Spatial and seasonal variations of PAHs in soil, air, and atmospheric bulk deposition along the plain to mountain transect in Hubei province, central China: Air-soil exchange and long-range atmospheric transport
Spatial and seasonal variations of PAHs in soil, air, and atmospheric bulk deposition along the plain to mountain transect in Hubei province, central China: Air-soil exchange and long-range atmospheric transport
复制标题
湖北省平原山地断面土壤、空气和大气沉降中多环芳烃的空间和季节变化：气土交换和远距离大气输送
DOI：
10.1016/j.envpol.2021.118139
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发表时间：
2021-09-13
影响因子：
8.9
通讯作者：
Xing, Xinli
中科院分区：
文献类型：
--
作者：
Hu, Tianpeng;Mao, Yao;Xing, Xinli
多环芳烃（PAHs）是人类社会长期面临的环境问题。非自愿性多环芳烃的来源复杂，而且由于全球变化和人类活动的干扰，环境中的固定多环芳烃会发生二次排放。采集土壤、空气和大气总沉降3种环境介质样品，观测其空间分布和季节变化，探讨多环芳烃的源汇及其与沿着平原-山区样带的大气质量输送的关系，探讨大气输送影响的地理范围。结果表明：16种多环芳烃普遍存在于所研究的各种环境介质中，且江滩地区大气、土壤和大气沉降通量中的多环芳烃浓度均高于“鄂西山区”。冬季、夏季、冬夏两季土壤、空气和大气沉积物中PAHs浓度均较高。多环芳烃的气-土逸度表明，大九湖土壤可能是一个汇。反向空气轨迹模拟证实，大部分的空气质量通过JHP到达DJH之前，结合（传输和持久性水平III）TaPL 3模式的结果JHP作为源。然而，季节变化导致土壤源和汇的作用发生变化。TaPL 3模型计算出，多环芳烃通过水迁移的影响范围更广，持续时间更长，甚至长达10年。
Polycyclic aromatic hydrocarbons (PAHs) are a long-term environmental problem faced by human society. The sources of involuntary PAHs are complex, moreover, secondary emissions of fixed PAHs in the environment occur due to global change and disturbance of human activities. Samples of three environmental media including soil, air, and atmospheric bulk deposition were collected to observe the spatial distribution and seasonal variation, to discuss the source or sink of PAHs and their association with the air mass transport along the plain (Jianghan Plain, JHP) to mountain transect, and explore the geographic scope of the atmospheric transport influence. The results obtained showed that 16 individual PAHs generally existed in all environmental multimedia being studied, and the PAHs concentration in air, soil and deposition flux of atmospheric bulk was higher in JPH than in "Western Hubei Mountains" (WHMs). Considerably high PAHs concentrations were obtained from the soil, air and atmospheric bulk deposition in winter, summer, and both summer and winter, respectively. The air-soil fugacity fraction of PAHs indicated that the soil of Dajiuhu (DJH) is likely to be a sink. Backward air trajectory simulation confirmed that most of the air mass passes over the JHP before reaching DJH, combined with the (transport and persistence level III) TaPL3 model results JHP are acting as sources. However, seasonal changes lead to a shift in the roles of soil sources and sinks. The TaPL3 model calculated that PAHs are transported through water for a wider range of effects and a longer persistence, even up to 10 years.