广西铁山港及其近岸海域不同海洋功能区重金属污染特征研究

Pollution characteristics of heavy metals in different marine functional areas of Tieshangang bay, Guangxi

本研究基于广西铁山港及其近岸海域海水中重金属的季节性调查数据,分析了重金属在不同海洋功能区的污染特征及潜在来源。结果显示,Cu、Pb、Zn、Cd、Cr、Hg和As的平均浓度分别为1.00μg/L、0.72μg/L、10.93μg/L、0.10μg/L、0.60μg/L、0.038μg/L和0.72μg/L。总体上,夏季重金属浓度高于冬季,并且夏、冬两季重金属浓度均呈现从海湾、近岸向离岸降低的趋势,这主要是受到陆源输入的影响。由于不同海洋功能区人类活动的差异,不同重金属在不同功能区的分布差异明显。受人类活动的影响,渔业区Cu和Pb的浓度明显高于其他区域。港口航运区较高浓度的Cd、Hg、Zn和As主要与陆源输入和船舶活动有关。然而,冬季偏远的离岸区较高的Zn和Cr浓度主要与水团输入有关。

Based on the seasonal survey results of heavy metal elements in the seawater of Tieshangang and its nearshore waters in Guangxi,this study explores the pollution characteristics and potential sources in different marine functional areas.The results showed that the average concentrations of Cu,Pb,Zn,Cd,Cr,Hg and As were 1.00µg/L,0.72µg/L,10.93µg/L,0.10µg/L,0.60µg/L,0.038µg/L and 0.72µg/L,respectively.Generally,the concentration of heavy metals is higher in summer than in winter,and the concentrations decrease seaward during both seasons,which mainly influenced by terrestrial inputs.Due to the differences in human activities in different marine functional areas,the distribution of different heavy metals in different functional areas varies significantly.Affected by the emissions from human activities,the concentrations of Cu and Pb in fishing areas are significantly higher than those in other areas.The high concentrations of Cd,Hg,Zn,and As in port transportation areas are mainly related to land-based inputs and ship activities.However,the higher concentrations of Zn and Cr in remote offshore areas during winter are mainly related to water mass input.