Abstract
Biogeochemical cycling of sulfur and selenium (Se) could play an important role in methylmercury (MeHg) dynamics in soil, while their potential effects on MeHg production in rice paddy soil are less understood. The main objective of this study was to explore the effects of sulfate and selenite on net MeHg production in contaminated rice paddy soil, characterized with massive MeHg production and thus MeHg accumulation in rice. A series of microcosm incubation experiments were conducted using a contaminated paddy soil amended with sulfate and/or selenite, in which sulfate-reducing bacteria were mainly responsible for MeHg production. Our results demonstrated that sulfate addition reduced solid and dissolved MeHg levels in soils by ≤18 and ≤25 %, respectively. Compared to sulfate, selenite was more effective in inhibiting net MeHg production, and the inhibitory effect depended largely on amended selenite doses. Moreover, sulfate input played a dual role in affecting Hg-Se interactions in soil, which could be explained by the dynamics of sulfate under anoxic conditions. Therefore, the effects of sulfate and selenium input should be carefully considered when assessing risk of Hg in anoxic environments (e.g., rice paddy field and wetland).
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Acknowledgments
Financial support was provided to Huan Zhong by the National Natural Science Foundation of China (41273087). Ping Li was supported by the National Natural Science Foundation of China (41373135). And financial support was provided to Fei Dang by the Natural Science Foundation of Jiangsu Province (BK20131041). Finally, we are grateful for the valuable comments from anonymous reviewers on this work.
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Wang, Y., Dang, F., Zhong, H. et al. Effects of sulfate and selenite on mercury methylation in a mercury-contaminated rice paddy soil under anoxic conditions. Environ Sci Pollut Res 23, 4602–4608 (2016). https://doi.org/10.1007/s11356-015-5696-8
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DOI: https://doi.org/10.1007/s11356-015-5696-8