Analysis of the Change of Heavy Metal Contents in Farmland in Mengcheng

摘要

In order to find out the variations of soil heavy metal contents in Mengcheng, the heavy metal of the soil was tested in the same way in 2010, based on the survey results of 2001. The results showed that the contents of the 8 kinds of heavy metal in Mengcheng County were lower than those of the national standard, but the heavy metal content of Mengcheng County in 2010 were significantly higher than those in 2001, especially Pb, and the content of Hg, Ni, As also increased greatly; The increased of changing rate of various heavy metals contents are in the following descending order: Pb > Hg > Ni > As > Cu > Cd > Cr > Zn. The uneven dispersion of various heavy metals element in different sections of Mengcheng County also increased.