[1] Wong C S C, Wu S C, Duzgoren-Aydin N S, et al. Environmental Pollution， 2007， 145： 434.

[2] Cai Q, Long M L, Zhu M, et al. Environmental Pollution， 2009， 157: 3078.

[3] Yang Q W, Shu W S, Qiu J W, et al. Environment International, 2004, 30(7): 883.

[4] Voutsa D, Grimanis A, Samara C. Environmental Pollution, 1996, 94(3): 325.

[7] Nicholson F A, Smith S R, Alloway B J. Science of the Total Environment, 2003, 311(1/3): 205.