佛山市5区菜地土壤的重金属含量特征

Status of Heavy Metals in Vegetable-soil Systems of Foshan City

[目的]研究佛山市菜地土壤的重金属含量特征。[方法]调查分析佛山市禅城、南海、顺德、三水和高明5个区的菜地土壤Cu、Pb、Zn和Cd4种重金属元素的全量和不同形态含量。[结果]佛山市5个区菜地土壤4种重金属Cu、Pb、Zn和Cd含量均超过国家和广东省背景值,其中以禅城、南海区最为严重。4种重金属元素中,Cd的污染指数最大,Cu次之;Cd的有效性系数最高。[结论]该研究可为指导佛山市蔬菜安全生产提供依据。

[Objective]The research aimed to study the status of heavy metals in vegetable-soil systems of Foshan City. [Method]The status of four heavy metals （Cd,Pb,Zn and Cu） in vegetable soils in Foshan City were investigated. [Result]The results showed that the concentration of each investigated heavy metal in the soils was greater than the mean level of the metal obtained based on either Guangdong Province wide and China wide soil survey. Among the whole city,the concentration of each investigated heavy metal in Nanhai County and Chancheng County were more serious than the other three counties. Of the four metals,Cd was the main contaminant,and Cu took second place. The coefficient of effectiveness to Cd was the highest. [Conclusion]The study can provide basis for ensuring the safe products of vegetables in Foshan City.