Study on the Distribution and Source of Heavy Metal Pollution in Surface Sediments of Huanghua Habor

Abstract

In order to study the pollution characteristics of heavy metals in surface sediments of Huanghua Sea area, the concentrations of organic carbon, sulfide, petroleum, Hg, Cu, Pb, Zn, Cr, Cd and As in surface sediments of 15 stations in Huanghua Sea area were analyzed, and their sources and ecological risks were evaluated. The results show that all the elements in the sediments can meet the quality standard of a class of Marine sediments. The coefficient of variation of heavy metals ranged from 18.71% to 37.69%, indicating that the distribution of heavy metals among all stations was relatively uniform and the dispersion was small. The correlation of Pb, Cr and As in heavy metals is good, which indicates that these elements have homology. The results of ground accumulation index Igeo calculated by the average value of sediments in shallow sea of China show that Hg and Cd of surface sediments in Huanghua Sea are pollution-free to light-moderate pollution, and the pollution of Cd and Hg is more serious. The evaluation of potential ecological risk coefficient shows that the potential risk index RI of Huanghua Port area ranges from 112.78 to 449.89, all of which are greater than 110, belonging to moderate to strong ecological risk, in which the contribution values of Cd and Hg are greater than 90%, which also indicates that Cd and Hg are the main ecological risk factors in Huanghua Sea area.