Distribution Characteristics of Heavy Metals and Its Evaluation in the Surface Sediment of Tielu Harbor

ZHU Zhixiong;CHEN Shiquan;XING Kongmin;CAI Zefu;LIN Guoyao;WU Zhongjie;Guangdong Province Vocational School of Oceanographic Engineering;Hainan Academy of Ocean and Fisheries Sciences;

ZHU Zhixiong%CHEN Shiquan%XING Kongmin%CAI Zefu%LIN Guoyao%WU Zhongjie%Guangdong Province Vocational School of Oceanographic Engineering%Hainan Academy of Ocean and Fisheries Sciences

Tielu Harbor;;Sediments;;Heavy metals;;Correlation;;Index of geo-accumulation;;Ecological risk assessment

The distribution characteristics,correlation and ecological risk of heavy metals in the surface sediments in Tielu Harbor were discussed and their contents were determined.Results showed that,the content ranges?of heavy metals,such as Cu,Pb,Zn,Cd,Cr,Hg and As,were10.83 to 45.90 mg/kg,5.94 to 23.86 mg/kg,6.91 to 78.41 mg/kg,0.05 to 0.82 mg/kg,8.0 to 19.6 mg/kg,0.021 to 0.07 mg/kg,1.68 to 16.77 mg/kg,respectively.Average value of Hg was smaller,while the value of Cd and As were bigger,when compared with those obtained in Haikou bay,Xiaohai,Xincun Lagoon,upper continental crust and shallow sea sediment in China.Correlation analysis showed that the pollution sources is same for Cu,Pb,Zn and Cr,and is same to Hg,Pb,Zn and Cd.It gives a priority to the moderate ecological risk,then the slight and strong ecological risk.Higher position of RI(Potential ecological harm coefficient of various heavy metals)is located in breeding concentrated areas of Tielu Harbor.Cd and Hg were the main potential ecological risk factors,and the descending order of heavy metals was Cd > Hg > As> Cu > Pb > Zn > Cr.These results can provide basic data and theoretical basis for environmental protection and sustainable exploitation of resources of Tielu Harbor.