In this paper, the sequential extraction procedure was used for the selection of fractions of lead in seven stages corresponding to lead exchangeable, lead bounded to carbonates, to manganese oxides, to organic matters, to amorphous iron, and lead associated to crystallized iron, and to residuals. The vertical distributions of lead species were carried out in the soils related to good agriculture progress (GAP) of Chinese medical materials of Ligusticum chuanxiong Hort in Dujiangyan city and Wenchuan Co...
DENG Tian-long~(1,2),JIA Min-ru~2,LIAO Meng-xia~1 (1. College of Materials and Bioengineering, Chengdu University of Technology, Chengdu 610059, China
