河床沉积物中铬、铜的释放研究(Ⅱ)

Study on Release of Cr and Cu in Sediment(Ⅱ)

以汾河太原段底泥为研究对象,选取两种具有代表性的重金属铬、铜,研究了钙对底泥中铬、铜的形态分布的影响;动态模拟流水情况下,底泥中铬、铜的升迁释放过程;模拟蓄水情况下,底泥中铜释放过程.结果表明,随着石灰投加量的增加,活性态以及形态3#,5#均有所减少,而形态4#,6#有所增加.在上覆水变清洁的情况下,底泥中的铬、铜有升迁释放倾向,但升迁速度都很慢.pH值和钙的浓度对铜的释放量有一定的影响.

Effect of Ca on forms distribution of Cr and Cu, up-transport release process of Cr and Cu in dynamic running-water circumstance, and release of Cu in impoundment circumstance , were studied in this paper. The results showed that the amount of Cr and Cu form 1~#,2~#,3~#,5~# increased, while form 4~#,6~# decreased with increase of Ca-loading. And there is an inclination of up-transport release of Cr and Cu when the covered water changes to clear, but the rate of release is very slow. The concentration of Ca and pH influence the release amount of Cu to some degree.