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中文摘要：
对沱江流域金堂、简阳、内江三地河流沉积物中重金属Pb和Cd含量及其时空分布特征进行了研究,并结合与沉积物中Fe、Mn和LOI等参数的相关性对河流沉积物中Pb和Cd地球化学性质进行了初步的分析和讨论。结果表明,沱江三地沉积物中Cd、Pb含量不高,平均含量按上、中、下游次序逐渐降低;从垂向分布行为看,Cd在上游金堂地区上部含量高于下部,而中、下游两地则相反,而Pb均随着深度的增加而减少,反映了近年来人类活动所产生Pb污染的加剧;TOC、沉积物性状和上覆水体中的物化性质对于其垂向分布有着较大影响。对于深入揭示水环境中重金属的环境地球化学循环有着重要的指导意义。
英文摘要：
The geochemical properties of the trace elements of cadmium and lead in the three fluvial sediment cores from mud flat and sandy flat environment in the Tuojiang river were studied.The relativities among concentrations of Fe,Mn in porewaters and LOI in sediment were also investigated.The main results were shown as follow： ① the contents of total Cd and Pb were not very high in all the sediment cores,and the average content was in the order of upstream mid-stream downstream;② the profile of Cd was shown a trend of high at the surface and low at the bottom in upstream,while reversed pattern was found in the other two sites.As to Pb,the vertical profile in all three sites shows the concentration of Pb decreased with depth;③ the spatial change as well as the organic matter,sediment characteristics,and overlying water physicochemical properties are the remarkable factor for the vertical distribution of Cd and Pb in fluvial sediment.
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