外度水库底泥重金属的分析及潜在生态风险评价

Analysis of Heavy Metals in Sediment of Waidu Reservoir and Its Potential Ecological Risk Assessment

对莆田市外度水库底泥中Fe、Mn、Cu、Zn、Ni、Cr、Pb、Cd、As的含量进行分析。采用潜在生态风险指数法,研究了底泥中重金属的污染水平及其生态危害。结果表明:莆田市Mn、Cu、Zn和Cd的含量高于福建省土壤重金属含量背景值。底泥中重金属的潜在生态风险评价显示:外度水库底泥中重金属具有轻微的生态风险。各种重金属的污染程度为:Cd>Cu>As>Ni>Zn>Pb>Mn>Cr>Fe。外度水库底泥的重金属潜在生态风险主要是由于底泥Cd的潜在生态风险系数过高所造成。在此基础上,对产生的原因进行了分析并提出了治理的建议。

The contents of Fe, Mn, Cu, Zn, Ni, Cr, Pb, Cd, As in the sediment of Waidu reservoir in Putian City were analyzed. The heavy metal pollution level and ecological risk of sediment were studied based on the method of potential ecological risk index. The results indicated that： the contents of Mn, Cu, Zn and Cd in sediments of Waidu reservoir were higher than that of the soil background values of Fujian Province. The assessment results of ecological risk revealed that the potential ecological risk of heavy metals in sediment of Waidu reservoir was slight. Heavy metal pollution degree was in the order of Cd〉Cu〉As〉Ni〉Zn〉Pb〉Mn〉Cr〉Fe. The potential ecological risk of heavy metals in sediment of Waidu reservoir mainly resulted from high potential ecological risk factor of Cd in sediment. Based on this, the cause of pollution was analyzed and then some treatment suggestions were proposed.