大伙房水库表层沉积物重金属污染分析与评价

辽河流域大伙房水库是抚顺、沈阳两市重要的生活饮用水水源地,因其汇水区内的矿山开采活动而面临严重的重金属污染问题.为了解该区域的重金属污染状况,对大伙房水库表层沉积物中重金属Cr、Cu、Pb、Zn、Cd的含量及空间分布进行了研究,并采用地累积指数法、潜在生态危害指数法及基于多方的沉积物质量基准法对水库重金属污染程度及潜在...

Analysis and assessment of heavy metal pollution in surface sediments of the Dahuofang reservoir

Dahuofang reservoir of Liao river basin, which was the main drinking water source of Fushun and Shenyang city, was facing a serious problem of heavy metal pollution due to the mining in its catchment area. To explore the condition of heavy metal pollution, the content and spatial distribution of Cr, Cu, Pb, Zn and Cd in surface sediment was studied and the contamination and potential ecological risk of these elements was evaluated by three methods, i.e. geoaccumulation index, potential ecological risk index and consensus-based sediment quality guidelines. The results indicated that the average contents of Cr, Cu, Pb, Zn and Cd were 81.87, 65.20, 36.69, 137.49 and 2.38 mg.kg-1, respectively. Compared with the background value in Liaoning province soil, the average concentration in Liao river and nationwide sediment, all the 5 elements were enriched to some extent, especially Cd. The contamination of Cu, Pb, Cd and Zn was roughly in a downward trend from the tail to the head of the reservoir and significant positive correlations existed among these 4 elements. These results indicated that the upstream discharged industrial waste water of Hun river was the common pollution source. The comprehensive assessment results showed that Cd was the primary element of pollution with high ecological risk while Cu secondary and Zn, Pb and Cr slight.