Differences in the composition of organic aerosols between winter and summer in Beijing: a study by direct-infusion ultrahigh-resolution mass spectrometry
Differences in the composition of organic aerosols between winter and summer in Beijing: a study by direct-infusion ultrahigh-resolution mass spectrometry
复制标题
北京冬季和夏季有机气溶胶组成的差异：直接输注超高分辨率质谱分析
DOI：
10.5194/acp-20-13303-2020
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发表时间：
2020-11
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
中科院分区：
文献类型：
--
作者：
S. Steimer;Daniel J. Patton;T. Vu;Marios Panagi;P. Monks;R. Harrison;Z. Fleming;Zongbo Shi
抽象的。本研究调查了 2016 年冬季和 2017 年夏季在中国北京中心地点收集的 PM 2.5 的化学成分。使用直接注入负纳米电喷雾电离超高分辨率质谱法对样品进行了表征，以阐明有机部分的成分以及潜在的主要和次要来源。将这两个季节的样本与来自英国伯明翰公路隧道站点和城市背景站点的样本进行了比较，这些样本在早期研究过程中使用相同的方法进行了分析。季节之间的气溶胶颗粒成分存在很大差异，特别是（多）芳香族化合物，其在冬季大幅增强，可能是由于化石燃料和生物质燃烧供暖的增加。除了季节差异外，还观察到高污染条件和低污染条件之间的成分差异，其中含硫有机化合物的贡献在高污染条件下强烈增强。含硫分子式的数量与颗粒硫酸盐的浓度存在相关性，这与颗粒相形成过程一致。
Abstract. This study investigates the chemical composition of PM 2.5 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 sulfur-containing molecular formulae with the concentration of particulate sulfate, consistent with a particle-phase formation process.