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Investigation and Assessment on Heavy Metals in Soils and Vegetables in Sewage Irrigation Regions in Tianjin Suburbs

JIN Xing-long et al(School of Environmental Science and Safety Engineering,Tianjin University of Technology,Tianjin 300384)  
Tianjin located in the downstream of many rivers and is loaded with sewage from local,Beijing and other districts.The history of sewage irrigation is long and the sewage irrigation area is large,so great attention has been paid to heavy metal pollution in soils and vegetables in sewage irrigation region.Soils and vegetables of nine sampling sites were collected,and in which the concentrations of heavy metals were investigated.Heavy metal pollution of soils and vegetables were assessed with Nemerow index and single-factor index respectively.The results showed that the heavy metal pollution was very serious and the main pollution of soils came from Cd,their Nemerow index exceeded security limit,up to 22.01.The vegetables excluding leaf-vegetables suffered serious contamination from Pb、Cd、Se、As with higher rate of excess standard.Their single-factor index were higher than 3.00.Serious contamination from Se、As、Pb was also occurred in leaf-vegetables.Heavy metal pollution was prevalent and serious in sewage irrigation regions in Tianjin suburbs.The main reason of pollution was sewage irrigation,which should be controled and treated.The vegetables had different bioaccumulation abilities.Onion and garlic could be cultivated as alternative plants for soil bioremediation because they could easily concentrate heavy metals from soil irrigated by sewage.
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