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Investigation and Assessment of Soil Heavy Metal Pollution of Main Productive Bases of Lichee and Longon in BaoAn District of Shenzhen City

Tang Shujun Li Xing Lai Yong Liu Shizhe  
Soil samples that were collected from 20 major lichee and longan production bases in Bao'An district,Shenzhen city were investigated for the assessment of heavy metals pollution of these soils by means of single pollution index method and comprehensive pollution index method based on 7 pollution indexes(Zn,Cu,Cr,Pb,Cd,As,Hg),respectively.The results showed that 19 of the 20 soil samples were not polluted,and only 1 soil samples had been polluted and the pollution rate was 5%.The environmental quality for grade 2 and grade 3 soils were mainly polluted by Hg.
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