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Journal articles on the topic 'PTR-TOF'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Warneke, C., P. Veres, S. M. Murphy, et al. "PTR-QMS versus PTR-TOF comparison in a region with oil and natural gas extraction industry in the Uintah Basin in 2013." Atmospheric Measurement Techniques 8, no. 1 (2015): 411–20. http://dx.doi.org/10.5194/amt-8-411-2015.

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Abstract. Here we compare volatile organic compound (VOC) measurements using a standard proton-transfer-reaction quadrupole mass spectrometer (PTR-QMS) with a new proton-transfer-reaction time of flight mass spectrometer (PTR-TOF) during the Uintah Basin Winter Ozone Study 2013 (UBWOS2013) field experiment in an oil and gas field in the Uintah Basin, Utah. The PTR-QMS uses a quadrupole, which is a mass filter that lets one mass to charge ratio pass at a time, whereas the PTR-TOF uses a time of flight mass spectrometer, which takes full mass spectra with typical 0.1 s–1 min integrated acquisiti

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2

Warneke, C., P. R. Veres, S. M. Murphy, et al. "PTR-QMS vs. PTR-TOF comparison in a region with oil and natural gas extraction industry in the Uintah Basin in 2013." Atmospheric Measurement Techniques Discussions 7, no. 7 (2014): 6565–93. http://dx.doi.org/10.5194/amtd-7-6565-2014.

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Abstract. Here we compare volatile organic compound (VOC) measurements using a standard Proton-Transfer-Reaction Quadrupole Mass Spectrometer (PTR-QMS) with a new Proton-Transfer-Reaction Time Of Flight Mass Spectrometer (PTR-TOF) during the Uintah Basin Winter Ozone Study 2013 (UBWOS2013) field experiment in an oil and gas field in the Uintah Basin, Utah. The PTR-QMS uses a quadrupole, which is a mass filter that lets one mass pass at a time, whereas the PTR-TOF uses a Time Of Flight mass spectrometer, which takes full mass spectra with typical 0.1 s to 1 min integrated acquisition times. The

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3

Müller, M., M. Graus, T. M. Ruuskanen, et al. "First eddy covariance flux measurements by PTR-TOF." Atmospheric Measurement Techniques Discussions 2, no. 6 (2009): 3265–90. http://dx.doi.org/10.5194/amtd-2-3265-2009.

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Abstract. The recently developed PTR-TOF instrument was evaluated to measure methanol fluxes emitted from grass land using the eddy covariance method. The high time resolution of the PTR-TOF allowed storing full mass spectra up to m/z 315 with a frequency of 10 Hz. Three isobaric ions were found at a nominal mass of m/z 33 due to the high mass resolving power of the PTR-TOF. Only one of the three peaks contributed to eddy covariance fluxes. The exact mass of this peak agrees well with the exact mass of protonated methanol (m/z 33.0335). The eddy covariance methanol fluxes measured with PTR-TOF

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Müller, M., M. Graus, T. M. Ruuskanen, et al. "First eddy covariance flux measurements by PTR-TOF." Atmospheric Measurement Techniques 3, no. 2 (2010): 387–95. http://dx.doi.org/10.5194/amt-3-387-2010.

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Abstract. The recently developed PTR-TOF instrument was evaluated to measure methanol fluxes emitted from grass land using the eddy covariance method. The high time resolution of the PTR-TOF allowed storing full mass spectra up to m/z 315 with a frequency of 10 Hz. Three isobaric ions were found at a nominal mass of m/z 33 due to the high mass resolving power of the PTR-TOF. Only one of the three peaks contributed to eddy covariance fluxes. The exact mass of this peak agrees well with the exact mass of protonated methanol (m/z 33.0335). The eddy covariance methanol fluxes measured with PTR-TOF

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5

Timkovsky, J., A. W. H. Chan, T. Dorst, A. H. Goldstein, B. Oyama, and R. Holzinger. "Organic aerosol composition measurements with advanced offline and in-situ techniques during the CalNex campaign." Atmospheric Measurement Techniques Discussions 7, no. 12 (2014): 12449–80. http://dx.doi.org/10.5194/amtd-7-12449-2014.

