Methylmercury and sulfate-reducing bacteria in mangrove sediments from
Jiulong River Estuary, China |
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Authors: | Hao Wu Zhenhua Ding Yang Liu Jinling Liu Haiyu Yan Jiayong Pan Liuqiang Li Huina Lin Guanghui Lin and Haoliang Lu |
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Institution: | 1. Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, and School of Life Sciences, Xiamen University,Xiamen 361005, China 2. Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, and School of Life Sciences, Xiamen University,Xiamen 361005, China;State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002,China;Key Laboratory of Nuclear Resources and Environment, East China Institute of Technology, Ministry of Education,Nanchang 330013,China 3. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China 4. Key Laboratory of Nuclear Resources and Environment, East China Institute of Technology, Ministry of Education, Nanchang 330013, China 5. Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, and School of Life Sciences, Xiamen University,Xiamen 361005, China;Key Laboratory of Nuclear Resources and Environment, East China Institute of Technology, Ministry of Education,Nanchang 330013,China |
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Abstract: | Estuaries are important sites for mercury (Hg) methylation, with sulfate-reducing bacteria (SRB) thought to be the main Hg
methylators. Distributions of total mercury (THg) and methylmercury (MeHg) in mangrove sediment and sediment core from Jiulong
River Estuary Provincial Mangrove Reserve, China were determined and the possible mechanisms of Hg methylation and their
controlling factors in mangrove sediments were investigated. Microbiological and geochemical parameters were also determined.
Results showed that SRB constitute a small fraction of total bacteria (TB) in both surface sediments and the profile of sediments. The
content of THg, MeHg, TB, and SRB were (350 150) ng/g, (0.47 0.11) ng/g, (1.4 1011 4.1 109) cfu/g dry weight (dw), and (5.0
106 2.7 106) cfu/g dw in surficial sediments, respectively, and (240 24) ng/g, (0.30 0.15) ng/g, (1.9 1011 4.2 1010) cfu/g
dw, and (1.3 106 2.0 106) cfu/g dw in sediment core, respectively. Results showed that THg, MeHg, TB, MeHg/THg, salinity
and total sulfur (TS) increased with depth, but total organic matter (TOM), SRB, and pH decreased with depth. Concentrations of
MeHg in sediments showed significant positive correlation with THg, salinity, TS, and MeHg/THg, and significant negative correlation
with SRB, TOM, and pH. It was concluded that other microbes, rather than SRB, may also act as main Hg methylators in mangrove
sediments. |
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Keywords: | mercury methylmercury sediment mangrove sulfate-reducing bacteria |
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