The effect of sub-zero temperature cycling on the flux of mercury from soils

dc.contributor.advisorVan Heyst, Bill
dc.contributor.authorCorbett Hains, Hamish of Engineeringen_US of Guelphen_US of Applied Scienceen_US
dc.description.abstractMercury flux from frozen soils has been shown to increase during periods of temperature change in past field-experiments. Due to the nature of these experiments, the influence of individual environmental parameters on the flux of mercury during periods of changing temperature could not be identified. This research isolates both soil temperature and soil moisture content at subzero temperatures in order to determine the effect of both on mercury flux. The completed research observed the flux of total gaseous mercury from frozen soils in a dynamic flux chamber and scientific grade freezer using a Tekran 2537a mercury analyzer. Additionally, soil temperature, air temperature and relative humidity were recorded during experimentation. It was found that mercury flux from soils was suppressed significantly over some temperature ranges below 10°C. This research also found that periods of rapid positive change in soil temperature resulted in a significant increase in mercury flux from frozen soils. This effect, which saw spikes in mercury flux approach levels seen at room temperature, is proposed to be a result of physical changes in the soil during temperature change. This effect was exaggerated at lower temperatures and was found to be most prevalent at soil moisture contents around 60% of field capacity.en_US
dc.publisherUniversity of Guelphen_US
dc.rights.licenseAll items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectmercury fluxen_US
dc.subjectfrozen soilsen_US
dc.subjecttemperature changeen_US
dc.subjectenvironmental parametersen_US
dc.subjectsoil temperatureen_US
dc.subjectsoil moisture contenten_US
dc.subjectsubzero temperaturesen_US
dc.subjecttotal gaseous mercuryen_US
dc.titleThe effect of sub-zero temperature cycling on the flux of mercury from soilsen_US


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