 Spain (darcos@enviros.biz)
O. Karnland
Affiliation:
Clay Technology AB, IDEON Research Center, Lund, Sweden.
A. Muurinen
Affiliation:
VTT, Espoo, Finland.
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Abstract

A geochemical modelling of one of the experimental parcels of the LOT experiment (Äspö, Sweden) is presented. The model consists on a 2D reactive transport model of a perpendicular section of the experimental borehole with a stationary temperature gradient ranging from 130 to 15°C. The results of the model show that temperature has an important effect on the geochemical evolution of the system. Due to the temperature effect, anhydrite replaces gypsum and hematite precipitates instead of Fe(OH)3(am). Calcite and siderite dissolve in the warmer part of bentonite; whereas a major replacement of Na by Ca in the bentonite takes place close to the bentonite-granite boundary. pH is buffered by the equilibrium with calcite, although the effect of temperature leads to a decrease in pH.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 807: Symposium Scientific Basis for Nuclear Waste Management XXVII , 2003 , 855
Copyright
Copyright © Materials Research Society 2004

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References

REFERENCES

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