INTERACTIONS BETWEEN NATURAL ORGANIC MATTER COMPOSITION AND MERCURY TRANSPORT IN A BOREAL WATERSHED

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dc.contributor.advisorHeyes, Andrewen_US
dc.contributor.authorGhorpade, Sarahen_US
dc.contributor.departmentMarine-Estuarine-Environmental Sciencesen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2011-02-19T07:14:31Z
dc.date.available2011-02-19T07:14:31Z
dc.date.issued2010en_US
dc.description.abstractNatural organic matter (NOM) composition affecting mercury (Hg) transport along a watershed transect were examined in the Lake 658 system at the Experimental Lakes Area, Canada. This watershed was dosed with an enriched stable isotope of Hg, allowing for distinction between recently deposited and historic Hg. Newly deposited Hg was not detected in significant quantities in upland flow or the lake, and occurred only in upper soil horizons, indicating that Hg has not reached steady state 8 years following deposition. Characterization of dissolved phase NOM was conducted by molecular weight fractionation, and analysis of absorbance properties and lignin phenols. Low molecular weight compounds were more mobile in the upland, while high molecular weight fractions contained more Hg. Spectral properties were not consistent predictors of Hg, but supported findings on molecular weight distribution. Source material composition, as indicated by lignin phenols, did not vary widely and was not correlated with Hg.en_US
dc.identifier.urihttp://hdl.handle.net/1903/11266
dc.subject.pqcontrolledEnvironmental Sciencesen_US
dc.subject.pquncontrolledmercuryen_US
dc.subject.pquncontrolledmercury transporten_US
dc.subject.pquncontrolledmolecular weight fractionationen_US
dc.subject.pquncontrolledorganic carbon compositionen_US
dc.titleINTERACTIONS BETWEEN NATURAL ORGANIC MATTER COMPOSITION AND MERCURY TRANSPORT IN A BOREAL WATERSHEDen_US
dc.typeThesisen_US

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