The Investigation of Yunnan tin mining surrounding farmland soil and the analysis of six kinds of leafy vegetables heavy metal pollution

The investigation of the Yunnan tin mining surrounding (smelter around, mining under, mining) farmland soil and the analysis of the heavy metal pollution of six kinds of leafy vegetables. Meanwhile we have evaluated the potential ecological risks of soil metal pollution and the edible parts of leafy vegetables. The results show that: 1) Yunnan tin mining circumjacent study regional soil was heavy metal pollution. Through pollution degree grade: the farmland of smelter around >; the farmland of mining under >; the farmland of mining. 2) There is a great variation of six kinds of leafy vegetables that collected from different location. Heavy metal pollution soil makes the leafy vegetables heavy pollution. Lead and cadmium pollution particularly serious, chromium, copper and zinc less polluted. 3) the six kinds of leafy vegetables edible parts: Cd displays for strong ecological risks, Pb performance for medium to strong ecological risks, Cr, Cu and Zn performance for slight ecological risks. From a variety of heavy metal potential ecological harm index RI see, six species of leafy vegetables potential ecological risk index RI were greater than 600, regional six kinds of leafy vegetables potential ecological risk harm is very strong.