Li Xu-Jie, Shi Xiao-Wen, Ma Yan, Zheng Jun
School of Environmental Science and Engineering, Nanjing University of Information Science&Technology, Nanjing 210044, China.
Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing 210044, China.
Huan Jing Ke Xue. 2020 Feb 8;41(2):537-553. doi: 10.13227/j.hjkx.201908212.
PM samples were collected from December 2017 to November 2018 at a northern suburb site of Nanjing. The concentrations of five amines, major water-soluble ions, organic carbon, and elemental carbon were determined. The five amines measured were methylamine, ethylamine, dimethylamine, trimethylamine, and aniline. The annual average of the total amine concentration was (54.2±29.2) ng·m. Among these, dimethylamine was the most abundant[annual average:(20.2±13.7) ng·m], followed by methylamine[annual average:(13.1±6.3) ng·m], trimethylamine[annual average:(8.6±4.1) ng·m], ethylamine[annual average:(6.3±4.1) ng·m], and aniline[annual average:(5.9±3.9) ng·m]. The total amine concentration showed explicit seasonal variations:summer > autumn > spring > winter. The amine concentration on polluted days was higher than that on clean days. This may be influenced by aerosol acidity, promoting the partitioning of gaseous amine into the particulate phase. Aerosol acidity was also the major reason for the higher concentration of amine observed in summer than in other seasons. During new particle formation events, the concentrations of amines increased substantially. Positive matrix factorization (PMF) was utilized to identify the potential sources of amines, identifying six sources:industrial emission, agriculture emission, biomass burning, automobile emission, secondary formation, and dust. Methylamine and ethylamine mainly originated from secondary formation and automobile emissions. Dimethylamine and trimethylamine mainly originated from biomass burning, secondary formation, and automobile emissions; Aniline mainly originated from industrial emissions and biomass burning. A significant seasonal difference is observed with respect to the sources of amines. In spring and autumn, road dust sources account for a relatively high proportion. In summer, secondary sources are the main sources of amines. However, the diurnal variations of amine are not evident, and the secondary source, motor vehicle emission, and biomass combustion are the three main influencing factors.
2017年12月至2018年11月期间，在南京北郊的一个站点采集了颗粒物（PM）样本。测定了五种胺类、主要水溶性离子、有机碳和元素碳的浓度。所测定的五种胺类为甲胺、乙胺、二甲胺、三甲胺和苯胺。胺类总浓度的年平均值为（54.2±29.2）ng·m 。其中，二甲胺含量最高[年平均值：（20.2±13.7）ng·m ]，其次是甲胺[年平均值：（13.1±6.3）ng·m ]、三甲胺[年平均值：（8.6±4.1）ng·m ]、乙胺[年平均值：（6.3±4.1）ng·m ]和苯胺[年平均值：（5.9±3.9）ng·m ]。胺类总浓度呈现出明显的季节变化：夏季＞秋季＞春季＞冬季。污染日的胺类浓度高于清洁日。这可能受气溶胶酸度影响，促使气态胺向颗粒相分配。气溶胶酸度也是夏季胺类浓度高于其他季节的主要原因。在新粒子形成事件期间，胺类浓度大幅增加。利用正定矩阵因子分解法（PMF）识别胺类的潜在来源，确定了六个来源：工业排放、农业排放、生物质燃烧、汽车排放、二次形成和扬尘。甲胺和乙胺主要来源于二次形成和汽车排放。二甲胺和三甲胺主要来源于生物质燃烧、二次形成和汽车排放；苯胺主要来源于工业排放和生物质燃烧。胺类来源存在显著的季节差异。在春季和秋季，道路扬尘源占比较高。在夏季，二次源是胺类的主要来源。然而，胺类的日变化不明显，二次源、机动车排放和生物质燃烧是三个主要影响因素。
