Study On The Relationship Of Heavy Metal Levels In Vegetables And In Soil

Objective:To analyse the contents and pollution of heavy metals of vegetables that were collected from the farmland of Suzhou industrial parks. According to analyse the 3 kinds of extractants,to decide the best method to extract the heavy metal of soil.Method:A survey was conducted to detect the contents of heavy metals on 12 kinds of vegetables and soil that were collected from the farmland of Suzhou industrial parks.According to the national standards, the system appraisal to its pollution degree was carried on.After hydrochloric acid, the feasibility of water and EDTA heavy metal such as Zn,Cd,Pb,Cu of 51 soil samples in suzhou industrial parks were determined by using AAS.After hydrochloric acid, the feasibility of water and EDTA heavy metal such as Zn,Cd,Pb,Cu of 12 kinds of vegetables and soil in suzhou industrial parks were determined by using AAS,and to analyse the relation of heavy metal after hydrochloric acid, the feasibility of water and EDTA between soil after hydrochloric acid,the feasibility of water and EDTA and vegetable.Results:The results show that most vegetables at Suzhou industrial parks were not polluted by the heavy metals in soil,but some polluted by Zn,Pb.The results show that the suitable extractant for available heavy metals was EDTA in the 3 kinds of extractants.The suitable extractant contents of Zn,Cu in soil by the 3 methods shows a significantly positive correlation. And Pb has not presented a correlation in the three methods.The content of Zn,Cu,Cd in soil shows a significantly positive correlation with the pollution of most vegetables. And the content of Pb pollution has not presented a correlation between the content of most vegetables and soil. The correlation of the heavy metals in soil after EDTA and vegetables is best.