n107077SE Academic Article uri icon


  • Hyperfiltration of CaCO3 and NaHCO3 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 H2CO3-laden throughput solutions are enriched in 13C by 1.5%. relative to the 13C 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. 1987.

published proceedings

  • Geochimica et Cosmochimica Acta

author list (cited authors)

  • Fritz, S. J., Hinz, D. W., & Grossman, E. L.

publication date

  • January 1, 1987 11:11 AM