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Zn Isotope Fractionation during Sorption onto Kaolinite. | LitMetric

Zn Isotope Fractionation during Sorption onto Kaolinite.

Environ Sci Technol

Institut De Physique Du Globe De Paris-Sorbonne Paris Cite, Universite Paris Diderot, CNRS UMR 7154, Paris, France.

Published: February 2016

AI Article Synopsis

Article 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 Zn isotopes on the surface of kaolinite was measured, with Δ(66)Znadsorbed-solution ranging from 0.11‰ at low pH and low ionic strength to 0.49‰ at high pH and high ionic strength. Both the measured Zn concentration and its isotopic ratio are correctly described using a thermodynamic sorption model that considers two binding sites: external basal surfaces and edge sites. Based on this modeling approach, two distinct Zn isotopic fractionation factors were calculated: Δ(66)Znadsorbed-solution = 0.18 ± 0.06‰ for ion exchange onto basal sites, and Δ(66)Znadsorbed-solution = 0.49 ± 0.06‰ for specific complexation onto edge sites. These two distinct factors indicate that Zn isotope fractionation is dominantly controlled by the chemical composition of the solution (pH, ionic strength).

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http://dx.doi.org/10.1021/acs.est.5b05347DOI Listing

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