Mercury isotope fractionation during precipitation of metacinnabar (β-HgS) and montroydite (HgO)

Environmental Science & Technology
Robin S SmithRuben Kretzschmar

Abstract

To utilize stable Hg isotopes as a tracer for Hg cycling and pollution sources in the environment, it is imperative that fractionation factors for important biogeochemical processes involving Hg are determined. Here, we report experimental results on Hg isotope fractionation during precipitation of metacinnabar (β-HgS) and montroydite (HgO). In both systems, we observed mass-dependent enrichments of light Hg isotopes in the precipitates relative to the dissolved Hg. Precipitation of β-HgS appeared to follow equilibrium isotope fractionation with an enrichment factor ε(202)Hg(precipitate-supernatant) of -0.63‰. Precipitation of HgO resulted in kinetic isotope fractionation, which was described by a Rayleigh model with an enrichment factor of -0.32‰. Small mass-independent fractionation was observed in the HgS system, presumably related to nuclear volume fractionation. We propose that Hg isotope fractionation in the HgS system occurred in solution during the transition of O- to S-coordination of Hg(II), consistent with theoretical predictions. In the HgO system, fractionation was presumably caused by the faster precipitation of light Hg isotopes, and no isotopic exchange between solid and solution was observed on the timescale in...Continue Reading

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Citations

Jan 21, 2016·Environmental Science & Technology·Patrick Michael DonovanMartin Tsz Ki Tsui
May 29, 2016·The Science of the Total Environment·Patrick M DonovanMartin T K Tsui
Mar 10, 2018·Environmental Science. Processes & Impacts·Jason D DemersBaohua Gu
May 11, 2021·Environmental Science. Processes & Impacts·Elizabeth R CrowtherMarcus W Johnson
Feb 16, 2018·Environmental Science & Technology·Ryan F LepakJames P Hurley
May 31, 2019·Environmental Science & Technology·Flora M BroczaJan G Wiederhold
Oct 9, 2021·Environmental Science & Technology·Qiang HuangJohn R Reinfelder

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