1. Alina KP, 1984 Trace Elements in Soils and Plants. CRC Press, Inc. Boca Raton, Florida, USA 14–19
2. Chen Q, Ru GC, 1989 Trace Elements and Health. Peking Beijing, China University Press 254–267 (in Chinese)
3. David P, Joanna B, 2003 Methodologies for assessing exposure to metals: speciation, bioavailability of metals, and ecological host factors Ecotoxicol Environ Saf 56:110–121
4. Guo GL, Zhou QX, 2004 Contaminative trends of heavy metals in Phaeozem of northeast China J Graduate School China Acad Sci 21(4):386–392 (in Chinese)
5. Hong X, 1987 Analytical Methods for Environmental Pollution Science Press, Beijing, China 487 (in Chinese)