【摘要】 分析数据表明,苏州河市区段沉积底泥主要由细砂和淤泥组成.它所含有的重金属Cu,Cd,Ph,Zn的含量均大为超过上海市农业土壤背景值和JENSEN底泥污染评价值.Cu,Ph,Zn和Cd存在着明显地正相关关系,Zn和Cd比值变动在420—880. 试验结果表明,水相pH值对底泥中重金属的解吸溶出有显著影响,水相的温度和两相间的交换时间影响并不显著.重金属的交换溶山能力的排列顺序为Zn>Cd>Pb.由于底泥中含有的重金属的解吸溶出,导致上复水的水质恶化.更多还原

【Abstract】 With the aid of analysis data, the bottom sediments of urban district region of the Suzhou River in Shanghai were mainly consist of fine sand and silt. The contents of heavy metals such as Cu, Cd, Pb and Zn are more greatly than the background level of Shanghai agricultural soils, and JENSEN pollution evaluation value for sediments. Positive correlations evidently exist between Cu, Pb, Zn and Cd. The ratio of Zn and Cd is variable from 420 to 880.Test results show that the pH value of aquatic phase affects the release of heavy metals remarkably, while the temperature of aquatic phase and the time of bottom sediments exchange with overlying waters make little contribution to it. The order of release capability of heavy metals is Zn>Cd>Pb.As a result of the turbulance of mixing bottom sediments with overlying waters, certain heavy metals are released in significant amounts from bottom sediments, and changes in overlying water quality would be inferior.更多还原