Ultrafiltration by a compacted clay membrane-I. Oxygen and hydrogen isotopic fractionation
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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.
| 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 |
| DOI | 10.1016/0016-7037(73)90105-1 |
| Volume | 37 |
| Issue | 10 |
| Year Published | 1973 |
| Language | English |
| Publisher | Elsevier |
| Description | 16 p. |
| First page | 2295 |
| Last page | 2310 |
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