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dc.contributor.advisorNagy, Kathrynen_US
dc.contributor.authorStallings, Kimberly B.en_US
dc.date.accessioned2013-06-28T17:36:45Z
dc.date.available2013-06-28T17:36:45Z
dc.date.created2013-05en_US
dc.date.issued2013-06-28
dc.date.submitted2013-05en_US
dc.identifier.urihttp://hdl.handle.net/10027/9961
dc.description.abstractRedox-sensitive moieties in dissolved natural organic matter have been postulated to have a mechanistic role in the dissolution of the mercuric sulfide mineral cinnabar, a reaction that may increase the bioavailability of mercury. Under controlled reducing conditions, we investigated how hydroquinone, as a function of concentration and pH, affects the dissolution of cinnabar. Dissolution of cinnabar and reduction of Hg(II) were monitored with time by measuring aqueous Hg(II) in a reaction vessel and an inline oxidizing solution that captured gaseous Hg(0) released in the reaction. The amount of mercury released and the corresponding rate of release were not affected by the presence and concentration of hydroquinone or by changes in pH. However, we observed less dissolution of Hg(II) with increasing mass of cinnabar suggesting that particle aggregation effectively reduces the reactive surface area of the solid. Furthermore, dissolution ceased after a few hours of reaction and mercury spike-recovery experiments showed that Hg(II) adsorbed to the surface. Together, the results imply that particle aggregation and surface passivation of mercuric sulfide solids are important processes that contribute to the amount of mercury available for microbial methylation reactions across the oxic/anoxic regions of aquatic systems.en_US
dc.language.isoenen_US
dc.rightsCopyright 2013 Kimberly B. Stallingsen_US
dc.subjectdissolved organic matteren_US
dc.subjectcinnabaren_US
dc.subjectmercuryen_US
dc.titleMercury Release from Cinnabar in Water and Aqueous Solutions of Hydroquinone or Ascorbic Aciden_US
thesis.degree.departmentEarth and Environmental Sciencesen_US
thesis.degree.disciplineEarth and Environmental Sciencesen_US
thesis.degree.grantorUniversity of Illinois at Chicagoen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMS, Master of Scienceen_US
dc.type.genrethesisen_US
dc.contributor.committeeMemberMeyer-Dombard, D'Arcyen_US
dc.contributor.committeeMemberBogner, Jeanen_US
dc.type.materialtexten_US


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