| Surficial sediment samples were collected from main mangrove wetlands of China, mercury, pH, salinity, organic matters, grain size, Fe/Hg, Mn/Hg were analyzed. Mercury content ranges from 2.3 to 903.6 ng·g-1, with a average of (197±137.6)ng·g-1. Compared with local background level, serious Hg pollution with high Hg content was found in 7 areas, including Luoyangqiao ［(467.5±68.8) ng·g-1］, Fugong ［(438.2±147.0) ng·g-1］, Ewan ［(264.3±89.2) ng·g-1］, Yaojiayu ［(125.4±27.1)ng·g-1］, Fujian Province; Sanya ［(164.8±143.9)ng·g-1］, Dongzhaigang ［(314.1±335.7) ng·g-1］, Hainan Province, Shenzhen ［(179.9±7.7) ng·g-1］, Guangdong Province. Hg content was similar with background value in the other 6 areas, including Yunxiao ［(63.3±43.9)ng·g-1］, Fujian Province; Gaoqiao ［(178.6±127.0)ng·g-1］, Guangdong Province; Daguansha ［(26.1±18.8) ng·g-1］, Shankou ［(73.8±21.1) ng·g-1］, Beilun estuary ［(117.8±51.4) ng·g-1］, Qinzhou Bay ［(147.5±107.6)ng·g-1］, Guangxi Autonomous Region. Discrepancy of total Hg concentrations in mangrove wetlands is due to many environmental factors and human activities. Parameters such as grain size, pH, organic matter, Fe/Hg, Mn/Hg are significantly correlated with total Hg respectively. Clay and Fe/Hg are obvious factors influencing total Hg concentration. Impact of environmental factors on mercury can be showed by regression equation. |
