Pollution characteristics of mercury (Hg) in surface sediments of major basins,China |
| |
| Institution: | 1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;2. Department of Earth and Environmental Studies, Montclair State University, NJ 07043, USA;3. Department of Geography, College of Resources and Environmental Science, East China Normal University, Shanghai 200241, China;4. Institute of Geographic Engineering Technology, School of Geographical Science, Nantong University, Nantong 226007, China;1. State Key laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 99 Linchengxi Road, Guiyang, Guizhou 550081, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Meteorological Information Center of Guizhou, Guiyang 550002, China;1. College of Fisheries, Huazhong Agricultural University, Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, Wuhan 430070, China;2. Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Wuhan 430070, China;3. Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology of China, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China |
| |
| Abstract: | To investigate the pollution status and potential pollution risk of mercury (Hg) in China, surface sediment samples were collected from eight hundred and eighty-one sites, including ten major basins (Songhua River Basin (SRB), Liao River Basin (LRB), Hai River Basin (HRB), Yellow River Basin (YRB), Huai River Basin (HuRB), Yangtze River Basin (YtRB), Pearl River Basin (PRB), Southeastern River Basin (SeRB), Southwestern River Basin (SwRB) and Northwestern River Basin (NwRB)). Results showed that Hg concentrations in sediments of ten basins in China ranged from 0.001 to 8.800 mg/kg, with average ± S.D. value of 0.274 ± 0.675 mg/kg, which was obviously higher than Chinese soil background value (0.038 mg/kg) and Chinese sediment background value (0.040 mg/kg). The mean Hg concentration of ten basins decreased in the order of HRB > YtRB > SRB > PRB > HuRB > SwRB > YRB > SeRB > LRB > NwRB. Moreover, it was found that the Hg concentrations in the sediments of LRB, YtRB, PRB, SeRB and SwRB were partly driven by their total organic carbon (TOC) contents, while the effect of pH on the distribution of Hg was not obvious. The Hg concentration data were also compared with those got in other periods (1994–2015) to obtain the general variation tendency of Hg level. It was recorded that Hg concentrations in HRB have remained on high levels for a long history, while Hg contamination situation in YRB after 2004 has potentially turned to be better. The results of pollution assessment by sediment quality assessment guidelines (SQGs), contamination factor (CF), geoaccumulation index (Igeo) and potential ecological risk (Ei) suggested that YRB and HRB were the most seriously polluted river basins among the ten basins. It is urgent of constructing SQGs in China to scientifically evaluate the Hg pollution in the future. |
| |
| Keywords: | Mercury Sediments Pollution status Pollution assessment China |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
