六溴环十二烷(HBCD)作为一种新型持久性有机污染物，其所导致的环境污染和健康问题近年来受到了各国政府和科学家的广泛关注。针对目前HBCD对映体选择性环境行为方面研究的不足，本项目以珠江口红树林湿地为研究区域，研究手性HBCD在红树林湿地的污染现状及演变规律；结合磷脂脂肪酸技术(微生物分析)，研究HBCD对映体在红树林湿地沉积物中的选择性富集机制；研究手性HBCD在红树植物根/沉积物和根/水界面过程中的对映体选择性及在红树植物不同器官中的传输过程及机制；通过对HBCD降解产物的鉴定分析研究其在自然环境条件下的可降解性。本项目的完成，将增进对HBCD在红树林湿地中的来源、生物可利用性、选择性富集与降解等环境行为的认识，为正确评估手性污染物HBCD的生态风险提供科学依据。

The environmental pollution and human health of hexabromocyclododecane (HBCD) categorized as emerging persistent organic pollutants under the Stockholm Convention have attracted increasing attention from the international governments and scientists. Given inadequate studies on enantioselective environmental behavior of HBCD, the occurrence and evolution rule of chiral HBCD will be investigated in mangrove wetlands from the Pearl River Estuary (PRE) in this project. Using phospholipid fatty acid technique (microbial analysis), enantioselective accumulation mechanism of chiral HBCD in mangrove sediments of the PRE will be explored. Enantioselectivity of chiral HBCD in interfacial processes for mangrove plant root/sediment and mangrove plant/water, and transfer process and mechanism of HBCD in different organs of mangrove plant will be examined. Degradability of HBCD in natural environment will also be studied by analysis of degradation product of HBCD. Upon the completion of this project, it will be helpful for a better understanding of the source, bioavailability, enantioselective accumulation and biodegradation of HBCD in mangrove wetlands, and is expected to provide a scientific basis for the ecological risk assessment of HBCD.