Analysis of heavy-metal contamination of vegetables in vegetable plot of Xi'an suburb

Three kinds of toxic heavy metals content in the soil from four different vegetable plots in Xi'an suburb and their corresponding vegetables are tested.The results show that: firstly,the east suburb soil reaches the soil environment requirements for pollution-free food,and in the soil from others,the Cd soil pollution is serious and the Pd,Cr soil pollution is terrible;secondly,in the 18 vegetable samples,27% reach moderate pollution,and 33% in heavy pollution,lastly,sewage irrigation is the main reason for the heavy metal pollution in the soil and their vegetables of Xi'an suburb.