广西防城港近岸表层沉积物重金属分布特征及污染评价

为了解防城港近岸海域表层沉积物重金属分布及污染特征,系统采集了19件研究区的表层沉积物样品,检测了7种重金属元素的含量.测试结果表明:研究区表层沉积物中Cu、Pb、Zn、Cd、Cr、Hg和As含量均符合政府制定的海洋功能区划要求.单因子潜在生态危害指数法评价结果显示,不同重金属潜在生态危害排序为Hg>Cu>Cd>As>...

Distribution characteristics and pollution assessment of heavy metals in coastal surface sediments of Fangchenggang in Guangxi

In order to investigate the distribution and pollution characteristics of heavy metals in surface sediments of Fangchenggang inshore,the authors in this paper systematically collected 19 surface sediment samples in the study area to test 7 heavy metal elements.The results show that the average contents of Cu,Pb,Zn,Cd,Cr,Hg and As in surface sediments are accordance with the requirements of marine functional zoning formulated by the government.The evaluation of single factor potential ecological risk index method indicates the potential ecological hazards of various heavy metals are Hg>Cu>Cd>As>Pb>Cr>Zn,which all belongs to low ecological risk except Hg.Low or medium potential risk is displayed by the potential risk index except station F17 and F19,and Hg was the main controlling factor for potential risk.The evaluation of geological accumulation index shows that there was slight pollution of Cu and Hg in the southern Qisha Peninsula,and the contents of these two ele-ments were between the threshold effect content and the possible effect content in some stations,meaning a certain probability of causing toxicity.Pb,Cr and As were mainly affected by terrigenous input sedimentation according to the correlation analysis and principal component analysis.While Cu and Zn were mainly from hull anti-corro-sion coatings and industrial sewage.The sources of Cd and Hg were relatively diversified,including both land-based rivers and electroplating,oil combustion,domestic or industrial sewage and mariculture.