State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
J Environ Sci (China). 2010;22(8):1189-94. doi: 10.1016/s1001-0742(09)60237-0.
Gaobeidian Lake, located in Beijing, China, serves as a recipient lake for effluents from a large municipal sewage treatment plant (MSTP). In order to evaluate the effects of discharging MSTP effluent on the mercury contamination of the local aquatic ecosystem, sediment cores, water, plankton, fish, and turtle samples were collected from Gaobeidian Lake for mercury speciation analysis. High concentrations of total mercury (T-Hg) were detected in sediment cores (5.24-17.0 microg/g dry weight (dw), average: 10.1 microg/g). The ratio of methylmercury (MeHg) to T-Hg was less than 0.3% in sediments and ranged from 35% to 76% in biota samples. The highest level of T-Hg and MeHg were found in aquatic bryophyte and crucian carp (3673 and 437 ng/g dw, respectively). The relative contents of MeHg were significantly correlated with trophic levels (R2 = 0.5506, p < 0.001), which confirmed that MeHg can be bio-transferred and biomagnified via food chain in this aquatic ecosystem.
高碑店湖位于中国北京，是一座接纳大型城市污水处理厂（MSTP）出水的湖泊。为了评估 MSTP 污水排放对当地水生态系统汞污染的影响，从高碑店湖采集了沉积物芯、水、浮游生物、鱼类和龟类样本，进行汞形态分析。在沉积物芯中检测到总汞（T-Hg）的高浓度（5.24-17.0μg/g 干重（dw），平均值：10.1μg/g）。沉积物中甲基汞（MeHg）与 T-Hg 的比例小于 0.3%，而在生物样本中范围为 35%-76%。T-Hg 和 MeHg 的最高水平出现在水生苔藓和鲫鱼中（分别为 3673 和 437ng/g dw）。MeHg 的相对含量与营养水平显著相关（R2=0.5506，p<0.001），这证实了 MeHg 可以通过食物链在该水生态系统中发生生物转化和生物放大。
