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Application of time-of-flight aerosol mass spectrometry for the real-time measurement of particle-phase organic peroxides: an online redox derivatization–aerosol mass spectrometer (ORD-AMS)
Atmospheric Measurement Techniques ( IF 3.8 ) Pub Date : 2020-10-28 , DOI: 10.5194/amt-13-5725-2020
Marcel Weloe , Thorsten Hoffmann

Aerosol mass spectrometers (AMS) are frequently applied in atmospheric aerosol research in connection with climate, environmental or health-related projects. This is also true for the measurement of the organic fraction of particulate matter, still the least understood group of components contributing to atmospheric aerosols. While quantification of the organic and/or inorganic aerosol fractions is feasible, more detailed information about individual organic compounds or compound classes can usually not be provided by AMS measurements. In this study, we present a new method to detect organic peroxides in the particle phase in real-time using an AMS. Peroxides (ROOR') are of high interest to the atmospheric aerosol community due to their potentially high mass contribution to SOA, their important role in new particle formation and their function as “reactive oxygen species” in aerosol–health-related topics. To do so, supersaturated gaseous triphenylphosphine (TPP) was continuously mixed with the aerosol flow of interest in a condensation/reaction volume in front of the AMS inlet. The formed triphenylphosphine oxide (TPPO) from the peroxide–TPP reaction was then detected by an aerosol mass spectrometer (AMS), enabling the semiquantitative determination of peroxide with a time resolution of 2 min. The method was tested with freshly formed and aged biogenic VOC and ozone SOA as well as in a short proof-of-principle study with ambient aerosol.

中文翻译:

飞行时间气溶胶质谱仪在颗粒相有机过氧化物实时测量中的应用:在线氧化还原衍生化气溶胶质谱仪(ORD-AMS)

气溶胶质谱仪(AMS)通常用于与气候,环境或健康相关项目相关的大气气溶胶研究。对于颗粒物的有机部分的测量也是正确的,颗粒物仍然是最不被理解的构成大气气溶胶的组分组。虽然对有机和/或无机气溶胶组分进行定量是可行的,但通常无法通过AMS测量提供有关单个有机化合物或化合物类别的更详细的信息。在这项研究中,我们提出了一种使用AMS实时检测颗粒相中有机过氧化物的新方法。过氧化物(ROOR')对大气气溶胶界非常感兴趣,因为它们对SOA的潜在巨大贡献,它们在新颗粒形成中的重要作用,以及它们在与气雾剂有关的主题中作为“活性氧”的功能。为此,将过饱和气态三苯膦(TPP)与感兴趣的气溶胶流在AMS入口前方的冷凝/反应体积中连续混合。然后通过气溶胶质谱仪(AMS)检测从过氧化物–TPP反应形成的三苯膦氧化物(TPPO),从而可以半定量测定过氧化物,时间分辨率为2分钟。该方法已通过新近形成并老化的生物VOC和臭氧SOA进行了测试,并在短期的原理验证研究中使用了环境气溶胶进行了测试。将过饱和气态三苯膦(TPP)与感兴趣的气溶胶流在AMS入口前方的冷凝/反应体积中连续混合。然后通过气溶胶质谱仪(AMS)检测从过氧化物–TPP反应形成的三苯膦氧化物(TPPO),从而可以半定量测定过氧化物,时间分辨率为2分钟。该方法已通过新近形成并老化的生物VOC和臭氧SOA进行了测试,并在短期的原理验证研究中使用了环境气溶胶进行了测试。将过饱和气态三苯膦(TPP)与感兴趣的气溶胶流在AMS入口前方的冷凝/反应体积中连续混合。然后通过气溶胶质谱仪(AMS)检测从过氧化物–TPP反应形成的三苯膦氧化物(TPPO),从而可以半定量测定过氧化物,时间分辨率为2分钟。该方法已通过新近形成并老化的生物VOC和臭氧SOA进行了测试,并在短期的原理验证研究中使用了环境气溶胶进行了测试。
更新日期:2020-10-30
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