羟基多溴联苯醚(OH-PBDEs)是一类具有环境风险的新兴污染物，广泛存在于地表水等多种环境介质中，OH-PBDEs的来源是当前环境领域的热点问题。光聚合是污染物在环境中普遍发生的光转化过程，也是有毒物质天然合成的途径之一。本项目拟以天然水体中存在的典型溴酚类物质(BPs)为模型化合物，结合稳态和瞬态技术，系统开展水体中BPs光致聚合成OH-PBDEs的光化学反应研究。通过实验模拟探讨BPs在水体中光聚合成OH-PBDEs的反应动力学及产物分布，研究分子结构-反应活性规律，同时，采用激光闪光光解-瞬态吸收光谱技术(LEP)，从分子水平研究该聚合反应路径及基元反应动力学，并结合EPR技术详细表征反应中产生的活性物种，从而揭示水体中BPs光转化成OH-PBDEs的反应机理及典型水环境因子对该转化的影响机制。本项研究对阐明天然水环境中OH-PBDEs的来源途径及其生态风险评价具有重要意义。

Hydroxylated polybrominated dyphenyl ethers (OH-PBDEs) are emerging environmental contaminants and have received significant attention due to their toxicities and ubiquitous distribution in biotic and abiotic environments. A basic question about OH-PBDEs pollution is where OH-PBDEs come from, as they have never been industrial-scale manufactured, and their sources and origins are not fully understood. The photopolymerization is the most class of photochemical process in environment, which also plays an important role in natural synthesis of persistant toxic substance (PTS). In this study, the photoformation of OH-PBDEs from bromophenols (BPs) in aqueous phase will be investigated by the combination of stable and transient technologies. The electron paramagnetic resonance (EPR) and laser flash photolysis(LFP)-transient absorption spectra techniques, together with GC-MS and HPLC-MS/MS, will be employed to study photo-induced polymerization reaction mechanism of BPs to OH-PBDEs. The photochemical experiment will be designed to study the photopolymerization rate constants of BPs, product distribution and their molecular structure-reaction activity relationship. Meanwhile, laser flash photolysis experiment will be used to study the property and kinetics characteristic of transient products. According to the assignment of transient species characterized by EPR and LFP, combined with the analysis of product distribution, the reaction mechanism of photopolymerization of BPs to OH-PBDEs in aqueous phase will be proposed, and the effects of important environmental factors (such as pH, NO2- and DOM) on the phototransformation will be elucidated. These findings will facilitate the thorough understanding of OH-PBDE congener sources and origins in abiotic environment and be helpful to their environmental risk evalution and management.