天津市近岸海域表层沉积物环境质量评价

Environmental quality assessment in surface sediments from offshore marine area of Tianjin

"天津市多目标区域地球化学调查(近岸海域)"在天津市近岸海域采集了296件表层沉积物样品。在《海洋沉积物质量标准》(GB18668-2002)的基础上,并结合天津市近岸海域表层沉积物元素含量环境背景值,制定了天津市近岸海域沉积物环境质量评价标准(Ⅴ级),并对沉积物中砷(As)、镉(Cd)、铬(Cr)、铜(Cu)、汞(Hg)、铅(Pb)、锌(Zn)等7种痕量金属元素进行了环境质量评价。评价结果显示:天津市近岸海域表层沉积物环境质量总体良好,仅局部存在点状污染。

According to the multi-purpose geochemical survey,a total of 296 surface sediment samples were collected from offshore marine area of Tianjin.Based on the standard of 'Marine Sediment Quality'(GB18668-2002) and the background value of elements,evaluation standard(5 grades) was set for sediments of offshore marine area in Tianjin,and the environmental quality of trace metal elements(As,Cd,Cr,Cu,Hg,Pb,Zn,et al.) in surface sediments was evaluated.The result of assessment indicates that the environmental quality of the surface sediments in offshore marine area of Tianjin is generally fine,only pointpollution located in some marine area.