酒泉市北大河沉积物重金属污染、来源及生态风险评估

Assessment of Contamination,Source Analysis and Ecological Risk for Heavy Metals in Beida River Sediments of Jiuquan City

文章采集河西地区典型的干旱区绿洲酒泉市肃州区的北大河表层沉积物,基于相关性分析、主成分分析、地累积指数和潜在生态风险指数,研究了沉积物中5种重金属(As、Cd、Cr、Pb和Hg)的污染特征、来源和生态风险。结果表明:各重金属浓度在嘉峪关与酒泉交界和银达泉湖交界较低,污水厂汇流区和鸳鸯池入口较高;Cd、Cr、Pb和Hg主要来源于部分工业生产和污水厂,As为自然来源;河道全域均不存在As和Cr的污染,但存在轻微的Cd、Hg和Pb污染,其中Cd和Hg具有较大的潜在生态风险,在河道污染防治过程中应注重Cd和Hg的控制。研究揭示了酒泉市北大河沉积物的重金属污染状况,主要的污染物类型及其来源,为河道沉积物治理提供了重点和方向。

In this paper,surface sediments of the Beida River in Suzhou District,Jiuquan,a typical arid zone oasis in the west of the river was collected,and the pollution characteristics,sources and ecological risks of five heavy metals(As,Cd,Cr,Pb and Hg)in the sediments based on correlation analysis,principal component analysis,geo-accumulation index and potential ecological risk index was studied.The results showed that the concentration of each heavy metal was lower at the junction of Jiayuguan and Jiuquan and the junction of Yinda and Quanhu,and higher at the confluence area of the wastewater plant and the entrance of Yuanyang Pond.Cd,Cr,Pb and Hg were mainly from some industrial production and WWTP,and As was a natural source.There was no As and Cr pollution in the whole area of the river,but there were slight Cd,Hg and Pb pollution,among which Cd and Hg had greater potential ecological risk,and the control of Cd and Hg should be paid attention to in the process of river pollution prevention and control.This study reveals the status of heavy metal pollution in the sediments of the Beida River in Jiuquan,the main types of pollutants and their sources,and provides a focus and direction for river sediment management.