[3] Luo Y M, Christie P. Extractability of Cu in alkaline biosolids-amended soils as influenced by γ-irradiation. Pedosphere, 2002,12(2):139-144
[4] Whitty L D. X-ray diffraction techniques for mineral identification and mineralogical composition//Black C A. Method of soil analysis. Wisconsin, USA: Soc. Agro., 1969: 671-698