贵黄公路沿线重金属分布特征、来源解析及风险评价

本研究以贵州省的贵黄公路作为研究对象,分析道路两侧灰尘、土壤和植物样品中的重金属Cr、Cd、Cu、Zn和Pb的分布特征,判定其可能源,并且通过锌同位素进行初步验证.结果 表明,在道路两侧的灰尘和土壤中富集大量重金属,其中重金属锌富集能力最强,重金属元素绝大部份来自汽车的部件如轮胎、刹车片的磨损.使用地积累指数法和潜在生...

Distribution Characteristics, Source Apportionment and Risk Assessment of Heavy Metals along Guihuang Highway, Guizhou, China

In this study, we analyzed concentrations of heavy metal elements Cr, Cd, Cu, Zn and Pb in dust, soil and plant samples collected along the Guihuang Highway, in Guizhou province, China, with a goal to better identify the distribution characteristics and impact of highway emission on the surround environments. Zn isotope composition was also measured to confirm the contributing sources. Our results showed significant enrichments of heavy metals in dust and soils along the highway, and main sources of these heavy metals is the wear of tires and brake pads. Geoaccumulation index and potential ecological risk index methods were employed to evaluate the degree of heavy metal pollution and the risk level of environmental ecologic impact. Amongst these investigated heavy metals, Zn was the element with the highest enrichment. All metals Cr, Zn, Cu, Cd and Pb had certain risks and displayed harms to the environment, reaching medium or low risk level, while Cd would possess the highest threat to the environment.