Other
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.1537d&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 49, Issue 7, pp.1537-1544
Other
2
Scientific paper
Using trioctahedral smectites synthesized at low temperature (25 and 75°C). partition coefficients have been determined for M 2+ transition metals (Mn, Fe, Co, Ni, Cu, Zn) between octahedral sheets of smectites and water. These coefficients D ( M 2+ - Mg ) = ( M 2+ )/( Mg ) solid /( M 2+ )/( Mg ) liquid have high values near 10 4 for Cu, 1000 for Ni, Co, Zn, 300 for Fe and 30 for Mn. All transition metals are strongly stabilized in the magnesian solid phase, even Mn which leads to noncrystallized products. Within the range of experimental uncertainties, it is found that tetrahedral substitution of Si by Al and differences in temperature (from 25 to 75°C) have no influence on partition coefficients. Experimental data are closely related to thermodynamic properties of the cations and on this basis other partition coefficients can be calculated, for the ( M 2+ - Fe 2+ ) pair for instance. The behaviour of transition metals is explained using crystal field theory.
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