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

Author:

Barmet P.,Dommen J.,DeCarlo P. F.,Tritscher T.,Praplan A. P.,Platt S. M.,Prévôt A. S. H.,Donahue N. M.,Baltensperger U.

Abstract

Abstract. The hydroxyl free radical (OH) is the major oxidizing species in the lower atmosphere. Measuring the OH concentration is generally difficult and involves elaborate, expensive, custom-made experimental setups. Thus other more economical techniques, capable of determining OH concentrations at environmental chambers, would be valuable. This work is based on an indirect method of OH concentration measurement, by monitoring an appropriate OH tracer by proton transfer reaction mass spectrometry (PTR-MS). 3-pentanol, 3-pentanone and pinonaldehyde (PA) were used as OH tracers in α-pinene (AP) secondary organic aerosol (SOA) aging studies. In addition we tested butanol-d9 as potential "universal" OH tracer and determined its reaction rate constant with OH: kbutanol-d9 = 3.4(±0.88) · 10−12 cm3molecule−1s−1. In order to make the chamber studies more comparable among each other as well as to atmospheric measurements we suggest the use of a chemical (time) dimension:~the OH clock, which corresponds to the integrated OH concentration over time.

Publisher

Copernicus GmbH

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Introduction to Atmospheric Simulation Chambers and Their Applications;A Practical Guide to Atmospheric Simulation Chambers;2023

2. Volatility and hygroscopicity of aging secondary organic aerosol in a smog chamber;Atmospheric Chemistry and Physics;2011-11-18

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