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Environmental Processes
Mercury Sorption and Desorption on Organo-mineral Particulates as a Source for Microbial Methylation Lijie Zhang, Shan Wu, Linduo Zhao, Xia Lu, Eric M. Pierce, and Baohua Gu Environ. Sci. Technol., Just Accepted Manuscript • DOI: 10.1021/acs.est.8b06020 • Publication Date (Web): 31 Jan 2019 Downloaded from http://pubs.acs.org on February 3, 2019
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Environmental Science & Technology
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Mercury Sorption and Desorption on Organo-mineral
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Particulates as a Source for Microbial Methylation
4 Lijie Zhang,1,¶ Shan Wu, 1,2,¶ Linduo Zhao,1 Xia Lu,1 Eric M. Pierce,1 and Baohua Gu1,3*
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37831, United States
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School of Resource, Environmental and Chemical Engineering, Nanchang University, Nanchang 330031, China
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Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN,
Department of Biosystems Engineering and Soil Science, University of Tennessee, Knoxville, TN, 37996, United States
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These authors contributed equally.
*Corresponding author: B. Gu; Phone: (865) 574 7286; Email:
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1 ACS Paragon Plus Environment
Environmental Science & Technology
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ABSTRACT
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In natural freshwater and sediments, mercuric mercury (Hg(II)) is largely associated
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with particulate minerals and organics, but it remains unclear under what conditions
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particulates may become a sink or a source for Hg(II), and whether the particulate-bound
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Hg(II) is bioavailable for microbial uptake and methylation. In this study, we investigated
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Hg(II) sorption-desorption characteristics on three organo-coated hematite particulates and a
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Hg-contaminated natural sediment and evaluated the potential of particulate-bound Hg(II)
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for microbial methylation. Mercury rapidly sorbed onto particulates, especially the cysteine-
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coated hematite and sediment, with little desorption observed (0.1–4%). However, the
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presence of Hg-binding ligands, such as low-molecular-weight thiols and humic acids,
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resulted in up to 60% of Hg(II) desorption from the Hg-laden hematite particulates, but
