The Heavy Metal Content in Vegetables and its Evaluation

The content of heavy metal,namely Cu,Zn,Pb and Cd in 3 kinds,24 species of vegetables including 243 samples,from Nanchang primary products markets was determined and analyzed.The results indicated that all of these vegetables had the four heavy metals and the contents of Cu and Zn were below the limit value of the food standard,while the contents of Pb and Cd in some samples exceeded the standard.In order to evaluate the effect of heavy metal content in vegetables on human health,we should consider not only the possibility of exceed samples but also the food safety of heavy metal to vegetables.The data process method of heavy metal in same sample by Nemero Index was much better than by arithmetic average value.It was mainly because the effect of the max heavy metal contents in the sample was emphasized by Nemero Index,and it accorded with the harm probability of heavy metal to vegetable quality.At the same time,the compound pollution index method used to evaluating contaminated soils was also suited to vegetables,because it can evaluate the whole effect of the four elements at the same time.According to the food security standard,people should eat more melon and fruit vegetables,and less foliage and rhizome vegetables.