Chemical Speciation of Some Heavy Metals in Urban Soils in Changchun Studied by Chemical Extraction and Influencing Factors

GUO Ping, XIE Zhong-lei, KANG Chun-li, LI Jun，　GUO Peng，　LIU Jian-hua

Journal of Jilin University Science Edition . 2005, (01): 116 -120 .