One century sedimentary record of lead and zinc pollution in Yangzong Lake, a highland lake in southwestern China  

作　　者：Enlou Zhang Enfeng Liu Ji Shen Yanmin Cao Yanling Li 

机构地区：[1]State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China

出　　处：《Journal of Environmental Sciences》2012年第7期1189-1196,共8页环境科学学报（英文版）

基　　金：supported by the Nanjing Institute of Geography & Limnology, the Chinese Academy of Sciences(No.NIGLAS2011KXJ002);the National Basic Research Program (973) of China (No. 2010CB950201,2012CB956104);the National Natural Science Foundation of China (No. 40772204, 41072267)

摘　　要：Reconstruction of trace metal pollution histories and sources may help us to regulate current pollutant discharge. This is especially important for the highland lakes in southwestern China, which are facing trace metals pollution. We present sedimentary records of 11 metals accumulated in Yangzong Lake since the 1870＇s, a highland lake in southwestern China. Pollution of lead and zinc （Pb and Zn） was differentiated based on principal component analysis, geochemical normalization, and lead isotope ratios. Nearly all the metals as well as grain size composition show generally constant values before the mid-1980＇s, denoting stable detrital input in the catchment. Fluctuations in the concentrations of the metals as well as grain size composition since the mid-1980＇s indicate an increase in soil erosion with strengthened human disturbance in the catchment. After geochemical normalization, Pb and Zn showed constant values before 1990 AD and then a gradual increase in parallel with the variations in 2~spb/~~6pb and 2~7pb/2~6pb ratios, indicating that Pb and Zn pollution occurred. Combining the data of 20PPb/206Ppb and 207Pb/206Pb ratios in the sediments of Yangzong Lake, leaded gasoline, Pb-Zn ore and coal, and consumption or production historical trends, we deduced that the enhanced Pb and Zn pollution in Yangzong Lake is caused primarily by ore mining and refining.Reconstruction of trace metal pollution histories and sources may help us to regulate current pollutant discharge. This is especially important for the highland lakes in southwestern China, which are facing trace metals pollution. We present sedimentary records of 11 metals accumulated in Yangzong Lake since the 1870＇s, a highland lake in southwestern China. Pollution of lead and zinc （Pb and Zn） was differentiated based on principal component analysis, geochemical normalization, and lead isotope ratios. Nearly all the metals as well as grain size composition show generally constant values before the mid-1980＇s, denoting stable detrital input in the catchment. Fluctuations in the concentrations of the metals as well as grain size composition since the mid-1980＇s indicate an increase in soil erosion with strengthened human disturbance in the catchment. After geochemical normalization, Pb and Zn showed constant values before 1990 AD and then a gradual increase in parallel with the variations in 2~spb/~~6pb and 2~7pb/2~6pb ratios, indicating that Pb and Zn pollution occurred. Combining the data of 20PPb/206Ppb and 207Pb/206Pb ratios in the sediments of Yangzong Lake, leaded gasoline, Pb-Zn ore and coal, and consumption or production historical trends, we deduced that the enhanced Pb and Zn pollution in Yangzong Lake is caused primarily by ore mining and refining.

关 键 词：Pb  Zn POLLUTION temporal trend SEDIMENT Yangzong Lake 

分 类 号：X503.1[环境科学与工程—环境工程] P532[天文地球—古生物学与地层学]