Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou, 510632, China.
Shenzhen Environmental Monitoring Center, Shenzhen, 518049, China.
Chemosphere. 2022 Mar;291(Pt 1):132716. doi: 10.1016/j.chemosphere.2021.132716. Epub 2021 Oct 27.
The soil-air partition coefficients (K) of polybrominated diphenyl ethers (PBDEs) and organophosphate flame retardants (OPFRs) is important for determining their fate in soil and air media. However, K values of OPFRs and PBDEs are not available from the current literature, and the effects of environmental factors such as temperature and relative humidity (RH) on K values are not clear. In this study, a solid-phase fugacity meter was used to measure the K values of PBDEs and OPFRs at different temperatures (25, 30, 35, 40, and 45 °C) and relative humidity (RH) conditions (<3 and 100% RH), the relationships between K and octanol-air partition coefficients (K) for OPFRs and PBDEs were analyzed. The results showed that an increase in temperature and RH resulted in a decrease of all K values for PBDEs and OPFRs. Furthermore, the effects of RH on the soil-air partitioning behavior of PBDEs were larger than that of OPFRs. In addition, a significant correlation (p < 0.0001) was observed between log K and log K. The experimental K values of OPFRs and PBDEs were quite different from the predicted K, when calculated with their K values. Overall, this study provides a better understanding for predicting the behavior and fate of OPFRs and PBDEs in soil-air systems.
土壤-空气分配系数（K）对于确定多溴二苯醚（PBDEs）和有机磷阻燃剂（OPFRs）在土壤和空气介质中的归宿非常重要。然而，目前文献中缺乏 OPFRs 和 PBDEs 的 K 值，且温度和相对湿度（RH）等环境因素对 K 值的影响也不清楚。在本研究中，采用固相逸度仪测定了不同温度（25、30、35、40 和 45°C）和相对湿度（RH）条件（<3 和 100% RH）下 PBDEs 和 OPFRs 的 K 值，并分析了 K 与 OPFRs 和 PBDEs 的辛醇-空气分配系数（K）之间的关系。结果表明，温度和 RH 的升高导致所有 PBDEs 和 OPFRs 的 K 值降低。此外，RH 对 PBDEs 土壤-空气分配行为的影响大于 OPFRs。此外，log K 与 log K 之间存在显著相关性（p<0.0001）。当用它们的 K 值计算时，OPFRs 和 PBDEs 的实验 K 值与预测 K 值有很大差异。总体而言，本研究为预测 OPFRs 和 PBDEs 在土壤-空气系统中的行为和归宿提供了更好的理解。
