Pollution Assessment and Source Analysis of Heavy Metals in the Surface Sediments of Xuwei Harbor District,Jiangsu Province
In order to scientifically assess the impact of the construction and development of Xuwei Harbor District on the surrounding ecological environment,the contents of 10 common heavy metals in the surface sediments of Xuwei Harbor District in Jiangsu Province were measured in September 2022,and the single-factor contamination index method,potential ecological risk in-dex method,geologic cumulative index method,correlation analysis,and principal component a-nalysis were used to evaluate the heavy metal contamination in the port area and analyze the sources.The study showed that the heavy metal contents in the sediments of the investigated are-a at all stations met the standards for marine sediments of the first category,and the single-factor contamination index method showed that some individual stations were moderately contaminated.The results of the comprehensive pollution index showed that 4 stations were slightly polluted and 5 sta-tions were moderately polluted.The potential ecological risk index showed that the potential ecological risk of heavy metals in sediments was Cd＞As＞Cu＞Ni＞Pb＞Co＞Zn＞V＞Cr＞Mn,the results of the comprehensive ecological risk index showed that only 1 station was seriously polluted.The geoaccumulation index method showed that the degree of contamination of heavy metals in sedi-ments was Cd＞As＞Zn＞Cu＞Ni＞Mn＞Co＞Pb＞V＞Cr,and the overall contamination situa-tion was relatively light.A significant correlation between Cr,V,Co,Pb,Ni and Cu,and there was no strong correlation between Cd and other heavy metal elements.PC1(V,Cr,Mn,Co,Ni,Cu,Pb)was mainly a mixed source of aquaculture,industrial production,shipping traffic and natural sources.PC2(Cd)was mainly industrial activities such as machinery manufacturing.PC3(As,Zn)was mainly from anthropogenic sources such as agricultural and domestic pollu-tion.Cd were potentially polluting heavy metals with high ecological risk index in Xuwei Harbor District,so the monitoring of related heavy metals in Xuwei Harbor District should be strength-ened to find out the main sources of heavy metal pollution and provide basic information for eco-logical environmental protection and management.
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