College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China.
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China.
Int J Environ Res Public Health. 2020 Feb 21;17(4):1390. doi: 10.3390/ijerph17041390.
The Loess Plateau has one of the most vulnerable ecological environments in the world, but it also contains abundant oil and gas resources that are regularly exploited, which has resulted in serious environmental problems. Therefore, it is important to analyze the polycyclic aromatic hydrocarbons (PAHs) present in the topsoil of this region. The ∑16PAHs concentrations between 1980-1999 and 2000-2019 ranged from 1134.20-15871.04 and 1010.67-18,068.80 µg kg, with average values of 5021.30 and 5662.82 µg kg. All samples displayed heavy pollution levels according to European soil quality standards. In addition, among the measured physicochemical properties, the soil organic carbon (SOC) had the greatest influence on PAHs, while soil particle size distribution had the smallest effect. Source apportionment indicated that the two main sources were petroleum source (37.57%) and vehicular traffic source (25.88%). Lastly, an assessment of the carcinogenic risks illustrated that more focus should be placed on the dermal pathway in which the human body is exposed to soil PAHs. Overall, the carcinogenic risks in different populations did not exceed 10, but there was still a potential carcinogenic risk in some age groups, especially in adult women.
黄土高原是世界上生态环境最脆弱的地区之一，但它也蕴藏着丰富的油气资源，这些资源经常被开采，导致了严重的环境问题。因此，分析该地区表层土壤中的多环芳烃（PAHs）非常重要。1980-1999 年和 2000-2019 年∑16PAHs 浓度范围分别为 1134.20-15871.04 和 1010.67-18068.80 µg kg，平均值分别为 5021.30 和 5662.82 µg kg。根据欧洲土壤质量标准，所有样品均显示出严重的污染水平。此外，在所测量的物理化学性质中，土壤有机碳（SOC）对 PAHs 的影响最大，而土壤粒径分布的影响最小。源解析表明，两个主要来源是石油源（37.57%）和交通源（25.88%）。最后，对致癌风险的评估表明，应更加关注人体接触土壤 PAHs 的皮肤途径。总的来说，不同人群的致癌风险没有超过 10，但在某些年龄组，特别是成年女性中，仍然存在潜在的致癌风险。
