Ecological risk assessment and source analysis of soil-sediment heavy metals in the lower reaches of Jinling River in Baoji city
To study the sources of heavy metals in soil and sediment in the lower reaches of the Jinling River in Baoji,42 soil and 41 sediment samples were collected,the contents of eight heavy metals(Pb,Cd,As,Cr,Mn,Ni,Cu and Zn)in soil and sediment were determined by high precision X-ray fluorescence spectrometer,the spatial distribution characteristics of Pb,Cd,As,Cr,Mn,Ni,Cu,and Zn were analyzed,ecological risk of heavy metals were assessed by using single factor potential ecological risk index and comprehensive ecological risk index,and the pollution sources and contribution rates of heavy metals were identified by using PMF model.The results revealed that the mean order of heavy metal contents in soils was:Mn＞Zn＞Cr＞Pb＞Cu＞Ni＞As＞Cd,and the mean order of heavy metal contents in sediments was:Mn＞Zn＞Cr＞Ni＞Cu＞Pb＞As＞Cd.There are significant spatial differences in the distribution of heavy metals in the soil and sediment in lower reaches of the Jinling River,the areas with higher concentration of soil heavy metals are near Panlongshan village and Zhaijiapo village,while the areas with higher concentration of sediment heavy metals are around Yaojiazhai and the railway.Cd in the soil and sediment in this region is at a strong risk level.The average comprehensive ecological risk of soil heavy metals is mild,while the average comprehensive ecological risk of sediment heavy metals is moderate.Source apportionment showed that the main sources of soil heavy metals in the region are industrial source(36.85%),natural source(19.12%),agricultural source(23.42%)and traffic source(20.61%),the main sources of heavy metals in sediments are industrial source(48.32%),natural source(33.27%)and agricultural source(18.41%).
soilsedimentheavy metalsPMF modelJinling River downstream
万方数据
维普
