上海滨岸带潮滩表层沉积物中重金属的空间分布与环境质量评价

Spatial distribution and Environmental quality assessment on heavy metals in tidal flat sediments of Shanghai coastal zone

1998年3月、7月、10月,在对上海潮滩进行连续采样和观测的基础上,用原子吸收法测试了70个沉积物中的Cu,Pb,Zn,Cd.Cr的含量。结果表明:(1)上海潮滩重金属含量有如下顺序:Zn>Cu>Cr>Pb>Cd。(2)从高潮滩到中低潮滩,重金属的含量递减。(3)不同的采样位置对重金属的含量有显著影响。(4)由于季节的变化,重金属元素的含量变化的幅度也很大,就现有三个季度数据对东海农场进行统计分析发现:季节变化对Cu的含量有显著影响,对Zn、Pb、Cr影响次之,而对Cd基本没有影响。(5)上海滨岸潮滩表层沉积物的重金属污染以Cu、Pb、Zn为主,高潮滩污染程度较重。

Based on the successive observation of Shanghai tidal flat,70 surface sediment samples were collected in March,July and October of 1998 respectively. The concentrations of Cu,Pb,Zn,Cd and Cr in sediments were analysed by atomic absorption spectrometry. The results show that heavy metals of Shanghai tidal flat were found in the following order :Zn>Cu>Cr>Pb>>Cd and heavy metals tended to be decreased form high tidal flat to middle-low tidal flat. The concentrations were varied with different sampling sites. Seasonal changes significantly influence concentrations of Cu while Cd was not been observed. Compared with sediment criteria,the heavy metals pollution mainly are Cu Pb and Zn.