Abstract：
The comprehensive understanding of PCBs\' fate has been impeded by the lack of simultaneous monitoring of PCBs in multiple environmental media in the background areas, which were considered long-term sinks for highly chlorinated PCBs. To address this gap, this study analyzed soils, willow tree barks, water, suspended particulate matter (SPM), and sediment samples collected from the middle reach of the Huaihe River in China for 27 PCBs. The results showed that the levels of ∑27PCBs in the soils were comparable to or lower than the background values worldwide. There were no significant correlations between organic matter and ∑27PCB concentrations in the soils and sediments. Additionally, the contamination of dioxin-like PCBs in the aquatic environment of the study area deserves more attention than in the soils. Applying the level III fugacity model to PCB 52, 77, 101, and 114 revealed that the soil was the primary reservoir, and air-soil exchange was the dominant intermedia transfer process, followed by air-water exchange. Furthermore, simulated results of air-soil and air-water diffusion were compared with those calculated from the field concentrations to predict the potential environmental behaviors of PCBs. Results indicated that the studied river would be a \"secondary source\" for PCB 52, 77, and 101. However, PCB 52, 77, 101, and 114 would continue to transfer from the air to the soil. This study combines multimedia field measurements and the fugacity model, providing a novel approach to predicting the potential environmental behaviors of PCBs.
摘要：
由于缺乏在背景地区同时监测多种环境介质中的多氯联苯，因此阻碍了对多氯联苯命运的全面了解，被认为是高氯化多氯联苯的长期汇。为了解决这个差距，这项研究分析了土壤，柳树的树皮，水,悬浮颗粒物(SPM)，从中国淮河中游收集的27个多氯联苯的沉积物样品。结果表明，土壤中∑27PCBs的含量与全球背景值相当或低于背景值。土壤和沉积物中有机质与∑27PCB浓度之间没有显着相关性。此外,研究区域水生环境中二恶英样多氯联苯的污染比土壤中的污染更值得关注。将III级逸度模型应用于PCB52、77、101和114，表明土壤是主要储层，空气-土壤交换是主要的中间转移过程，其次是空气-水交换。此外，将空气-土壤和空气-水扩散的模拟结果与根据田间浓度计算的结果进行比较，以预测多氯联苯的潜在环境行为。结果表明，所研究的河流将是PCB52、77和101的“次要来源”。然而,PCB52、77、101和114将继续从空气转移到土壤。本研究结合了多媒体现场测量和逸度模型，提供了一种新的方法来预测PCB的潜在环境行为。
