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Scientific Articles - PTR-MS Bibliography

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Found 4 results
Title [ Year(Asc)]
Filters: Author is Kajos, MK  [Clear All Filters]
[Mogensen2011] Mogensen, D., S. Smolander, A. Sogachev, L. Zhou, V. Sinha, A. Guenther, J. Williams, T. Nieminen, MK. Kajos, J. Rinne, et al., "Modelling atmospheric OH-reactivity in a boreal forest ecosystem", Atmospheric Chemistry and Physics, vol. 11, no. 18: Copernicus GmbH, pp. 9709–9719, 2011.
[Sinha2010] Sinha, V., J. Williams, J. Lelieveld, TM. Ruuskanen, MK. Kajos, J. Patokoski, H. Hellen, H. Hakola, D. Mogensen, M. Boy, et al., "OH reactivity measurements within a boreal forest: evidence for unknown reactive emissions", Environmental science & technology, vol. 44, no. 17: ACS Publications, pp. 6614–6620, 2010.
Boreal forests emit large amounts of volatile organic compounds (VOCs) which react with the hydroxyl radical (OH) to influence regional ozone levels and form secondary organic aerosol. Using OH reactivity measurements within a boreal forest in Finland, we investigated the budget of reactive VOCs. OH reactivity was measured using the comparative reactivity method, whereas 30 individual VOCs were measured using proton transfer reaction mass spectrometry, thermal-desorption gas chromatography mass spectrometry, and liquid chromatography mass spectrometry, in August 2008. The measured OH reactivity ranged from below detection limit (3.5 s−1), to 60 s−1 in a single pollution event. The average OH reactivity was 9 s−1 and no diel variation was observed in the profiles. The measured OH sinks (30 species) accounted for only 50% of the total measured OH reactivity, implying unknown reactive VOCs within the forest. The five highest measured OH sinks were: monoterpenes (1 s−1), CO (0.7 s−1), isoprene (0.5 s−1), propanal and acetone (0.3 s−1), and methane (0.3 s−1). We suggest that models be constrained by direct OH reactivity measurements to accurately assess the impact of boreal forest emissions on regional atmospheric chemistry and climate.
[Ruuskanen2009] Ruuskanen, TM., R. Taipale, J. Rinne, MK. Kajos, H. Hakola, and M. Kulmala, "Quantitative long-term measurements of VOC concentrations by PTR-MS: annual cycle at a boreal forest site", Atmospheric Chemistry and Physics Discussions, vol. 9, no. 1: Copernicus GmbH, pp. 81–134, 2009.
[Taipale2008] Taipale, R., TM. Ruuskanen, J. Rinne, MK. Kajos, H. Hakola, T. Pohja, and M. Kulmala, "Technical Note: Quantitative long-term measurements of VOC concentrations by PTR-MS–measurement, calibration, and volume mixing ratio calculation methods", Atmospheric Chemistry and Physics, vol. 8, no. 22: Copernicus GmbH, pp. 6681–6698, 2008.
Proton transfer reaction mass spectrometry (PTR-MS) is a technique for online measurements of atmospheric concentrations, or volume mixing ratios, of volatile organic compounds (VOCs). This paper gives a detailed description of our measurement, calibration, and volume mixing ratio calculation methods, which have been designed for long-term stand-alone field measurements by PTR-MS. The PTR-MS instrument has to be calibrated regularly with a gas standard to ensure the accuracy needed in atmospheric VOC measurements. We introduce a novel method for determining an instrument specific relative transmission curve using information obtained from a calibration. This curve enables consistent mixing ratio calculation for VOCs not present in a calibration gas standard. Our method proved to be practical, systematic, and sensitive enough to capture changes in the transmission over time. We also propose a new approach to considering the abundance of H3O+H2O ions in mixing ratio calculation. The approach takes into account the difference in the transmission efficiencies for H3O+ and H3O+H2O ions. To illustrate the functionality of our measurement, calibration, and calculation methods, we present a one-month period of ambient mixing ratio data measured in a boreal forest ecosystem at the SMEAR II station in southern Finland. During the measurement period 27 March–26 April 2007, the hourly averages of the mixing ratios were 0.051–0.57 ppbv for formaldehyde, 0.19–3.1 ppbv for methanol, 0.038–0.39 ppbv for benzene, and 0.020–1.3 ppbv for monoterpenes. The detection limits for the hourly averages were 0.020, 0.060, 0.0036, and 0.0092 ppbv, respectively.

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Selected PTR-MS related Reviews

F. Biasioli, C. Yeretzian, F. Gasperi, T. D. Märk: PTR-MS monitoring of VOCs and BVOCs in food science and technology, Trends in Analytical Chemistry 30 (7) (2011).

J. de Gouw, C. Warneke, T. Karl, G. Eerdekens, C. van der Veen, R. Fall: Measurement of Volatile Organic Compounds in the Earth's Atmosphere using Proton-Transfer-Reaction Mass Spectrometry. Mass Spectrometry Reviews, 26 (2007), 223-257.

W. Lindinger, A. Hansel, A. Jordan: Proton-transfer-reaction mass spectrometry (PTR–MS): on-line monitoring of volatile organic compounds at pptv levels, Chem. Soc. Rev. 27 (1998), 347-375.


Lists with PTR-MS relevant publications of the University of Innsbruck can be found here: Atmospheric and indoor air chemistry, IMR, Environmental Physics and Nano-Bio-Physics


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