35. 尚爱安,刘玉荣,梁重山.土壤中重金属的生物有效性研究进展[J]. 土壤,2000,32(6): 294-300.
36. García-Delgado M, Rodríguez-Cruz M S, Lorenzo LF, et al. Seasonal and time variability of heavy metal content and of its chemical form s in sew age sludges from different wastewater treatment plants [J]. Sci Total Environ,2007,382(1): 82-92.