【摘要】 为了解沱江流域成都段表层沉积物中重金属危害风险，在流域内采集32个表层沉积物，测定重金属As、Cd、Cr、Cu、Pb、Hg含量，利用主成分分析、地累积指数、潜在生态风险指数等方法进行分析。结果表明，6种重金属平均浓度从大到小为：Cr>Cu>Pb>As>Cd>Hg;总量呈西部上游支流相对较高，东部干流及支流相对较低；地累积指数法评价结果显示，仅存在Cd为轻度污染；潜在生态风险指数法评价结果显示，Cd为中风险，其余5种重金属为低风险，流域综合风险RI等级为低风险；相关性和主成分分析显示Cu、Cd、Cr、As、Pb可能主要源于农业和交通的复合污染，Hg可能主要源于工业污染。更多还原

【Abstract】 In order to understand the hazard risk of heavy metals in surface sediments of the Chengdu section of the Tuojiang River Basin, 32 surface sediments were collected in the basin. Heavy metals of As, Cd, Cr, Cu, Pb and Hg were analyzed by principal component analysis, geoaccumulation index and potential ecological risk index. The results showed that the average concentrations of the six heavy metals were as follows: Cr>Cu>Pb>As>Cd>Hg. The total volume was higher in the western upstream tributaries and lower in the eastern main stream and tributaries. The evaluation results of earth accumulation index method show that only Cd exists as light pollution. The evaluation results of potential ecological risk index showed that Cd was medium risk. The other 5 heavy metals were low risk, and the comprehensive risk RI grade of the basin was low risk. Correlation and principal component analysis showed that Cu, Cd, Cr, As and Pb may be mainly from the combined pollution of agriculture and traffic, and Hg may be mainly from industrial pollution.更多还原