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Understanding Enhanced Microbial MeHg Production in Mining-Contaminated Paddy Soils under Sulfate Amendment: Changes in Hg Mobility or Microbial Methylators?
CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, and HKU-IHEP Joint Laboratory on Metallomics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China; College of Resources and Environment, Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, Fujian Agriculture and Forestry University, Fuzhou, Fujian China.
CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, and HKU-IHEP Joint Laboratory on Metallomics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.
State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, China; Environmental and Life Sciences Program (EnLS), Trent University, Peterborough, Ontario Canada.
School of Geographic Sciences, East China Normal University, Shanghai, China.
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2019 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 53, no 4, p. 1844-1852Article in journal (Refereed) Published
Abstract [en]

Elevated methylmercury (MeHg) production in mining-contaminated paddy soils, despite the high fraction of refractory HgS(s), has been frequently reported, while the underlying mechanisms are not fully understood. Here, we hypothesized that sulfate input, via fertilization, rainfall, and irrigation, is critical in mobilizing refractory HgS(s) and thus enhancing Hg methylation in mining-contaminated paddy soils. To test this hypothesis, the effects of sulfate amendment on Hg methylation and MeHg bioaccumulation in mining-contaminated soil-rice systems were examined. The results indicated 28-61% higher net MeHg production in soils under sulfate amendment (50-1000 mg kg-1), which in turn increased grain MeHg levels by 22-55%. The enhancement of Hg methylation by Hg mobilization in sulfate-amended soils was supported by two observations: (1) the increased Hg(aq) release from HgS(s), the dominant Hg species in the paddy soils, in the presence of sulfide produced following sulfate reduction and (2) the decreases of refractory HgS(s) in soils under sulfate amendment. By contrast, changes in the abundances/activities of potential microbial Hg methylators in different Hg-contaminated soils were not significant following sulfate amendment. Our results highlight the importance to consider enhanced Hg mobility and thus methylation in soils under sulfate amendment.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019. Vol. 53, no 4, p. 1844-1852
National Category
Soil Science Environmental Sciences related to Agriculture and Land-use
Identifiers
URN: urn:nbn:se:oru:diva-72378DOI: 10.1021/acs.est.8b03511ISI: 000459642500013PubMedID: 30636405OAI: oai:DiVA.org:oru-72378DiVA, id: diva2:1287421
Note

Funding Agency:

National Natural Science Foundation of China  U1432241  21377129  21777162  41673075

Available from: 2019-02-11 Created: 2019-02-11 Last updated: 2019-06-18Bibliographically approved

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Liem-Nguyen, Van

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