Development of a Method for Gaseous Hydrogen Peroxide Using Airborne Atmospheric Pressure Ionization Mass Spectrometry

气相过氧化氢是大气中奇氢氧化剂家族中的一个重要物种，特别是在控制重要的羟基自由基水平和在雾或云中引发二氧化硫的非均相水相氧化方面。这些化学反应对大气成分和地球系统气候产生了深远的影响。目前在微量大气水平上检测过氧化氢的现有方法存在时间响应相对较慢的问题。通过这一项目，研究人员将在实验室进一步开发和测试大气压力电离质谱仪技术，使大气中过氧化氢的数据速率和检测下限适合于在飞机上使用。这种新的快速反应测量能力将使过氧化氢测量与大气中奇数氢物种的其他现有快速反应测量技术更加一致，从而对各种重要的大气光化学循环产生新的见解。该项目的更广泛影响在于开发一种技术应用，以满足奇数氢测量界的迫切需求，其结果可能对未来的大气成分和气候变化研究产生重要影响。该项目还支持早期职业博士后研究人员的专业发展。

Gas phase hydrogen peroxide is an important species within the odd-hydrogen family of oxidants in the atmosphere, especially with regard to controlling important hydroxyl radical levels and initiating heterogeneous aqueous phase oxidation of sulfur dioxide in fog or cloud. These chemical reactions have profound effects on atmospheric composition and Earth system climate. Currently available methods for the detection of hydrogen peroxide at trace atmospheric levels suffer from relatively slow temporal response. Through this project the investigators will further develop and test the Atmospheric Pressure Ionization Mass Spectrometry technique in the laboratory to make measurements of atmospheric gas phase hydrogen peroxide at data rates and lower limit of detection amenable to use on aircraft. Such a new fast-response measurement capability would bring hydrogen peroxide measurements more into line with other available fast response measurement techniques for odd-hydrogen species in the atmosphere and in doing so generate new insights into a variety of important atmospheric photochemical cycles. The broader impact of this project lies in developing a technique application addressing a compelling need within the odd-hydrogen measurement community, with results likely to have an important impact on future atmospheric composition and climate change research. The project also supports the professional development of an early-career postdoctoral researcher.