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Using Excess after Regression Analysis (ERA)Method to Evaluate Heavy MetalPollution in the Taizi River of Benxi City

JIA Zhenbang;YU Pengtao(Deparred of Geography,Peking University,Beijng,100871)  
The heavy metal pollution of Taizi River has been evaluated using Excess af- ter Regression Analysis method proposed by Hilton,The concentration of heavy metal within a sediment core has been modelled by considering three components,the back- ground concentration(C_b),that due to accelerated erosion(C_a),and an anthropogenic pollution term(C_p).Major cations associated with clay minerals such as Al,K and Mg do not have a pollution component.Iterative regression of the heavy metal concentration against one of these elements permits the isolation of C_p.Two group of heavy metals were identified.Type A(Zn and Cd )did not have a component due to accelerated ero- sion C_a,They are thought to have passed through a solution phase before being recruit- ed to the sediment.Type B metals(Fe,Ni,Cu and Pb)correlated well with the clay mineral elements and were probably transported to the sediment as particles。 We devel- oped the Ep A method because the heavy metal pollution level can、be identified by it。 As a result,the developed ERA method makes it easy to compare the heavy metal pollu- tion in different regions,After this study,we can draw the following conclusion:Cop- per and lead pollution are most serious in Taizi River;The heavy metal pollution is seri- ous in the middle section of Taizi River,especially in Hejingou section, But Niuxintai section has no heavy metal pollution and Baishi section has little。
【CateGory Index】: X522
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