Distribution Characteristics and Ecological Risk Assessment of Heavy Metals in Surface Sediments from Zhejiang Offshore
This study explored the spatial distribution characteristics and ecological risk of heavy metals by analyzing the grain size of 477 surface sediment samples and the contents of six elements(Cu,Pb,Zn,Cr,Cd,As)and total organic carbon(TOC)in these samples from Zhejiang offshore.The results showed that the spatial distribution of heavy metals in surface sediments from the study area was similar,with high content near shore and low content far shore.The six elements had similar sources and were positively correlated with the mean grain size and TOC.Fine grained muddy sediments and TOC were the primary and secondary in-fluencing factors leading to enrichment and accumulation,respectively.The geoaccumulation index of the six ele-ments was relatively low,and heavy metal pollution was generally at a mild level.The potential ecological risk coefficients of the six elements were Cd,As,Pb,Cu,Cr,Zn in descending order,and their potential eco-logical risks were slight.Both geoaccumulation index and comprehensive potential ecological risk index showed that heavy metal pollution in onshore area was much heavier than that in offshore waters.
Heavy metalsDistribution characteristicEcological risk assessmentCorrelation analysisSurface sedimentsZhejiang offshore area
万方数据
维普
