六安市蔬菜地土壤重金属污染的初步研究

通过测定15份土样中的Cu、Zn、Pb、Ni、Mn含量,调查了安徽省六安市蔬菜地土壤重金属的污染状况,土壤中Cu、Zn、Pb、Ni、Mn的含量分别在8.15-32.45 mg·kg-1、20.1-95.15 mg·kg-1、45.75-61.6 mg·kg-1、39.1-73.1 mg·kg-1、91.45-275.25 mg·kg-1之间.以安徽省土壤背景值和国家土壤环境质量二级标准为评价标准,计算出各调查区土壤重金属污染指数.结果表明:以土壤背景值为标准评价,各调查区普遍受到了重金属的污染,综合因子评价已达中度污染,表现为复合污染,普遍受到Pb和Ni的污染,Pb的污染最严重;以国家土壤环境质量二级标准评价,其综合污染指数为1.43,是Ni引起的轻度污染.

STUDY ON THE HEAVY METALS POLLUTION IN THE VEGETABLE FARM SOILS IN LU'AN CITY

The paper discussed the pollution of heavy metals in vegetable farm soils in Lu'an City.The contents of copper,zinc,lead,nickel and manganese in 15 soil samples were measured.The results showed that the contents of copper,zinc,lead,nickel and manganese ranged from 8.15-32.45mg/kg,20.1-95.15mg/kg,47.75-61.6mg/kg,39.1-73.1mg/kg and 91.45-275.25mg/kg,respectively.At the same time,the pollution index was calculated based on both the background values of heavy metals in soils from Anhui province and the state standard values of soil quality in China.The result indicated that the vegetable farm soils were contaminated compoundly by lead and nickel in great universality based on the background values of heavy metals in soils from Anhui province.As for contaminated degree,lead was the most serious.Based on the state standard values of soil quality in China the average integrated pollution index of the city was 1.43 that indicated the result of vegetable farm soils having been slightly contaminated by nickel.