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    Kinetics of Methylmercury Production Revisited
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    Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, MS 6038, Oak Ridge, Tennessee 37831-6038, United States
    *E-mail: [email protected]. Tel: 865-574-6398. Fax: 865-576-8646.
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    Environmental Science & Technology

    Cite this: Environ. Sci. Technol. 2018, 52, 4, 2063–2070
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    https://doi.org/10.1021/acs.est.7b05152
    Published January 27, 2018
    Copyright © 2018 American Chemical Society
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    Abstract

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    Laboratory measurements of the biologically mediated methylation of mercury (Hg) to the neurotoxin monomethylmercury (MMHg) often exhibit kinetics that are inconsistent with first-order kinetic models. Using time-resolved measurements of filter passing Hg and MMHg during methylation/demethylation assays, a multisite kinetic sorption model, and reanalyses of previous assays, we show that competing kinetic sorption reactions can lead to time-varying availability and apparent non-first-order kinetics in Hg methylation and MMHg demethylation. The new model employing a multisite kinetic sorption model for Hg and MMHg can describe the range of behaviors for time-resolved methylation/demethylation data reported in the literature including those that exhibit non-first-order kinetics. Additionally, we show that neglecting competing sorption processes can confound analyses of methylation/demethylation assays, resulting in rate constant estimates that are systematically biased low. Simulations of MMHg production and transport in a hypothetical periphyton biofilm bed illustrate the implications of our new model and demonstrate that methylmercury production may be significantly different than projected by single-rate first-order models.

    Copyright © 2018 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.est.7b05152.

    • All data generated or analyzed during this study are included in the Supporting Information file. MATLAB files used in this study and the Mathematica files used to generate Figure 6 are available from the authors upon request. The Supporting Information includes details on the field-scale transport model, five additional figures and five tables (PDF)

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    This article is cited by 20 publications.

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    Environmental Science & Technology

    Cite this: Environ. Sci. Technol. 2018, 52, 4, 2063–2070
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.est.7b05152
    Published January 27, 2018
    Copyright © 2018 American Chemical Society
    Request reuse permissions

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