9FALAHI A A. Contamination of environment with heavy metals emitted from automotives[J]. Ecotoxieology and Environmental Safety, 1984(8) : 152-161.
10DAVIDSON C M, THOMAS R P, MCVEY S E, et al. Evaluation of a sequential extraction procedure for the speciation of heavy metals in sediments[J]. Analytica Chemica Acta , 1994,291: 277-286.