Isotopic fractionation during ion filtration: I. Theory

Details Isotopic fractionation during ion filtration: I. Theory Isotopic fractionation during ion filtration: I. Theory

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51..683p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 51, Issue 3, pp.683-695

Computer Science

3

Scientific paper

Fractionation of the isotopes of H, O, and Cl during flow of aqueous solutions through semipermeable clay discs has been observed in the laboratory. The observed isotopic abundance trends of these elements in deep sedimentary basins have been attributed to similar phenomena. However, the mechanism responsible for such isotopic fractionation has not been identified. We propose that the fractionation of O and H isotopes in the water molecule results from increased activity of the heavy isotopic species in the membrane solution because high cation concentrations in the membrane pore fluid increase hydrationsphere fractionation effects. The heavy isotopic species thus diffuse away from the membrane and therefore are concentrated behind it. Predictions based on this theory satisfactorily model both laboratory and field observations. We propose that the fractionation of chlorine isotopes is a result of differences in the ionic mobility of 35 Cl - and 37 Cl - . Negative charges on the membrane repel the isotopic species at slightly different velocities against the uniform advective motion of the bulk water and thus the more mobile 35 Cl - is enriched behind the membrane. Predictions calculated from this theory compare well with laboratory and field data.

Affiliated with

Also associated with

No associations

Rating

Isotopic fractionation during ion filtration: I. Theory does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Isotopic fractionation during ion filtration: I. Theory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Isotopic fractionation during ion filtration: I. Theory will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1455589