京津冀大气中氯代和溴代多环芳烃的污染来源解析及生成机理研究

氯代和溴代多环芳烃（Cl/Br-PAHs）是一类新型持久性有机污染物，研究大气中Cl/Br-PAHs的来源和生成机理对其风险评估和防控有重要意义。本项目对京津冀地区大气中Cl/Br-PAHs的污染特征、来源和生成机理开展系统研究。采用高分辨质谱对大气中Cl/Br-PAHs进行准确定性和定量分析，阐明京津冀不同区域Cl/Br-PAHs的污染水平和同类物特征。采集潜在工业源烟道气样品并分析Cl/Br-PAHs，提出工业源Cl/Br-PAHs排放的指纹谱图。通过飞行时间质谱筛查大气中Cl/Br-PAHs的潜在前驱体，设计实验室模拟反应体系，研究前驱体在大气光化学作用下生成Cl/Br-PAHs的机理。根据不同工业源Cl/Br-PAHs排放的指纹谱图及光化学生成的同类物特征，解析京津冀地区Cl/Br-PAHs的多种污染来源，该项目对京津冀地区大气中Cl/Br-PAHs的风险评估和防控有重要意义。

Chlorinated and brominated polycyclic aromatic hydrocarbons (Cl/Br-PAHs) are emerging persistent organic pollutants (POPs). Clarifying their sources and formation mechanism is significant for evaluating their risk and guiding source control. In this project, the characteristics, source identification and formation mechanism of Cl/Br-PAHs in air from Beijing-Tianjin-Hebei region in North China will be systematically studied and clarified. High resolution mass spectrometry will be used for their accurate qualification and quantification of Cl/Br-PAHs congeners in the air samples from Beijing-Tianjin-Hebei region. Stack gas samples will be collected and analyzed for potential industrial sources with Cl/Br-PAHs fingerprints remains unknown. The fingerprints of Cl/Br-PAHs released from multiple potential industrial sources will be suggested and used for source identification. Potential precursors of Cl/Br-PAHs formations in the air will be screened by GC/Q-TOF technique. Laboratory simulation photochemical experiments using the identified precursors will be conducted to recognize the photochemical formation mechanism of Cl/Br-PAHs in air. The multiple sources of Cl/Br-PAHs in air from Beijing-Tianjin-Hebei region will be identified according to the specific fingerprints of Cl/Br-PAHs from industrial sources combining with their congener patterns by photochemical formations in air. This project will be of significance for better understanding the potential risks of Cl/Br-PAHs in air as well as their source control.