Seasonal Differences in the Composition of Organic Aerosols in Beijing: a Study by Direct Infusion Ultrahigh Resolution Mass Spectrometry
Seasonal Differences in the Composition of Organic Aerosols in Beijing: a Study by Direct Infusion Ultrahigh Resolution Mass Spectrometry
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DOI：
10.5194/acp-2019-1009
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发表时间：
2020-01
影响因子：
6.3
通讯作者：
S. Steimer;Daniel J. Patton;T. Vu;Marios Panagi;P. Monks;R. Harrison;Z. Fleming;Zongbo Shi;M. Kalberer
中科院分区：
文献类型：
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作者：
S. Steimer;Daniel J. Patton;T. Vu;Marios Panagi;P. Monks;R. Harrison;Z. Fleming;Zongbo Shi;M. Kalberer
抽象的。这项研究调查了2016年冬季和2017年夏季在北京中心位置中国收集的PM2.5的化学成分。用直接进样负纳米电喷雾电离超高分辨率质谱仪对样品进行了表征，以阐明有机部分的组成和潜在的一次和二次来源。这两个季节的样本与英国伯明翰的公路隧道和城市背景场地的样本进行了比较，在早期的一项研究中使用了同样的方法进行了分析。不同季节的气溶胶颗粒组成有很大的差异，特别是(多)芳香族化合物，可能是由于化石燃料和生物质燃烧取暖的增加，在冬季显著增加。除了季节差异外，还观察到高污染和低污染条件下的组成差异，高污染条件下含硫有机物的贡献显著增强。含硫分子式的数量与颗粒硫酸盐的浓度之间存在相关性，这与颗粒相形成过程一致。
Abstract. This study investigates the chemical composition of PM2.5 collected at a central location in Beijing, China, during winter 2016 and summer 2017. The samples were characterised using direct infusion negative nano-electrospray ionisation ultrahigh resolution mass spectrometry to elucidate the composition and the potential primary and secondary sources of the organic fraction. The samples from the two seasons were compared with those from a road-tunnel site and an urban background site in Birmingham, UK, analysed in the course of an earlier study using the same method. There were strong differences in aerosol particle composition between the seasons, particularly regarding (poly-)aromatic compounds, which were strongly enhanced in winter, likely due to increased fossil fuel and biomass burning for heating. In addition to the seasonal differences, compositional differences between high and low pollution conditions were observed, with the contribution of sulfur-containing organic compounds strongly enhanced under high pollution conditions. There was a correlation of the number of sulphur-containing molecular formulae with the concentration of particulate sulfate, consistent with a particle-phase formation process.