Effect of Heavy Metal Content in Soil from Luoyang Vegetable Base on Vegetable Safety

Soil and vegetables from Luoyang vegetable base were used as the subjects to determine the contents of heavy metal ions such as Cr,Pb,Cd and Hg by atomic absorption spectrometry.The pollution status of soil and the quality of vegetables were evaluated by single factor pollution index and comprehensive pollution index.Results showed that the contents of Cr and Pb did not exceed the second-level limit of Standard of Soil Environment (GB 15618—1995).However,Luolong and Yichuan vegetables base were polluted by heavy metals according to the national vegetable food criteria.The key pollution factor was Pb with an exceeding rate of 36.3%.The highest content of lead was determined in leafy vegetables such as leaf lettuce.The lower pollution of lead was determined in root and stem vegetables,which was remained at the safe level.