Department of Environmental Science and Engineering, School of Geography and Tourism, Shaanxi Normal University, Xi'an, 710119, People's Republic of China.
International Joint Research Center of Shaanxi Province for Pollutant Exposure and Eco-environmental Health, Xi'an, 710062, People's Republic of China.
Arch Environ Contam Toxicol. 2018 Oct;75(3):351-366. doi: 10.1007/s00244-018-0522-1. Epub 2018 Mar 27.
Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous in the environment. This study collected a total of 62 urban soil samples from the typical semi-arid city of Xi'an in Northwest. They were analyzed for the composition, distribution, and sources of PAHs as well as the relationships with soil properties. The sum of 16 individual PAHs (∑16PAHs) ranged from 390.6 to 10,652.8 μg/kg with a mean of 2052.6 μg/kg. The average ∑16PAHs decreased in the order of the third ring road (2321.1 μg/kg) > the first ring road (1893.7 μg/kg) > the second ring road (1610.0 μg/kg), and in the order of industrial areas (3125.6 μg/kg) > traffic areas (2551.6 μg/kg) > educational areas (2414.4 μg/kg) > parks (1649.5 μg/kg) > mixed commercial and traffic areas (1332.8 μg/kg) > residential areas (1031.0 μg/kg). The most abundant PAHs in the urban soil were 3- to 5-ring PAHs. Elevated levels of PAHs were found in industrial and traffic areas from the east and west suburbs and the northwest corner of Xi'an as well as the northeast corner in the urban district of Xi'an. PAHs in the urban soil were mainly related to the combustion of fossil fuel (i.e., coal, gasoline, diesel, and natural gas) and biomass (i.e., grass and wood) (variance contribution 57.2%) as well as the emissions of petroleum and its products (variance contribution 29.9%). Soil texture and magnetic susceptibility were the main factors affecting the concentration of PAHs in urban soil. Meanwhile, this study suggested that the single, rapid, and nondeductive magnetic measurements can be an indicator of soil pollution by PAHs.
多环芳烃（PAHs）在环境中普遍存在。本研究共采集了来自西北典型半干旱城市西安的 62 个城市土壤样本，分析了 PAHs 的组成、分布和来源，以及与土壤性质的关系。16 种个体 PAHs 的总和（∑16PAHs）范围为 390.6 至 10652.8μg/kg，平均值为 2052.6μg/kg。∑16PAHs 的平均值按三环道路（2321.1μg/kg）>一环道路（1893.7μg/kg）>二环道路（1610.0μg/kg）的顺序递减，按工业区（3125.6μg/kg）>交通区（2551.6μg/kg）>教育区（2414.4μg/kg）>公园（1649.5μg/kg）>混合商业和交通区（1332.8μg/kg）>居民区（1031.0μg/kg）的顺序递减。城市土壤中最丰富的 PAHs 是 3-5 环 PAHs。在西安东郊、西郊、西北角和市区东北角的工业区和交通区发现了高水平的 PAHs。城市土壤中的 PAHs 主要与化石燃料（煤、汽油、柴油和天然气）和生物质（草和木）的燃烧（方差贡献 57.2%）以及石油及其产品的排放（方差贡献 29.9%）有关。土壤质地和磁化率是影响城市土壤中 PAHs 浓度的主要因素。同时，本研究表明，单一、快速、非推断性的磁测量可以作为 PAHs 土壤污染的指标。
