The bay is the area where the interaction between the sea and land and human activities is most intense,and the content and distribution of heavy metals in sediments are strongly affected by human activities.In order to determine the pollution level and possible sources of heavy metals in Qinzhou Bay sediments,this study analyzed the concentrations and spatial distributions of Cu,Pb,Zn,Cd,Cr,Hg and As,analyzed quantitatively the pollu-tion degree and ecological risk of heavy metals by geo-accumulation index(Igeo)and potential ecological risk index(PERI),and assessed quantitatively the possible sources of heavy metals by methods of self-organization mapping(SOM)and positive matrix factorization(PMF)model.Result showed that the average concentration of Zn was the highest and the average concentration of Hg was the lowest in the surface sediments of Qinzhou Bay.SOM and PMF modelling showed that heavy metals in surface sediments of Qinzhou Bay were mainly from natural sources,agricul-tural activities,industrial activities,and the relative contribution rates of the sources were 39.65%,29.15%and 31.20%,respectively.
关键词
海洋化学/表层沉积物/重金属/生态风险/PMF模型/来源/钦州湾
Key words
marine chemistry/surface sediments/heavy metal/ecological risk/PMF model/source/Qinzhou Bay
维普
万方数据