Abstract
The MeHg content in the reed wetland soil of Liaohe was studied by the indoor-simulated constant temperature culture method. Under different aerobic and anaerobic conditions, the flooding salinity (CK, 0.5%, 1.0%, 1.5%, 2.0%) changes relationship whether SRB plays a leading role in the formation of MeHg. The results showed that under aerobic conditions, the content of MeHg in the surface layer and the bottom layer showed a trend of decreasing first and then increasing with the increase of culture time. Both of them have a lower MeHg content when the flooding salinity is 2.0%. The number of SRB bacteria showed a trend of “upgrading-depleting” with the increase of flooding salinity. Under anaerobic conditions, the MeHg content of surface and bottom soil changed slowly in the early stage of culture (the first 10 days), and the MeHg content increased rapidly after 15 days of culture, and decreased significantly on the 25th day. The number of SRB bacteria showed a trend of “depleting-upgrading” as the flooding salinity increased. Linear fitting showed that there was no obvious linear relationship between the change of MeHg content in soil and the number of SRB bacteria, and other microorganisms may play a role in methylation of mercury. Under anaerobic conditions, MeHg content in surface soil was significantly positively correlated with organic matter (p < 0.01), but negatively correlated with total mercury (p < 0.05). The mercury methylation process is affected by many environmental factors, and the mechanism of mercury methylation in different environments is different.
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References
Blum, P. W., Hershey, A. E., Tsui, M. T. K., et al. (2018). Methylmercury and methane production potentials in North Carolina Piedmont stream sediments. Biogeochemistry, 137(1–2), 181–195.
Bowles, K. C., Apte, S. C., Maher, W. A., et al. (2001). Bioaccumulation and biomagnification of mercury in Lake Murray, Papua New Guinea. Journal Canadien Des Sciences Halieutiques Et Aquatiques, 58(58), 888–897.
Boyd, E. S., Yu, R. Q., Barkay, T., et al. (2017). Effect of salinity on mercury methylating benthic microbes and their activities in Great Salt Lake, Utah. Science of the Total Environment, 581–582, 495–506.
Chen, R., Chen, H., Wang, D. Y., et al. (2016). Role of sulfate-reducing bacteria in mercury methylation in soil of the water-level-fluctuating zone of the Three Gorges Reservoir Area. Environmental Science, 37(10), 3774–3780.
Compeau, G., & Bartha, R. (1984). Methylation and demethylation of mercury under controlled redox, pH and salinity conditions. Applied and Environmental Microbiology, 48(6), 1203–1207.
Fleming, E. J., Erin, M. E., Green, P. G., & Nelson, D. C. (2006). Mercury methylation from unexpected sources: molybdate-inhibited freshwater sediments and an iron-reducing bacterium. Applied & Environmental Microbiology, 72(1), 457–464.
Gilmour, C. C., Elias, D. A., Kucken, A. M., et al. (2011). Sulfate-reducing bacterium Desulfovibrio desulfuricans ND132 as a model for understanding bacterial mercury methylation. Applied and Environmental Microbiology, 77(12), 3938–3951.
Hamelin, S., Amyot, M., Barkay, T., et al. (2011). Methanogens: principal methylators of mercury in Lake Periphyton. Environmental Science & Technology, 45(18), 7693–7700.
Harris, R., Kidd, K., & Shanley, J. (2008). Bridging the knowledge gaps on the sources, speciation, fate and bioaccumulation of mercury in aquatic and terrestrial environments. Environmental Pollution, 154(1), 1–2.
Jia, Q., Zhu, X. M., WANG, Q., et al. (2017). Effects of microbial activities on mercury methylation in farmland near mercury mining area. Environmental Science, 38(7), 3020–3027.
Li, H., Zheng, D. M., Yang, J. S., et al. (2019). Salinity and redox conditions affect the methyl mercury formation in sediment of Suaeda heteroptera wetlands of Liaoning province, Northeast China. Marine Pollution Bulletin, 14(2), 537–543.
