Qi Huang, Min Xu, Yingying Zhu, Xin Li, Jiadong Xu, Xiaojian Li, Ying Lu
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引用次数: 0
摘要
本研究评估了新冠肺炎疫情防控期间，上海市机动车尾气排放对路边土壤中多环芳烃（PAHs）的影响。收集了路边草坪土壤样本，多环芳烃浓度范围为153至5639 ng g-1。与covid -19前相比，表层土壤样品中多环芳烃水平显著降低（Kruskal-Wallis H检验，p < 0.05），突出了交通和煤炭燃烧对城市污染的贡献。采用分子诊断比法和主成分分析法对上海市路边土壤中多环芳烃进行源鉴定，发现机动车尾气排放是主要污染源。土壤样品中苯并[a]芘浓度的毒性当量与这些来源有关。终生癌症风险增量模型表明，成人暴露于土壤中多环芳烃的健康风险大于10-6，但低于10-4，处于低风险水平。这些发现表明，在交通部门采取有针对性的措施可以改善城市土壤质量，减少相关的健康风险。
Vehicular mediated emissions of polycyclic aromatic hydrocarbons in roadside soils of Shanghai.
This study evaluates the impact of vehicular emissions on polycyclic aromatic hydrocarbons (PAHs) in roadside soils in Shanghai during the COVID-19 lockdown period. Soil samples from roadside lawns were collected, with PAH concentrations ranging from 153 to 5639 ng g-1. A significant reduction in PAH levels compared to their pre-COVID-19 levels (Kruskal-Wallis H test, p < 0.05) was observed in surface soil samples, highlighting the contribution of traffic and coal combustion to urban pollution. Source identification, using molecular diagnostic ratios and principal component analysis, revealed that vehicular emissions were the primary contributors to PAHs in Shanghai's roadside soils. The toxic equivalent quantity for benzo[a]pyrene concentrations in the soil samples was associated with these sources. The incremental lifetime cancer risk model indicated that adult exposure to PAHs in the soil posed health risks greater than 10-6 but lower than 10-4, suggesting a low-risk level. These findings suggest that targeted measures in the transportation sector could improve urban soil quality and reduce associated health risks.
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