多溴联苯醚大气干湿沉降研究进展

Review article:Research progress of PBDEs in wet and dry atmospheric deposition

摘要:

干湿沉降是影响大气中持久性有机污染物(POPs)在大气中分布、迁移和转化的一个重要因素.一方面干湿沉降能够去除大气中多溴联苯醚(PBDEs)等POPs, 另一方面干湿沉降将大气中的POPs带到土壤、地表水体以及沉积物中, 成为土壤、地表水体以及沉积物中POPs的重要来源之一.本文总结国内外大气中PBDEs干湿沉降研究, 从降水中的PBDEs的组成特征、干湿沉降通量、湿沉降清除率以及干沉降速率等方面对PBDEs干湿沉降进行综述.首次利用化合物分配空间图(CPSM)对PBDEs在大气中干湿沉降归趋进行模拟, 并与报道中大气干湿沉降的结果进行对比, 结果表明, CPSM图可以很好地描述PBDEs在大气中干湿沉降归趋, 即BDE-47主要存在于大气气相中；BDE-209主要吸附于干、湿沉降颗粒相中.最后对PBDEs干湿沉降的研究进行总结与展望

Abstract:

Wet and dry depositions serve as important factors affecting the distributions, transport, and transfer of persistent organic pollutants (POPs) in atmosphere. On the one hand, wet and dry depositions can wipe out POPs, such as polybrominated diphenyl ethers (PBDEs) in the atmosphere, but on the other hand, these POPs become important source for contamination when they enter water, sediment, and soil. This paper summarized the worldwide study on dry and wet depositions of PBDEs in the atmosphere, including the composition of PBDEs in air and rain water, wet and dry deposition fluxes, scavenging ratio, and dry deposition velocity, etc. The wet and dry deposition patterns of PBDEs in the atmosphere were described for the first time using chemical partitioning space map (CPSM), and the comparison with the published data indicated that CPSM would properly describe the partitioning behavior for PBDEs-gaseous phase was major portion for BDE-47, and particulate phase the dominant for BDE-209 in both dry and wet depositions. A summary and future development on wet and dry deposition of PBDEs also have been provided