Journal article
Adaptation of a proton transfer reaction mass spectrometer instrument to employ NO+ as reagent ion for the detection of 1,3-butadiene in the ambient atmosphere
Rapid communications in mass spectrometry, v 23(20), pp 3301-3308
30 Oct 2009
PMID: 19760643
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
A proton transfer reaction mass spectrometer (PTR-MS) instrument was adapted to employ NO+ as a chemical reagent ion without any hardware changes by switching the reagent ion source gas from water vapor to dry air. Ionization of dry air within the hollow cathode ion source generates a very intense source of NO+ with only a minor impurity of NO2+. The intensities of the primary NO+ reagent ion and the unwanted impurity NO2+ are controllable and dependent on the operational conditions of the hollow cathode ion source. Ion source tuning parameters are described, which maintain an intense source of NO+ while keeping the impurity NO2+ signal to less than 2% of the total reagent ion intensity. This method is applied to the detection of 1,3-butadiene. NO+ reacts efficiently with 1,3-butadiene via a charge exchange reaction to produce only the molecular ion, which is detected at m/z 54. Detection sensitivities of the order of 45 pptv for a 1-s measurement of 1,3-butadiene are demonstrated. We present the first real-time on-line sub parts per billion measurement of 1,3-butadiene in the ambient atmosphere. The only likely interference is from 1,2-butadiene. Concurrent measurements of benzene are provided and suggest that the vehicular emissions are the predominant source of 1,3-butadiene in a suburban Boston area monitoring location.
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Details
- Title
- Adaptation of a proton transfer reaction mass spectrometer instrument to employ NO+ as reagent ion for the detection of 1,3-butadiene in the ambient atmosphere
- Creators
- W B Knighton - Montana State UniversityE C FortnerS C HerndonE C WoodR C Miake-Lye
- Publication Details
- Rapid communications in mass spectrometry, v 23(20), pp 3301-3308
- Publisher
- Wiley
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemistry
- Web of Science ID
- WOS:000270752700007
- Scopus ID
- 2-s2.0-70449449412
- Other Identifier
- 991020902864404721
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- Collaboration types
- Industry collaboration
- Domestic collaboration
- Web of Science research areas
- Biochemical Research Methods
- Chemistry, Analytical
- Spectroscopy