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)
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)
复制标题
DOI：
10.5194/amt-2019-406
复制
发表时间：
2019-11
影响因子：
3.8
通讯作者：
Marcel Weloe;T. Hoffmann
中科院分区：
文献类型：
--
作者：
Marcel Weloe;T. Hoffmann
抽象的。气溶胶质谱仪（AMS）经常应用于与气候、环境或健康相关的项目中的大气气溶胶研究。对于颗粒物的有机部分的测量也是如此，颗粒物仍然是造成大气气溶胶的成分中了解最少的一组。虽然对有机和/或无机气溶胶部分进行量化是可行的，但AMS测量通常不能提供关于单个有机化合物或化合物类别的更详细信息。在这项研究中，我们提出了一种新的方法来检测有机过氧化物在颗粒相实时使用AMS。过氧化物（ROOR '）由于其对SOA的潜在高质量贡献、其在新颗粒形成中的重要作用以及其在气溶胶健康相关主题中作为“活性氧物种”的功能而引起大气气溶胶社区的高度关注。为此，将过饱和气态三苯基膦（TPP）与感兴趣的气溶胶流在AMS入口前的冷凝/反应体积中连续混合。形成的三苯基氧化膦（TPPO）从过氧化物-TPP反应，然后检测气溶胶质谱仪（AMS），使半定量测定过氧化物的时间分辨率为2分钟。该方法进行了测试，新鲜形成和老化的生物源VOC和臭氧SOA，以及在一个简短的验证原理研究与环境气溶胶。
Abstract. 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.