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首页> 外文期刊>International Journal of Environmental Research and Public Health >Relationships between Heavy Metal Concentrations in Roadside Topsoil and Distance to Road Edge Based on Field Observations in the Qinghai-Tibet Plateau, China
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Relationships between Heavy Metal Concentrations in Roadside Topsoil and Distance to Road Edge Based on Field Observations in the Qinghai-Tibet Plateau, China

机译：基于青藏高原实地观测的路旁表层土壤重金属含量与道路边缘距离的关系

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This study investigated the spatial distribution of copper (Cu), zinc (Zn), cadmium (Cd), lead (Pb), chromium (Cr), cobalt (Co), nickel (Ni) and arsenic (As) in roadside topsoil in the Qinghai-Tibet Plateau and evaluated the potential environmental risks of these roadside heavy metals due to traffic emissions. A total of 120 topsoil samples were collected along five road segments in the Qinghai-Tibet Plateau. The nonlinear regression method was used to formulize the relationship between the metal concentrations in roadside soils and roadside distance. The Hakanson potential ecological risk index method was applied to assess the degrees of heavy metal contaminations. The regression results showed that both of the heavy metals’ concentrations and their ecological risk indices decreased exponentially with the increase of roadside distance. The large R square values of the regression models indicate that the exponential regression method can suitably describe the relationship between heavy metal accumulation and roadside distance. For the entire study region, there was a moderate level of potential ecological risk within a 10 m roadside distance. However, Cd was the only prominent heavy metal which posed potential hazard to the local soil ecosystem. Overall, the rank of risk contribution to the local environments among the eight heavy metals was Cd > As > Ni > Pb > Cu > Co > Zn > Cr. Considering that Cd is a more hazardous heavy metal than other elements for public health, the local government should pay special attention to this traffic-related environmental issue.
机译：这项研究调查了路旁表层土壤中铜（Cu），锌（Zn），镉（Cd），铅（Pb），铬（Cr），钴（Co），镍（Ni）和砷（As）的空间分布。对青藏高原进行了评估，并评估了这些路边重金属由于交通排放而带来的潜在环境风险。在青藏高原的五个路段上共收集了120个表土样品。使用非线性回归方法来计算路旁土壤中金属浓度与路旁距离之间的关系。采用Hakanson潜在生态风险指数方法评估重金属污染程度。回归结果表明，随着路旁距离的增加，重金属的含量及其生态风险指数均呈指数下降。回归模型的大R平方值表明，指数回归方法可以适当地描述重金属累积与路边距离之间的关系。对于整个研究区域，在10 m的路边距离内存在中等程度的潜在生态风险。然而，镉是唯一对当地土壤生态系统构成潜在危害的重要重金属。总体而言，八种重金属对当地环境的风险贡献等级为Cd> As> Ni> Pb> Cu> Co> Zn> Cr。考虑到Cd是比其他公共健康元素更具危害性的重金属，地方政府应特别注意与交通有关的环境问题。

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