陕蒙高速两旁粮食作物中重金属含量分析

为了研究陕蒙高速公路的开通对公路旁粮食作物生产带来的影响，笔者以陕蒙高速南段的王则湾为样区，采用原子吸收法对公路边水稻和玉米根、茎、叶的消解液中重金属（Zn、Pb、Cu、Cb）含量进行测定。结果表明公路对玉米和水稻中重金属元素积累有显著作用，与无公路影响的对照样进行比较，2个样区中2种粮食作物的重金属含量均超标，表明高速路旁100m范围内种植的粮食作物（特别是距路基40m范围）正受到重金属的污染，污染原因主要与高速公路的开通直接相关。据此，笔者认为，公路主干道100m范围内不适宜种植粮食作物。

Analysis of Heavy Metal Content in Food Crops Planted Along the Shaanxi Inner Mongolia Expressway

To understand the effect of the running of Shaanxi Inner Mongolia Expressway on food crops planted along the sides,we determined the heavy metal contents(Zn,Pb,Cu and Cb) in the digestion solutions of the root,stem and leaf from rice and corn.The results showed that highway promoted the accumulation of heavy metal elements in corn and rice.Compared with the CKs(crops produced where no highway extend),contents of heavy metal elements in two crops tested from two sampling sites were both over standard.This indicates that food crops planted within 100 m away from the highway are been polluted by heavy metals,which is directly related with the running of Shaanxi Inner Mongolia Expressway.Based on this,the areas within 100 m away from the highway are not suggested to cultivate food crops.