Evasion of Elemental Mercury from a Boreal Peatland Suppressed by Long-Term Sulfate Addition

Fritsche, Johannes and Osterwalder, Stefan and Nilsson, Mats B. and Sagerfors, Jörgen and Åkerblom, Staffan and Bishop, Kevin and Alewell, Christine. (2014) Evasion of Elemental Mercury from a Boreal Peatland Suppressed by Long-Term Sulfate Addition. Environmental science & technology letters, Vol. 1, H. 10 , S. 421–425.

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Official URL: http://edoc.unibas.ch/dok/A6337735

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We investigated the evasion of TGM (total gaseous mercury) fromexperimental plots on a boreal peatland that had been exposed for 15 years todifferent combinations of atmospheric sulfur (S) and nitrogen (N) deposition as wellas greenhouse treatments simulating climate change. Shaded dynamic flux chambermeasurements during the summer in 2009 showed emission of TGM to theatmosphere from most of the treated plots (0.7 ± 0.94 ng m−2 h−1). However, TGMexchange rates were significantly lower, occasionally indicating Hg uptake, on plotssubjected to S addition at rates of 20 kg ha−1 year−1. Enhanced nitrogen depositionand greenhouse treatment had no significant effect on TGM fluxes. We hypothesizethat the lower Hg evasion from the sulfur-treated plots is related to either earlier Hgevasion or Hg binding to S in organic matter, making Hg less susceptible tovolatilization and more prone to transport in runoff.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Umweltgeowissenschaften (Alewell)
UniBasel Contributors:Osterwalder, Stefan and Alewell, Christine
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:06 Feb 2015 09:59
Deposited On:06 Feb 2015 09:59

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