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Solid-waste Au/Hg microelectrode for the investigation of Fe and Mn cycling in a freshwater wetland: Implications for methane production

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dc.contributor.author Ma, S. en
dc.contributor.author Luther, G. W. en
dc.contributor.author Keller, J. en
dc.contributor.author Madison, A. S. en
dc.contributor.author Metzger, E. en
dc.contributor.author Emerson, D. en
dc.contributor.author Megonigal, J. Patrick en
dc.date.accessioned 2012-03-20T12:32:44Z
dc.date.available 2012-03-20T12:32:44Z
dc.date.issued 2008
dc.identifier.citation Ma, S., Luther, G. W., Keller, J., Madison, A. S., Metzger, E., Emerson, D., and Megonigal, J. Patrick. 2008. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F18210">Solid-waste Au/Hg microelectrode for the investigation of Fe and Mn cycling in a freshwater wetland: Implications for methane production</a>." <em>Electroanalysis</em>. 20:233&ndash;239. en
dc.identifier.uri http://hdl.handle.net/10088/18210
dc.description.abstract The solid-state voltammetric gold-amalgam microelectrode was used to measure multiple redox species (O, S, Fe and Mn) in situ at (sub)millimeter vertical resolution to elucidate rhizosphere processes in Jug Bay wetlands. In vegetated soil, a classic diagenetic redox sequence without any dissolved sulfide was observed in summer. However, the rhizosphere can be quite variable which is due to the introduction of O2 to the anoxic sediments by plants. In nonvegetated soil, the vertical concentration-depth profiles were relatively constant. The presence of Fe(II), Mn(II) and soluble Fe(III) in deeper sediments indicates the oxidation of Fe(II) as well as the nonreductive dissolution of Fe(III) and the reductive dissolution of Fe(III) and Mn(III, IV) solids. Mn(III, IV) and Fe(III) redox chemistry is important in organic matter mineralization mediated by bacteria and in suppressing methane formation. In addition, Mn(III, IV) also can oxidize Fe(II) to supply Fe(III) for bacterial Fe(III) reduction. Studying Fe and Mn cycling via voltammetric methods can give insights to methane production and loss as there is no methane sensor for sediment work at present. en
dc.relation.ispartof Electroanalysis en
dc.title Solid-waste Au/Hg microelectrode for the investigation of Fe and Mn cycling in a freshwater wetland: Implications for methane production en
dc.type Journal Article en
dc.identifier.srbnumber 74521
rft.jtitle Electroanalysis
rft.volume 20
rft.spage 233
rft.epage 239
dc.description.SIUnit serc en
dc.citation.spage 233
dc.citation.epage 239


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