Methylmercury declines in a boreal peatland when experimental sulfate deposition decreases

Environmental Science & Technology
Jill K Coleman WasikJames E Almendinger

Abstract

Between 2001 and 2008 we experimentally manipulated atmospheric sulfate-loading to a small boreal peatland and monitored the resulting short and long-term changes in methylmercury (MeHg) production. MeHg concentrations and %MeHg (fraction of total-Hg (Hg(T)) present as MeHg) in the porewaters of the experimental treatment reached peak values within a week of sulfate addition and then declined as the added sulfate disappeared. MeHg increased cumulatively over time in the solid-phase peat, which acted as a sink for newly produced MeHg. In 2006 a "recovery" treatment was created by discontinuing sulfate addition to a portion of the experimentally treated section to assess how MeHg production might respond to decreased sulfate loads. Four years after sulfate additions ceased, MeHg concentrations and %MeHg had declined significantly from 2006 values in porewaters and peat, but remained elevated relative to control levels. Mosquito larvae collected from each treatment at the end of the experiment exhibited Hg(T) concentrations reflective of MeHg levels in the peat and porewaters where they were collected. The proportional responses of invertebrate Hg(T) to sulfate deposition rates demonstrate that further controls on sulfur emissions...Continue Reading

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Citations

Oct 10, 2015·Environmental Science & Technology·Oded LevanoniFrauke Ecke
Nov 8, 2014·Environmental Toxicology and Chemistry·Lauren E Kinsman-CostelloStephen K Hamilton
Apr 20, 2016·The Science of the Total Environment·Gregory B LawrenceKaren Riva-Murray
Apr 23, 2016·The Science of the Total Environment·Collin A Eagles-SmithColleen Flanagan Pritz
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May 26, 2016·Environmental Science. Processes & Impacts·Nathan W JohnsonMichael E Berndt
Aug 14, 2020·The Science of the Total Environment·Mae Sexauer GustinTong Zhang
Feb 11, 2015·Environmental Science & Technology·Kristofer R RolfhusGregory Perrine
May 20, 2014·Environmental Science & Technology·Mark E BrighamJames G Wiener
Mar 1, 2018·Environmental Science & Technology·Jeff D JeremiasonJames B Cotner

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