多粒径尺度多环芳烃气粒分配规律的研究

半挥发性有机物（SVOCs）在大气中以气态和颗粒态的形式共存，其气粒分配会直接影响该类物质在大气中的环境行为，还会间接影响其进入人体的途径和健康风险，所以SVOCs气粒分配的研究具有重要的科学意义和社会效应。基于大气中典型SVOCs—多环芳烃（PAHs）在总悬浮颗粒物和气态之间的气粒分配的研究基础和相关研究推测，PAHs的气粒分配在不同粒径之间可能具有差异性，然而多粒径尺度PAHs的气粒分配规律尚未阐明，因此，本项目通过对多粒径颗粒物和气态样品的同步采集和分析，系统研究多粒径尺度PAHs的气粒分配系数和气粒分配规律及影响因素，最终建立多粒径尺度PAHs气粒分配系数的预测公式和气粒分配理论。本项目的创新之处是更加侧重于将实际应用和理论研究相结合，项目的开展不仅能够实现多粒径尺度PAHs气粒分配系数的准确预测，也能够完善大气中PAHs的气粒分配理论。

Semi-volatile organic compounds (SVOCs) can exist both in gas phase and particle phase in atmosphere. The gas-particle partitioning of SVOCs can directly affect their environmental fate in atmosphere, and will also indirectly affect the pathway they get into human body and related health risk. Therefore, the study of the mechanism of gas-particle partitioning of SVOCs has important scientific significance and social effect. Based on previous research results and related studies on the gas-particle partitioning of polycyclic aromatic hydrocarbons (PAHs, one kind of typical SVOCs) between total suspended particulate and gas phase, the gas-particle partitioning of PAHs may be different among different particle sizes. However, the size-resolved gas-particle partitioning of PAHs has not been clarified. Therefore, based on the concurrent collection and analysis of multiple particle size particulate and gas phase samples, the size-resolved gas-particle partitioning coefficient, the size-resolved gas-particle partitioning mechanism and their influencing factors will be comprehensively studied. Finally, a prediction equation for the size-resolved gas-particle partitioning coefficient of PAHs and the size-resolved gas-particle partitioning theory of PAHs will be established. The combination of practical application and theoretical research is the major innovation of this project. In this project, not only the accurate prediction of the size-resolved gas-particle partitioning coefficient of PAHs will be obtained, but also the gas-particle partitioning theory of PAHs in atmosphere will be improved.