二次有机气溶胶(SOA)是灰霾的主要成分，严重影响大气质量，危害公众健康。普遍认为，脂肪胺能参与并促进SOA的形成和生长，且产生的SOA会与大气矿物颗粒物形成混合态气溶胶。但是，目前的大气模型只考虑了脂肪胺通过大气均相反应形成的SOA，而没有考虑脂肪胺与矿物颗粒物的化学混合机制对SOA的贡献，导致SOA产率的估算值低于实际观测值。充分了解脂肪胺与大气矿物颗粒物的化学混合机制是准确估算其SOA产率的前提。因此，本项目将选择大气中浓度最高的典型脂肪胺为代表，采用理论计算方法，构建符合实际混合态气溶胶中组分分布特征的核壳模型，阐述脂肪胺壳层与矿物颗粒物的结合机制，揭示自由基介导下脂肪胺在矿物颗粒物表面的转化机制，明确光化学反应机理对化学混合机制的影响，评估化学混合机制对SOA的贡献。本项目将加深对脂肪胺在大气中转化机制的认识，使脂肪胺形成SOA产率被全面正确地评估。

Secondary organic aerosol is a dominant component of haze particle, which has severely negative impact on atmospheric environment and public health. It is well known that aliphatic amines can participate in the aerosol formation and facilitate the aerosol growth, and SOA yields generated from aliphatic amines can be mixed with mineral particles. At present, atmospheric models merely include SOA yields generated from homogeneous reaction of gaseous amines with radicals are accounted for the SOA yields estimations. However, the SOA contributions from chemical mixing mechanisms of aliphatic amines and atmospheric mineral particles are not considered in the atmospheric models, which are responsible for the lower estimated value than that of practically observed values of SOA yields. It is necessary to know well the chemical behaviors of aliphatic amines in the atmosphere in order to accurately evaluate amines contributions to SOA formations. Therefore, typical aliphatic amines, which are the richest amines in atmosphere, will be chosen as research objects in this project. A core-shell aerosol model consistent with real distributions of variable compounds in the mixing state aerosol will be constructed, in order to state the interacting mechanisms between aliphatic amines and atmospheric mineral particles, and reveal the formation mechanism of mixing state aerosol via different theoretical calculation methods. This project will be helpful to obtain better knowledge of aliphatic amine transformations in the atmospheric environment, and make comprehensive and accurate SOA yield estimations of aliphatic amines.