Mercury speciation and spatial distribution in surface waters of the Yarlung Zangbo River,Tibet  

作　　者：ZHENG Wei KANG ShiChang FENG XinBin ZHANG QiangGong LI ChaoLiu 

机构地区：[1]Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences Beijing 100085, China [2]Academy for Environmental Planning, Ministry of Environmental Protection, Beijing 100012, China [3]The State Key Laboratory of Cryospheric Sciences, Lanzhou 730000, China [4]The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China

出　　处：《Chinese Science Bulletin》2010年第24期2697-2703,共7页

基　　金：supported by the National Natural Science Foundation of China(40903050and 40830743);the National Basic Research Program of China(2005CB422004);the State Key Laboratory of Cryospheric Sciences(SKLCS-ZZ-2008-01 and SKLCS09-06)

摘　　要：The Yarlung Zangbo River is the highest river in the world.It flows from west to east through the southern part of Tibet.The mercury(Hg)speciation and distribution in surface waters and soils near the bank of the Yarlung Zangbo River and its two tributaries,the Lhasa and Niyang Rivers,were investigated in June 2007.Simultaneously,major water quality parameters were also measured at the same stations.Total Hg(THg)and total methylmercury(TMeHg)concentrations in surface waters of the Yarlung Zangbo River ranged from 1.46 to 4.99 ng/L and from 0.06 to 0.29 ng/L,respectively,representing the background levels in river systems of the Tibetan Plateau.Particulate Hg(PHg)accounted for 69%of the THg,and the two Hg species had a significant relationship(r=0.990,P<0.01).Approximately 61%of the spatial distribution of THg was controlled by the concentrations of total suspended particles(TSP).Reactive Hg(RHg)concentrations ranged from 0.10 to 0.36 ng/L,and this fraction may play a weak role in terms of the transport and fate of Hg in surface waters.Dissolved methylmercury(DMeHg)constituted 71%of the TMeHg and was significantly correlated with TMeHg(r=0.746,P<0.01).The spatial distribution of TMeHg is not strongly affected by environmental factors such as THg,RHg,temperature,pH,dissolved organic carbon(DOC),and TSP.In addition,the inflow of both the Lhasa and Niyang Rivers probably influences the concentrations of THg in surface waters of the mainstream, but such an effect is not obvious for TMeHg.The Yarlung Zangbo River is the highest river in the world. It flows from west to east through the southern part of Tibet. The mercury （Hg） speciation and distribution in surface waters and soils near the bank of the Yarlung Zangbo River and its two tributaries, the Lhasa and Niyang Rivers, were investigated in June 2007. Simultaneously, major water quality parameters were also measured at the same stations. Total Hg （THg） and total methylmercury （TMeHg） concentrations in surface waters of the Yarlung Zangbo River ranged from 1.46 to 4.99 ng/L and from 0.06 to 0.29 ng/L, respectively, representing the background levels in river systems of the Tibetan Plateau. Particulate Hg （PHg） accounted for 69% of the THg, and the two Hg species had a significant relationship （r=0.990, P〈0.01）. Approximately 61% of the spatial distribution of THg was controlled by the concentrations of total suspended particles （TSP）. Reactive Hg （RHg） concentrations ranged from 0.10 to 0.36 ng/L, and this fraction may play a weak role in terms of the transport and fate of Hg in surface waters. Dissolved methylmercury （DMeHg） constituted 71% of the TMeHg and was significantly correlated with TMeHg （r=-0.746, P〈0.01）. The spatial distribution of TMeHg is not strongly affected by environmental factors such as THg, RHg, temperature, pH, dissolved organic carbon （DOC）, and TSP. In addition, the inflow of both the Lhasa and Niyang Rivers probably influences the concentrations of THg in surface waters of the mainstream, but such an effect is not obvious for TMeHg.

关 键 词：雅鲁藏布江 空间分布 西藏南部 地表水 甲基汞 形态 溶解有机碳 总悬浮微粒 

分 类 号：P342[天文地球—水文科学]