Mercury Sorption and Desorption on Organo-Mineral Particulates as a Source for Microbial Methylation

Zhang, Lijie; Wu, Shan; Zhao, Linduo; Lu, Xia; Pierce, Eric M.; Gu, Baohua

doi:10.1021/acs.est.8b06020

Mercury Sorption and Desorption on Organo-Mineral Particulates as a Source for Microbial Methylation

Journal Article · Thu Jan 31 04:00:00 EST 2019 · Environmental Science and Technology

DOI:https://doi.org/10.1021/acs.est.8b06020· OSTI ID:1509536

Zhang, Lijie ^[1]; Wu, Shan ^[2]; ^[1]; ^[1]; ^[1]; ^[3]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Environmental Sciences Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Environmental Sciences Division; Nanchang Univ., Nanchang (China). School of Resource, Environmental and Chemical Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Environmental Sciences Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Biosystems Engineering and Soil Science

In natural freshwater and sediments, mercuric mercury (Hg(II)) is largely associated with particulate minerals and organics, but it remains unclear under what conditions particulates may become a sink or a source for Hg(II) and whether the particulate-bound Hg(II) is bioavailable for microbial uptake and methylation. In this study, we investigated Hg(II) sorption–desorption characteristics on three organo-coated hematite particulates and a Hg-contaminated natural sediment and evaluated the potential of particulate-bound Hg(II) for microbial methylation. Mercury rapidly sorbed onto particulates, especially the cysteine-coated hematite and sediment, with little desorption observed (0.1–4%). However, the presence of Hg-binding ligands, such as low-molecular-weight thiols and humic acids, resulted in up to 60% of Hg(II) desorption from the Hg-laden hematite particulates but <6% from the sediment. Importantly, the particulate-bound Hg(II) was bioavailable for uptake and methylation by a sulfate-reducing bacterium Desulfovibrio desulfuricans ND132 under anaerobic incubations, and the methylation rate was 4–10 times higher than the desorption rate of Hg(II). These observations suggest direct contacts and interactions between bacterial cells and the particulate-bound Hg(II), resulting in rapid exchange or uptake of Hg(II) by the bacteria. The results highlight the importance of Hg(II) partitioning at particulate–water interfaces and the role of particulates as a significant source of Hg(II) for methylation in the environment.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1509536

Journal Information:: Environmental Science and Technology, Journal Name: Environmental Science and Technology Journal Issue: 5 Vol. 53; ISSN 0013-936X

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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