Zn Isotope Fractionation during Sorption onto Kaolinite

Isotopes of zinc
DOI: 10.1021/acs.est.5b05347 Publication Date: 2016-01-13T18:57:28Z
ABSTRACT
In this study, we quantify zinc isotope fractionation during its sorption onto kaolinite, by performing experiments under various pH, ionic strength, and total Zn concentrations. A systematic enrichment in heavy isotopes on the surface of kaolinite was measured, with Δ66Znadsorbed-solution ranging from 0.11‰ at low pH strength to 0.49‰ high strength. Both measured concentration isotopic ratio are correctly described using a thermodynamic model that considers two binding sites: external basal surfaces edge sites. Based modeling approach, distinct factors were calculated: = 0.18 ± 0.06‰ for ion exchange sites, 0.49 specific complexation These indicate is dominantly controlled chemical composition solution (pH, strength).
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