Distribution and speciation of mercury in surficial sediments from main mangrove wetlands in China |
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| Authors: | ZH Ding JL Liu LQ Li HN Lin H Wu ZZ Hu |
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| Institution: | aKey Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, and School of Life Sciences, Xiamen University, 422# South Siming Road , Xiamen 361005, Fujian Province , China;bKey Laboratory of Nuclear Resources and Environment, East China Institute of Technology, Ministry of Education, Nanchang 330013, China;cState Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China |
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| Abstract: | The purpose of this study was to establish the distribution, speciation and bioavailability of mercury in mangrove sediments. A systemic survey of surficial sediments from 13 mangrove wetlands of China was carried out. Hg concentrations ranged from 2.3–903.6 ng g−1, with an average value of 189.4 ng g−1. Of the 13 areas surveyed, the Hg content in sediments was similar to background levels in 6 areas but was much higher in the other seven areas. Hg levels were affected by natural and anthropogenic factors, including terrestrial pollutants, geomorphic properties, and indirectly by economic status. Hg levels were positively correlated with organic matter, pH, and silt and clay fractions, but Hg was negatively correlated with sand fraction. In most mangrove wetlands, Hg existed primarily in the form of volatile Hg. Hg is easily bioaccumulated in mangrove wetlands and may be the natural source of Hg emissions to the atmosphere. |
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| Keywords: | Mangrove Mercury Sediment Distribution Speciation China |
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