关键词: 沉积物, 重金属, 污染, 太子河, 回归过量分析

Abstract: The heavy metal pollution of Taizi River has been evaluated using Excess after Regression Analysis method proposed by Hilton. The concentration of heavy metal within a sediment core has been modelled by considering three components, the background concentration(Cb), that due to accelerated erosion (Ca), and an anthropogenic pollution term (Cp). 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 isolationof Cp. Two group of heavy metals were identified. Type A(Zn and Cd)did not have a component due to accelerated erosion Ca. They are thought tohave passed through a solution phase before being recruited to the sediment. Type B metals (Fe, Ni, Cu and Pb)correlated well with the claymineral elements and were probably transported to the sediment as particles. We developed the ERA method because the heavy metal pollution level can't be identified by it. As a result, the developed ERA method makes it easy to compare the heavy metal pollution in different regions. After this study, we can draw the following conclusion: Copper and lead pollution are most serious in Taizi River; The heavy metal pollution is serious in the middle section of Taizi River, especially in Hejingou section. But Niuxintai section has no heavy metal pollution and Baishi section has little.

Key words: sediment, heavy metal, pollution, Taizi River, excess after regression analysis