Chemical characterization of oxygenated organic compounds in the gas phase and particle phase using iodide CIMS with FIGAERO in urban air
Chemical characterization of oxygenated organic compounds in the gas phase and particle phase using iodide CIMS with FIGAERO in urban air
复制标题
使用碘化物 CIMS 和 FigAERO 对城市空气中的气相和颗粒相含氧有机化合物进行化学表征
DOI：
10.5194/acp-21-8455-2021
复制
发表时间：
2021-06-03
影响因子：
6.3
通讯作者：
Shao, Min
中科院分区：
文献类型：
--
作者：
Ye, Chenshuo;Yuan, Bin;Shao, Min
抽象。污染环境下的大气过程涉及人为污染物和自然排放的相互作用，导致形成各种复杂的次级产物。因此，在城市地区的含氧有机化合物的表征仍然是一个关键问题，在我们的有机碳的演变的理解。在这里，我们描述了碘化学电离的测量
飞行时间质谱仪，安装有气体过滤器入口，
城市大气气溶胶（FIGAERO-I-CIMS）的气相和颗粒相
在广州，一个典型的大城市在中国南方，在秋季
在2018年。含有2至5个氧原子的大量含氧有机化合物
包括有机酸、多功能有机化合物
通常由生物质燃烧排放，生物质的氧化产物
烃和芳烃。光化学在光化学反应中起着主导作用。
形成气态有机酸和异戊二烯衍生的有机硝酸盐，
而夜间的化学物质对
单term衍生的有机硝酸盐和无机物。含氮
有机化合物占据了总信号的重要部分，
气相和颗粒相，在较高的温度下具有升高的分数，
分子量颗粒相中有机化合物的测量
通过FIGAERO-I-CIMS解释了总有机气溶胶的24 ± 0.8%
质量测量气溶胶质谱仪（AMS），并增加了分数
更古老的有机气溶胶。质量的系统解释
FIGAERO-I-CIMS在广州市区的光谱提供了一个
城市中众多含氧有机化合物的整体观
大气，可作为未来现场测量的参考
FIGAERO-I-CIMS在城市污染地区的应用。
Abstract. The atmospheric processes under polluted environments involving interactions of anthropogenic pollutants and natural emissions lead to the formation of various and complex secondary products. Therefore, the characterization of oxygenated organic compounds in urban areas remains a pivotal issue in our understanding of the evolution of organic carbon. Here, we describe measurements of an iodide chemical ionization
time-of-flight mass spectrometer installed with a Filter Inlet for Gases and
AEROsols (FIGAERO-I-CIMS) in both the gas phase and the particle phase at an urban
site in Guangzhou, a typical megacity in southern China, during the autumn
of 2018. Abundant oxygenated organic compounds containing two to five oxygen atoms
were observed, including organic acids, multi-functional organic compounds
typically emitted from biomass burning, oxidation products of biogenic
hydrocarbons and aromatics. Photochemistry played dominant roles in the
formation of gaseous organic acids and isoprene-derived organic nitrates,
while nighttime chemistry contributed significantly to the formation of
monoterpene-derived organic nitrates and inorganics. Nitrogen-containing
organic compounds occupied a significant fraction of the total signal in
both the gas and particle phases, with elevated fractions at higher
molecular weights. Measurements of organic compounds in the particle phase
by FIGAERO-I-CIMS explained 24 ± 0.8 % of the total organic aerosol
mass measured by aerosol mass spectrometer (AMS), and the fraction increased
for more aged organic aerosol. The systematical interpretation of mass
spectra of the FIGAERO-I-CIMS in the urban area of Guangzhou provides a
holistic view of numerous oxygenated organic compounds in the urban
atmosphere, which can serve as a reference for the future field measurements
by FIGAERO-I-CIMS in polluted urban regions.