Physics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.1121f&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 51, Issue 5, pp.1121-1134
Physics
3
Scientific paper
Hyperfiltration of CaCO 3 and NaHCO 3 solutions through smectites induces chemical and isotopic fractionation of dissolved inorganic carbon (DIC). Early effluent solutions are enriched in carbonic acid and have DIC concentrations higher than the stock solutions from which they were derived. These H 2 CO 3 -laden throughput solutions are enriched in 13 C by 1.5%. relative to the 13 C of the influent DIC. Dynamic diffusion within the concentration polarization layer results in geometrically incongruent concentration profiles of a solute's light and heavy isotope-bearing species due to different diffusion coefficients of these species. The result is that the heavy / light ratio of a solute species is greater at the membrane's high-pressure interface than in the stock solution being hyperfiltrated. Thus, early effluent solutions are enriched in heavy species relative to the stock solution.
Fritz Steven J.
Grossman Ethan L.
Hinz David W.
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