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dc.contributor.authorLiu, Peng
dc.contributor.authorPtacek, Carol J
dc.contributor.authorBlowes, David W
dc.contributor.authorFinfrock, Y. Zou 19:23:01 (GMT) 19:23:01 (GMT)
dc.descriptionThe final publication is available at Elsevier via © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
dc.description.abstractA previous long-term microcosm experiment showed mercury (Hg) in the aqueous phase of contaminated sediment was effectively stabilized through the addition of biochar. The present study focuses on the application of synchrotron-related methods to evaluate the distribution and speciation of Hg in the biochar particles reacted for 235, 387, and 1030 days. The study provided more information on Hg stabilization mechanisms in addition to the information obtained by the previous studies. Confocal micro-X-ray fluorescence imaging (CMXRFI) and micro-X-ray fluorescence (micro-XRF) maps show that mercury co-exists with S, Cu, Fe, Mn, and Zn on the surface and inside the particles of biochar. Extended X-ray absorption fine structure (EXAFS) modeling shows that Hg is in an oxide form on the surface of an iron (hydro)oxide particle from fresh sediment and in Hg-sulfide forms in biochar samples. S X-ray absorption near-edge structure (XANES) analyses show that sulfide is present within the biochar particles. After amendment with biochars, a fraction of the Hg originally present in unstable forms (dissolvable, HgO, colloidal, nano, etc.) in the sediment was likely stabilized as less soluble Hg-sulfide phases on the surface or within the biochar particle. These results suggest Hg accumulation by the biochar particles renders it less potential for transport and bioavailability.en
dc.description.sponsorshipNatural Sciences and Engineering Research Councilen
dc.description.sponsorshipProgram of Geological Processesen
dc.description.sponsorshipResources and Environment in the Yangtze Basin, Grant CUGCJ1702en
dc.description.sponsorshipNational Natural Science Foundation of China, Grant 41877478en
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.subjectconfocal x-ray micro-fluorescence imagingen
dc.subjectsynchrotron-based techniquesen
dc.titleMercury distribution and speciation in biochar particles reacted with contaminated sediment up to 1030days: A synchrotron- based studyen
dcterms.bibliographicCitationLiu, P., Ptacek, C. J., Blowes, D. W., & Finfrock, Y. Z. (2019). Mercury distribution and speciation in biochar particles reacted with contaminated sediment up to 1030 days: A synchrotron-based study. Science of The Total Environment, 662, 915–922.
uws.contributor.affiliation1Science, Faculty ofen
uws.contributor.affiliation2Earth and Environmental Sciencesen

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