State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Chemosphere. 2012 Jan;86(3):217-22. doi: 10.1016/j.chemosphere.2011.07.065. Epub 2011 Nov 25.
The effluents and sludge from municipal sewage treatment plants (MSTPs) are considered as potential sources of many contaminants to the ambient environments. In the present work, the air-water exchange of polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) was studied using passive air samplers at an urban lake, which receives the effluents from a MSTP in Beijing, China. The concentrations of PCBs and PBDEs in atmosphere were in the range 15.5-108 ng sample(-1) and 2.37-27.8 ng sample(-1), respectively, during the sampling period (August, 2007-July, 2008). The predominant PCBs and PBDEs were lowly halogenated congeners. The calculation for the exchange fluxes of PCBs and PBDEs using fugacity model showed that, the net exchange fluxes in different seasons were closely related to the halogen number of different congeners. Except for CBs-28 and 52, the net exchange fluxes was mainly directed from air to water for most of predominant congeners, which implied that the lower chlorinated CBs were dominated by volatilization process rather than the dry/wet depositions and diffusion between air-water interface, additionally, for heavy congeners, the dry/wet deposition process was an important source of PCBs and PBDEs in this lake.
城市污水处理厂（MSTP）的废水和污泥被认为是周围环境中许多污染物的潜在来源。在本工作中，使用被动空气采样器研究了中国北京一座城市湖泊中多氯联苯（PCBs）和多溴二苯醚（PBDEs）的气-水交换。在采样期间（2007 年 8 月至 2008 年 7 月），大气中 PCBs 和 PBDEs 的浓度范围分别为 15.5-108 ng 样本(-1)和 2.37-27.8 ng 样本(-1)。占主导地位的 PCBs 和 PBDEs 是低卤代同系物。使用逸度模型计算 PCBs 和 PBDEs 的交换通量表明，不同季节的净交换通量与不同同系物的卤原子数密切相关。除 CBs-28 和 52 外，对于大多数主要同系物，净交换通量主要是从空气到水的方向，这意味着低氯化 CBs 主要通过挥发过程而不是干湿沉降和空气-水界面之间的扩散来控制，此外，对于重同系物，干湿沉降过程是该湖泊中 PCBs 和 PBDEs 的重要来源。
