Journal
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
Volume 430, Issue -, Pages 87-97Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijms.2018.05.003
Keywords
PTR-ToF-MS; Product ion distribution; Monoterpene; Sesquiterpene; Humidity-dependence; BVOC
Funding
- European Research Council (ERC) [335478]
- Academy of Finland Center of Excellence programme [307331]
- University of Eastern Finland Doctoral Program in Environmental Physics, Health and Biology
- European Research Council (ERC) [335478] Funding Source: European Research Council (ERC)
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Quantitative proton-transfer-reaction mass spectrometer (PTR-MS) measurements of ambient volatile organic compounds (VOCs) require proper calibration procedures. In particular, compound product ion distribution and humidity-dependent responses must be characterized. In this study, we generated twelve gas-phase terpenoid standards using a dynamic dilution system to calibrate the PTR-MS with time of-flight mass spectrometer (PTR-ToF-MS): six monoterpenes, two monoterpene derivatives, and four sesquiterpenes. The humidity-dependent response was characterized for three terpenoid compounds to compare different molecular structures: alpha-pinene, delta-limonene, and longifolene. We provide the first comprehensive summary of PTR-ToF-MS product ion distributions for twelve common biogenic volatile organic compounds using two different reduced electric field (E/N) values, 80 Td and 130 Td. Results demonstrated that neglecting to correct for individual product ion distributions of different terpenoid isomers can result in an error of up to 26% for reported mixing ratios. delta-Limonene and longifolene exhibited a small humidity-dependent response in the PTR-ToF-MS, but this did not contribute significantly to the overall measurement error. These results will improve quantification of commonly-measured biogenic volatile organic compound emissions and chemistry in the atmosphere. (C) 2018 The Authors. Published by Elsevier B.V.
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