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Ultrafiltration by a compacted clay membrane-I. Oxygen and hydrogen isotopic fractionation

Geochimica et Cosmochimica Acta

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Abstract

Laboratory experiments were carried out to determine the magnitude of the isotopic fractionation of distilled water and of 0.01 N NaCl forced to flow at ambient temperature under a hydraulic pressure drop of 100 bars across a montmorillonite disc compacted to a porosity of 35 per cent by a pressure of 330 bars. The ultrafiltrates in both experiments were depleted in D by 2.5%. and in O18 by 0.8%. relative to the residual solution. No additional isotopic fractionation due to a salt filtering mechanism was observed at NaCl concentrations up to 0.01 N. Adsorption is most likely the principal mechanism which produces isotopic fractionation, but molecular diffusion may play a minor role. The results suggest that oxygen and hydrogen isotopic fractionation of ground water during passage through compacted clayey sediments should be a common occurrence, in accord with published interpretations of isotopic data from the Illinois and Alberta basins. ?? 1973.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Ultrafiltration by a compacted clay membrane-I. Oxygen and hydrogen isotopic fractionation
Series title:
Geochimica et Cosmochimica Acta
Volume
37
Issue:
10
Year Published:
1973
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geochimica et Cosmochimica Acta
First page:
2295
Last page:
2310