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OH clock determination by proton transfer reaction mass spectrometry at an environmental chamber

机译:在环境室中通过质子转移反应质谱法确定OH时钟

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The hydroxyl free radical (OH) is the major oxidizing species in thelower atmosphere. Measuring the OH concentration is generally difficult and involveselaborate, expensive, custom-made experimental setups. Thus other moreeconomical techniques, capable of determining OH concentrations at environmentalchambers, would be valuable. This work is based onan indirect method of OH concentration measurement, by monitoring an appropriate OHtracer by proton transfer reaction massspectrometry (PTR-MS). 3-pentanol, 3-pentanone and pinonaldehyde (PA) were usedas OH tracers in α-pinene (AP) secondary organic aerosol (SOA) aging studies. In addition we testedbutanol-d9 as a potential "universal" OH tracer and determined its reaction rate constant withOH: kbutanol-d9 = 3.4(±0.88) × 10−12 cm3 molecule−1 s−1.In order to make the chamberstudies more comparable among each other as well as to atmosphericmeasurements we suggest the use of a chemical (time) dimension: theOH clock, which corresponds to the integrated OH concentration overtime.
机译:羟基自由基(OH)是低层大气中的主要氧化物质。测量OH的浓度通常很困难,并且涉及复杂,昂贵的定制实验设置。因此,能够确定环境室中OH浓度的其他更经济的技术将很有价值。这项工作是基于间接的OH浓度测量方法,通过质子转移反应质谱(PTR-MS)监测合适的OH示踪剂。在α-pine烯(AP)二次有机气溶胶(SOA)老化研究中,将3-戊醇,3-戊酮和己醛(PA)用作OH示踪剂。此外,我们测试了丁醇-d9作为潜在的“通用” OH示踪剂,并确定了其与OH的反应速率常数: k 丁醇-d9 = 3.4(±0.88)×10 −12 cm 3 分子 −1 s −1 。为了使各个腔室之间的可比性更好关于大气测量,我们建议使用化学(时间)维度:OH时钟,它对应于累计OH浓度随时间的变化。

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