Contents of Heavy Metals in Greenhouse Soil Around Wuhan Suburb and Their Potential Ecological Risk

The contents of five heavy metals(As,Hg,Cr,Cd,Pb) in greenhouse soils of Wuhan,China were investigated to provide basic information for controlling heavy metal pollution in greenhouse soil.The Hakanson ecological risk index was applied to assess the potential ecological risk of the heavy metal pollution.The results showed that the concentrations of As,Hg,Cr,Cd,Pb in the studied areas were 1.07,0.15,5.44,0.06,19.85 mg/kg,respectively,and Cd and Hg were 9.41 and 2.36 times,respectively higher than the basic background values of Hubei Province.The individual pollution factor of each heavy metal in the studied soils followed the order of Cd Hg Cr Pb As.Cd was the most potential ecological risk factor in the investigated areas.Based on the result of comprehensive potential ecological risk assessment,there were only 18.23% of the studied areas reached the moderate level,all other areas,however,were lower than mild level.Fig 4,Tab 3,Ref 15