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《Quaternary Sciences》 2008-04
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SEDIMENT LEAD POLLUTION RECORDS FROM LAKES AT THE MIDDLE AND LOWER REACHES OF CHANGJIANG RIVER BASIN:CASE STUDY IN HONGHU,GUCHENGHU,AND TAIHU LAKES

Yao Shuchun Xue Bin Zhu Yuxin Xia Weilan Li Shijie(State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing210008)  
Sedimentary cores were collected from Honghu Lake,Guchenghu Lake,and Taihu Lake during 2002-2005.The total organic carbon(TOC)and metals(Pb,Al,Fe,and Ti)were analyzed.Combined with 137Cs or 210Pbdating method,average sedimentation rates were calculated,which are 0.15cm/a at Honghu Lake,0.067cm/a at Guchenghu Lake,and 0.35-0.41cm/a at Taihu Lake.Regression model between lead and geogenic tracer elements and TOC concentration were established.The relationship between lead and geogenic tracer elements or TOC were significant(p0.001).Pb contamination was estimated based on the natural contribution using regression model.The results imply anthropogenic lead in the three lakes.The onset of lead pollution was estimated to be in the early 1970s based on sedimentations from 137Cs or 210Pb dating method.It reveals the possibility of using lead as a time marker.The lead concentrations of Taihu Lake core are generally higher than those of the other two lakes.However,anthropogenic lead load to Guchenghu and Honghu has been increased in the recent 3 decades,which should cause the attention of scientists and lake managers.
【Fund】: 国家自然科学基金项目(批准号:40771197和40472085);; 江苏省自然科学基金项目(批准号:BK2007534)资助
【CateGory Index】: X524
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