【摘 要】
：
Impounded reservoirs which are recognized as the mercury(Hg)sensitive ecosystem are important Hot Spots for research.Fish-farming on reservoirs may lead o eutriophication and high organic matter in aq
【机 构】
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State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Scie
【出 处】
：
The 17th International Conference on Heavy Metals in the Env
论文部分内容阅读
Impounded reservoirs which are recognized as the mercury(Hg)sensitive ecosystem are important Hot Spots for research.Fish-farming on reservoirs may lead o eutriophication and high organic matter in aquatic system,and multiple physical and chemical water paramates will be changed,such as anoxic,high surfide,organic matter and anaerobic microorganism increase in sediment.which may be influenced the concentration and distribution of methylmercury in the aquatic system.The main research topics of this work is to understand the production and distribution of species of mercury and other related physical-chemical parameters between cage culture and reference sites in sediments at the reservoir.At the same time to know the relationship between methylation of mercury and chemical parameters(such as organic matter(OM),DOC,total phosphorus(TP),total nitrogen(TN),Sulfidion(S2-),sulfate(SO42-))which may have been affected by the cage culture or the season reasons.For this,the top 10cm sediment samples were collected from four fish-farming sites(FS)and corresponding reference sites(RS)in Wujiangdu reservoir(WJR)in September,2010 and March,2011.The main conclusions obtained as follow,1.In sediment,the concentration of TN,TP and OM in FS was higher than RS.The concentration of MeHg,TN,TP and OM%in the top layer was higher than that in the deeper layer.The concentration of THg and MeHg in FS was not significantly different from RS(for THg: n=40,T=0.945 and for MeHg: n=40,T=0.492).2.In pore water,the concentration of DMeHg in FS is higher than that in RS(n=40,T=0.179)which is similar with DMeHg/DHg%.DMeHg in FS(0.96 ± 0.86 ng?L-1)was higher 68.4%than it in RS(0.57 ± 0.84 ng?L-1)in warm season,DMeHg in FS(0.26 ± 0.11 ng?L-1)was higher 36.8%than it in FS(0.19 ± 0.07 ng?L-1)in cool season.3.Physical-chemical parameters are variable with different seasons.In cool season the concentration of SO42-is suitable for methylation of Hg.Similarly,DOC has positive correlation with DMeHg in pore water.4.The anaerobic condition in the deeper water caused by thermal stratification is an important factor affecting the methylation and distribution in summer.
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