沪宁高速公路两侧土壤和小麦重金属污染状况

以沪宁高速公路为研究对象,分路段采集公路两侧土壤及小麦样品进行重金属污染监测。结果表明,沪宁高速公路两侧距路肩250m范围内土壤和小麦已受不同程度铅污染。土壤中铅最大污染指数达3.26,铜、镍、铬、镉污染不显著。公路两侧小麦籽粒中铅含量超标率99%以上,最大超标倍数达1.73倍,锌有部分样品超标,镉及铜无超标现象。多数地段土壤铅含量在距路肩100m处较高,而小麦籽粒铅含量则多以距路肩50m和100m处较高。公路交通铅污染仍然是影响公路两侧农产品质量安全的重要因子之一。

Heavy metal pollution of the soils and wheat grains alongside the Shanghai-Nanjing Expressway

In order to study heavy metal pollution of the soils and wheat grains alongside the Shanghai-Nanjing Expressway,a survey was carried out with soil samples and wheat samples collected from different sections of the expressway.The results show that the soils within the 250 m wide zones along either side of the expressway and grains of the wheat growing thereupon were polluted with lead to a various extent.The maximum Pb contamination index reached 3.26 in the soil of Suzhou section of the expressway.The pollution of other heavy metals was not significant.According to the national standards for food,the content of Pb in the wheat grains exceeded the standard seriously,while the contents of other heavy metals were lower than the standards.The maximum content of Pb occurred in soils 100 m away from the expressway to either side.While,the maximum content of Pb in wheat grains appeared in places (50-100) m away.It could be concluded that Pb pollution on both sides of highways is still one of the major environmental problems affecting the safety of soil and agricultural products.