摘要
武汉市墨水湖重金属污染严重,在我国内陆城市受污染湖泊中具代表性。应用ICP-MS对墨水湖上覆水和沉积物间隙水中的主要重金属元素进行了定量测试,并分析了其空间分布特征和变化规律。在此基础上,结合微量重金属界面扩散通量的计算,定量评估了其对上覆湖水水质的影响,以期为浅水湖泊的重金属污染防治提供科学依据。研究结果表明,墨水湖沉积物间隙水中重金属的浓度由高到低依次为:Mn>Fe>Zn>Cu>Cr>Pb;上覆水和沉积物间隙水中微量重金属浓度剖面均表现出明显相似的峰形分布特征,指示了湖泊沉积物中普遍存在微量重金属的沉积后再迁移现象;Fe和Mn在间隙水中的浓度远大于它们在上覆水中的浓度,其剖面分布特征主要是参与氧化还原反应的结果,Cu、Cr、Pb和Zn等的浓度也因受氧化还原过程及矿物平衡作用的影响而波动;微量重金属元素按照浓度梯度经孔隙水从沉积物向上覆水中扩散,并最终影响上覆水。
Moshui Lake is a representative of urban lakes heavily polluted by heavy metals in China.Study on distribution characteristics of heavy metals in the overlying water and pore water of the sediments of Moshui Lake was carried out.The change and transport patterns of major heavy metals were comprehensively discussed.According to the diffusion fluxes of heavy metals in the pore water of the sediments,the influence on the overlying water was qualitatively estimated.The results showed that the concentration of the following six heavy metals in Moshui Lake decreased in the order of Mn〉Fe〉Zn〉Cu〉Cr〉Pb.The concentration profiles of heavy metals in the overlying water and pore water of the sediments were in typical peak shapes indicating the widespread occurrence of remobilization of heavy metals after deposition.The concentrations of Fe and Mn in the pore water of the bottom sediments were much higher than those in the overlying water,and redox processes mainly controlled their distribution patterns.The concentrations of Cr,Cu,Pb and Zn in the pore water of the surface sediments fluctuated under the impact of redox processes and mineral equilibrium.The quality of the overlying water is influenced by the diffusion fluxes of heary metals in the pore water of the sediments.
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2008年第2期285-290,共6页
Resources and Environment in the Yangtze Basin
基金
国家杰出青年科学基金(40425001)
科技部政府间国际合作项目(2004DFB01600)
教育部生物地质与环境地质重点实验室开放基金(BGEG0615)
关键词
墨水湖
重金属
上覆水
沉积物间隙水
分布特征
Moshui Lake
heavy metals
overlying water
pore water of sediments
distribution
