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Spatial trend and pollution assessment of total mercury and methylmercury pollution in the Pearl River Delta soil, South China |
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| Authors: | Chen Laiguo Xu Zhencheng Ding Xiaoyong Zhang Weidong Huang Yumei Fan Ruifang Sun Jiaren Liu Ming Qian Donglin Feng Yongbin |
| Institution: | a Center for Research on Urban Environment, South China Institute of Environmental Sciences (SCIES), Ministry of Environmental Protection, Guangzhou 510655, China b Chongqing Academy of Environmental Science, Chongqing 400020, China c Key Laboratory of Ecology and Environmental Science in Guangdong Higher Education, College of Life Science, South China Normal University, Guangzhou 510631, China |
| Abstract: | Total mercury (THg) and methylmercury (MeHg) were measured in large number of soil samples collected from areas with different types of land use, different depth in the Pearl River Delta (PRD) of South China. THg and MeHg concentrations ranged from 16.7 to 3320 ng g−1 and 0.01 to 1.34 ng g−1, respectively. THg levels are highest in the top 0-20 cm soil layer, and decrease from the surface to bottom layer soil. Spatial variation was observed with different types of land use. Urban parks had the highest concentrations and the other areas tended to decrease in the order of residential areas, industrial areas, vegetable fields, cereal fields, and woodlands. Temporal variation was also noted, and two relatively high THg contamination zones located in the northwestern part of the PRD have significantly expanded over the last two decades. Both THg and MeHg concentrations were correlated significantly with soil organic matter (OM), but not with soil pH. THg pollution status was evaluated using two assessment methods. |
| Keywords: | Mercury Methylmercury Soil The Pearl River Delta |
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