南极菲尔德斯半岛六溴环十二烷在簇花松萝中的分布特征及其环境意义

Hexabromocyclododecanes (HBCDs) are emerging persistent organic pollutants (POPs), which are found widely existed in environment. HBCDs have bad effects on environment and biota. Also they could travel long distance to the Antarcitc by air, then deposit, and transfer into many matrix. Lichen has been reported as a good indicator to air pollution which could be a good supplement to active/passive air sampler in the Antarcitc. Therefore, this study will choose Usnea aurantiacoatra (Jacq.) Bory – dominant species of lichen at Fildes Peninsula, South Shetland Island, as indicator to monitor HBCDs in the ambient air. To Investigate distribution and correlation of HBCDs between two matrixes. Using different isomers (α,β,γ-HBCD) ratio to discover long-range transportation. Using 13C and 15N to trace the sources of the pollutants. With comparing the concentrations of HBCDs in two matrix, a mathematical model could be established to assess whether Usnea aurantiacoatra (Jacq.) Bory can be a bio-indicator to air pollution of HBCDs in the Antarctic. Based on all of the studies, we will summarize the distribution patterns of HBCDs in two matrix in the Antarctic and give better understand of new emerging POPs's behavior and long-range transportation to the Antarctic under the global climate change background.

六溴环十二烷（HBCDs）是新型持久性有机污染物（POPs），对环境和生物危害较大，被发现在环境中广泛存在，并可通过大气长距离迁移输送到南极，通过干湿沉降到南极各种介质表面，再进一步迁移转化。地衣作为大气中污染物指示生物的可行性已被验证和报道。南极自然条件恶劣，选择地衣指示南极大气HBCDs的污染能更简单、广泛、长期的监测南极大气中的污染物，是主被动式大气采样器的有效补充。HBCDs在南极簇花松萝中的分布情况与环境意义未见报道。本研究拟选取南极南舍得兰群岛中的菲尔德斯半岛上的优势种地衣-簇花松萝，作为指示生物来监测大气中α、β、γ-HBCD的含量水平，讨论二者浓度水平、分布特征和相关性，重点讨论不同异构体的比例，探索HBCDs长距离传输过程，并结合C、N同位素溯源，为全球气候变化下新型POPs在极地大气和地衣中的分布、迁移、长距离传输规律提供依据。

六溴环十二烷（HBCDs）是新型持久性有机污染物（POPs），对环境和生物危害较大，被发现在环境中广泛存在，并可通过大气长距离迁移输送到南极，通过干湿沉降到南极各种介质表面，再进一步迁移转化。地衣作为大气中污染物指示生物的可行性已被验证和报道。南极自然条件恶劣，选择地衣指示南极大气HBCDs的污染能更简单、广泛、长期的监测南极大气中的污染物，是主被动式大气采样器的有效补充。HBCDs在南极簇花松萝中的分布情况与环境意义未见报道。本研究采集了2016-2017两个自然年的气溶胶样品，以及两年的被动大气采样器样品，选取南极南舍得兰群岛中的菲尔德斯半岛上的优势种地衣-簇花松萝，作为指示生物来监测大气中α、β、γ-HBCD的含量水平，讨论二者浓度水平、分布特征和相关性，重点讨论不同异构体的比例，探索HBCDs长距离传输过程，为全球气候变化下新型POPs在极地大气和地衣中的分布、迁移、长距离传输规律提供依据。