Liang, L., Wang, Y. M., Zhang, C., et al. (2016). Effect of soil and dominant plants on mercury speciation in soil and water system of water-level-fluctuation zone in the Three Gorges Area. Environmental Science, 37(3), 955–962.
Louis, V. L. S., Rudd, J. W. M., Kelly, C. A., et al. (2004). The rise and fall of mercury methylation in an experimental reservoir. Environmental Science & Technology, 38(5), 1348–1358.
Peng, F. C., He, T. R., Li, Z. J., et al. (2018). Enrichment characteristics and risk assessment of Hg in bird feathers from Caohai wetland in Guizhou Province, China. Acta Geochimica, 37(4), 526–536.
Rothenberg, S. E., Windham-Myers, L., & Creswell, J. E. (2014). Rice methylmercury exposure and mitigation: a comprehensive review. Environmental Research, 133, 407–423.
Shao, D. D., Kang, Y., Wu, S. C., et al. (2012). Effects of sulfate reducing bacteria and sulfate concentrations on mercury methylation in freshwater sediments. Science of the Total Environment, 424, 331–336.
Sunderland, E. M., Gobas, F. A. P. C., Heyes, A., et al. (2004). Speciation and bioavailability of mercury in well-mixed estuarine sediments. Marine Chemistry, 90(1/4), 91–105.
Tessier, A., & Campbell, P. G. C. (1987). Partitioning of trace metals in sediments: relationships with bioavailability. Hydrobiologia, 149, 43–52.
Todorova, S. G., Driscoll, C. T., Effler, S. W., et al. (2014). Changes in the long-term supply of mercury species to the upper mixed waters of a recovering lake. Environmental Pollution, 185, 314–321.
Wang, Y. M., Yin, D. L., Xiang, Y. P., et al. (2019). A review of studies on the biogeochemical behaviors of mercury in the Three Gorges Reservoir, China. Bulletin of Environmental Contamination and Toxicology, 102(5), 686–694.
Xiao, Y., & Yang, J. S. (2015). Mechanization of soil organic carbon and its relationship with salinity in coastal wetland of Liaohe estuary. Chinese Journal of Ecology, 34(10), 2792–2798.
Yang, Q. K., Wang, X. R., Zhu, W. H., et al. (2015). Impact of chlorine salt on thermal desorption of mercury contaminated soils. Chinese Journal of Environmental Engineering, 9(5), 2479–2487.
Yin, Y. J., Allen, H. E., Huang, C. P., et al. (1997). Kinetics of mercury (II) adsorption and desorption on soil. Environmental Science & Technology, 31(2), 496–503.
Yuan, X. M., Yang, J. S., & Liu, K. (2017). Effects of salinity on DOC concentration and CO2 production of wetland soil in Liaohe estuarine. Chinese Journal of Ecology, 36(8), 2111–2117.
Zhao, L., Qiu, G. L., Anderson, C. W. N., et al. (2016). Mercury methylation in rice paddies and its possible controlling factors in the Hg mining area, Guizhou Province, Southwest China. Environmental Pollution, 215, 1–9.
Zheng, D. M., Zhang, Z. S., & Wang, Q. C. (2010). Total and methyl mercury contents and distribution characteristics in cicada, cryptotympana atrata (Fabricius). Bulletin of Environmental Contamination and Toxicology, 84(6), 749–753.
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Thanks to all those involved in this work.
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The authors are grateful to the support of the National Natural Science Foundation (41571085) and the Program for Innovative Talents of the Liaoning Higher Education Institution (LR2016078).
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Dongmei, Z., Shiwei, Z., Huanchi, M. et al. Simulation of Methylmercury Content and SRB Methylation in Phragmites australis Soil Under Different Salinity Conditions. Water Air Soil Pollut 231, 18 (2020). https://doi.org/10.1007/s11270-019-4382-8
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DOI: https://doi.org/10.1007/s11270-019-4382-8