Temperature and pH controls over isotopic fractionation during adsorption of boron on marine clay

Details Temperature and pH controls over isotopic fractionation during adsorption of boron on marine clay Temperature and pH controls over isotopic fractionation during adsorption of boron on marine clay

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.2319p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 51, Issue 9, pp.2319-2323

Physics

34

Scientific paper

The variation of adsorption constants and isotope fractionation with pH and temperature during the adsorption of B from seawater onto marine clay have been examined. The controls over adsorption are similar to those exhibited by pure clay minerals ( , 1976; and , 1981). The isotope fractionations are the result of equilibrium processes, not kinetic effects. Variations in the measured fractionation factor with pH arise from the differences between the isotope fractionation associated with adsorption of B(OH) 3 and B(OH) 4 - and the pH dependence of B speciation. The implications of these results for the distribution of B isotopes in seawater and sediment porewaters are briefly discussed.

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