Abstract This paper reviews the data from studies mainly published after 2000 to provide the current understanding of the physicochemical properties, atmospheric occurrence, gas/particle partitioning, fate and temporal trends in atmospheric matrix of PCDD/Fs and dl-PCBs of East Asia. Ambient PCDD/Fs and dl-PCBs concentrations in East Asia are found to be tens to hundreds times higher than that measured in Europe and North America. After strict regulations on PCDD/Fs and dl-PCBs emissions are enacted, the concentrations of these compounds decrease dramatically in Eastern Asian countries. In general, most of PCDD/Fs distribute in particle phase while dl-PCBs majorly exist in gas phase. Three main factors including physicochemical properties of the compounds, properties of particle and atmospheric condition affect the gas/particle partitioning of PCDD/Fs and dl-PCBs. The accuracy of absorption and adsorption models on predicting gas/particle partitioning of PCDD/Fs and dl-PCBs is evaluated. Gas-phase compounds are mostly removed from the atmosphere via reactions with OH radicals while those in particle phase are majorly removed by wet/dry deposition processes. The effects of removing processes and long-range transport on gas/particle partitioning are also discussed.

中文翻译：

---

东亚大气中PCDD/Fs和dl-PCBs的发生与行为综述

摘要 本文回顾了 2000 年以后主要发表的研究数据，以提供目前对东亚 PCDD/Fs 和 dl-PCBs 大气基质的理化性质、大气发生、气体/颗粒分配、归宿和时间趋势的理解。发现东亚的环境 PCDD/Fs 和 dl-PCBs 浓度比欧洲和北美测量的浓度高几十到几百倍。在 PCDD/Fs 和 dl-PCBs 排放的严格规定颁布后，这些化合物的浓度在东亚国家急剧下降。一般来说，大部分 PCDD/Fs 以颗粒相分布，而 dl-PCBs 主要存在于气相中。三个主要因素，包括化合物的理化性质，粒子的特性和大气条件会影响 PCDD/Fs 和 dl-PCBs 的气体/粒子分配。评估了吸收和吸附模型在预测 PCDD/Fs 和 dl-PCBs 的气体/颗粒分配方面的准确性。气相化合物主要通过与 OH 自由基反应从大气中去除，而颗粒相化合物主要通过湿/干沉积工艺去除。还讨论了去除过程和远距离传输对气体/颗粒分配的影响。