ptr-ms: Proton Transfer Reaction Mass Spectrometer

The Proton Transfer Reaction Mass Spectrometer (PTR-MS) measures gas-phase compounds in ambient air and headspace samples before using chemical ionization to produce positively charged molecules, which are detected with a time-of-flight (TOF) mass spectrometer. This ionization method uses a gentle proton transfer reaction method between the molecule of interest and protonated water, or hydronium ion (H3O+), to produce limited fragmentation of the parent molecule. The ions produced are primarily positively charged with the mass of the parent ion, plus an additional proton. Ion concentration is determined by adding the number of ions counted at the molecular ion’s mass-to-charge ratio to the number of air molecules in the reaction chamber, which can be identified according to the pressure levels in the reaction chamber. The PTR-MS allows many volatile organic compounds in ambient air to be detected at levels from 10–100 parts per trillion by volume (pptv). The response time is 1 to 10 seconds.

Measurements

Related Publications

2018

de Sá S, B Palm, P Campuzano-Jost, D Day, W Hu, G Isaacman-VanWertz, L Yee, J Brito, S Carbone, I Ribeiro, G Cirino, Y Liu, R Thalman, A Sedlacek, A Funk, C Schumacher, J Shilling, J Schneider, P Artaxo, A Goldstein, R Souza, J Wang, K McKinney, H Barbosa, M Alexander, J Jimenez, and S Martin. 2018. "Urban influence on the concentration and composition of submicron particulate matter in central Amazonia." Atmospheric Chemistry and Physics, 18(16), 10.5194/acp-18-12185-2018.

Shilling J, M Pekour, E Fortner, P Artaxo, S de Sá, J Hubbe, K Longo, L Machado, S Martin, S Springston, J Tomlinson, and J Wang. 2018. "Aircraft observations of the chemical composition and aging of aerosol in the Manaus urban plume during GoAmazon 2014/5." Atmospheric Chemistry and Physics, 18(14), 10.5194/acp-18-10773-2018.

Wei D, J Fuentes, T Gerken, M Chamecki, A Trowbridge, P Stoy, G Katul, G Fisch, O Acevedo, A Manzi, C Von Randow, and R dos Santos. 2018. "Environmental and biological controls on seasonal patterns of isoprene above a rain forest in central Amazonia." Agricultural and Forest Meteorology, 256-257, 10.1016/j.agrformet.2018.03.024.

PZ, M Alvarado, C Chiu, S DeSzoeke, C Fairall, G Feingold, A Freedman, S Ghan, J Haywood, P Kollias, E Lewis, G McFarquhar, A McComiskey, D Mechem, T Onasch, J Redemann, D Romps, D Turner, H Wang, R Wood, S Yuter, and P Zhu. 2018. Layered Atlantic Smoke Interactions with Clouds (LASIC) Field Campaign Report. Ed. by Robert Stafford, ARM Climate Research Facility. DOE/SC-ARM-18-018.

Liu Y, R Seco, S Kim, A Guenther, A Goldstein, F Keutsch, S Springston, T Watson, P Artaxo, R Souza, K McKinney, and S Martin. 2018. "Isoprene photo-oxidation products quantify the effect of pollution on hydroxyl radicals over Amazonia." Science Advances, 4(4), eaar2547, 10.1126/sciadv.aar2547.

Koss A, K Sekimoto, J Gilman, V Selimovic, M Coggon, K Zarzana, B Yuan, B Lerner, S Brown, J Jimenez, J Krechmer, J Roberts, C Warneke, R Yokelson, and J de Gouw. 2018. "Non-methane organic gas emissions from biomass burning: identification, quantification, and emission factors from PTR-ToF during the FIREX 2016 laboratory experiment." Atmospheric Chemistry and Physics, 18(5), 10.5194/acp-18-3299-2018.

Palm B, S de Sá, D Day, P Campuzano-Jost, W Hu, R Seco, S Sjostedt, J Park, A Guenther, S Kim, J Brito, F Wurm, P Artaxo, R Thalman, J Wang, L Yee, R Wernis, G Isaacman-VanWertz, A Goldstein, Y Liu, S Springston, R Souza, M Newburn, M Alexander, S Martin, and J Jimenez. 2018. "Secondary organic aerosol formation from ambient air in an oxidation flow reactor in central Amazonia." Atmospheric Chemistry and Physics, 18(1), doi:10.5194/acp-18-467-2018.
Research Highlight

2017

Zaveri R, J Shilling, A Zelenyuk, J Liu, D Bell, E D'Ambro, C Gaston, J Thornton, A Laskin, P Lin, J Wilson, R Easter, J Wang, A Bertram, S Martin, J Seinfeld, and D Worsnop. 2017. "Growth kinetics and size distribution dynamics of viscous secondary organic aerosol." Environmental Science & Technology, 52(3), 10.1021/acs.est.7b04623.
Research Highlight

2016

Fuentes J, M Chamecki, R Nascimento dos Santos, C Von Randow, P Stoy, G Katul, D Fitzjarrald, A Manzi, T Gerken, A Trowbridge, L Souza Freire, J Ruiz-Plancarte, J Furtunato Maia, J Tóta, N Dias, G Fisch, C Schumacher, O Acevedo, J Rezende Mercer, and A Yañez-Serrano. 2016. "Linking meteorology, turbulence, and air chemistry in the Amazon rain forest." Bulletin of the American Meteorological Society, 97(12), 10.1175/BAMS-D-15-00152.1.

Thompson S, R Yatavelli, H Stark, J Kimmel, J Krechmer, D Day, W Hu, G Isaacman-VanWertz, L Yee, A Goldstein, M Khan, R Holzinger, N Kreisberg, F Lopez-Hilfiker, C Mohr, J Thornton, J Jayne, M Canagaratna, D Worsnop, and J Jimenez. 2016. "Field intercomparison of the gas/particle partitioning of oxygenated organics during the Southern Oxidant and Aerosol Study (SOAS) in 2013." Aerosol Science and Technology, 51(1), 10.1080/02786826.2016.1254719.


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