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Abstract. Our understanding of formation processes, physical properties and climate/health effects of organic aerosols is still limited in part due to limited knowledge of organic aerosol composition. We present speciated measurements of organic aerosol composition by two methods: in-situ thermal-desorption proton-transfer-reaction mass spectrometry (TD-PTR-MS) and offline two-dimensional gas chromatography with a time-of-flight mass spectrometer (GC×GC/TOF-MS). 153 compounds were identified using the GC×GC/TOF-MS, 123 of which were matched with 64 ions observed by the TD-PTR-MS. A reasonable

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Timkovsky, J., A. W. H. Chan, T. Dorst, A. H. Goldstein, B. Oyama, and R. Holzinger. "Comparison of advanced offline and in situ techniques of organic aerosol composition measurement during the CalNex campaign." Atmospheric Measurement Techniques 8, no. 12 (2015): 5177–87. http://dx.doi.org/10.5194/amt-8-5177-2015.

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Abstract. Our understanding of formation processes, physical properties, and climate/health effects of organic aerosols is still limited in part due to limited knowledge of organic aerosol composition. We present speciated measurements of organic aerosol composition by two methods: in situ thermal-desorption proton-transfer-reaction mass spectrometry (TD-PTR-MS) and offline two-dimensional gas chromatography with a time-of-flight mass spectrometer (GC × GC/TOF-MS). Using the GC × GC/TOF-MS 153 compounds were identified, 123 of which were matched with 64 ions observed by the TD-PTR-MS. A reason

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7

Park, Seung-Myung, Byeong-Hun Oh, Chang Hyeok Kim, et al. "Real-Time Observation and Comparison of Atmospheric Formaldehyde Using PTR-ToF-MS and Mid-infrared Spectroscopy Based on Optical Absorption." Journal of Environmental Analysis, Health and Toxicology 28, no. 1 (2025): 37–49. https://doi.org/10.36278/jeaht.28.1.37.

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This study investigated the real-time formaldehyde (HCHO) concentrations in an urban area of Ansan, South Korea, during the summer of 2024, using Proton Transfer Reaction Time-of-Flight Mass Spectrometry (PTR-ToF-MS) and Mid-Infrared Spectrometer (MIRA). Average concentrations of HCHO were 4.8±1.7 ppb for PTR-ToF-MS and 3.5±0.7 ppb for MIRA with PTR-ToF-MS, exhibiting higher sensitivity to HCHO variations. Findings with both instruments showed similar temporal trends (R2=0.82) with HCHO concentrations peaking during the daytime (PTR: 6.4 ppb, MIRA: 4.3 ppb) and declining at night (PTR: 2.1 ppb

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8

Park, J. H., A. H. Goldstein, J. Timkovsky, et al. "Eddy covariance emission and deposition flux measurements using proton transfer reaction – time of flight – mass spectrometry (PTR-TOF-MS): comparison with PTR-MS measured vertical gradients and fluxes." Atmospheric Chemistry and Physics 13, no. 3 (2013): 1439–56. http://dx.doi.org/10.5194/acp-13-1439-2013.

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Abstract. During summer 2010, a proton transfer reaction – time of flight – mass spectrometer (PTR-TOF-MS) and a quadrupole proton transfer reaction mass spectrometer (PTR-MS) were deployed simultaneously for one month in an orange orchard in the Central Valley of California to collect continuous data suitable for eddy covariance (EC) flux calculations. The high time resolution (5 Hz) and high mass resolution (up to 5000 m/Δm) data from the PTR-TOF-MS provided the basis for calculating the concentration and flux for a wide range of volatile organic compounds (VOC). Throughout the campaign, 664

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9

Park, J. H., A. H. Goldstein, J. Timkovsky, et al. "Eddy covariance emission and deposition flux measurements using proton transfer reaction-time of flight-mass spectrometry (PTR-TOF-MS): comparison with PTR-MS measured vertical gradients and fluxes." Atmospheric Chemistry and Physics Discussions 12, no. 8 (2012): 20435–82. http://dx.doi.org/10.5194/acpd-12-20435-2012.

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Abstract. During summer 2010, a proton transfer reaction-time of flight-mass spectrometer (PTR-TOF-MS) and a standard proton transfer reaction mass spectrometer (PTR-MS) were deployed simultaneously for one month in an orange orchard in the Central Valley of California to collect continuous data suitable for eddy covariance (EC) flux calculations. The high time resolution (5 Hz) and high mass resolution (up to 5000 m Δ m−1) data from the PTR-TOF-MS provided the basis for calculating the concentration and flux for a wide range of volatile organic compounds (VOC). Throughout the campaign, 664 ma

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10

Wu, Caihong, Chaomin Wang, Sihang Wang, et al. "Measurement report: Important contributions of oxygenated compounds to emissions and chemistry of volatile organic compounds in urban air." Atmospheric Chemistry and Physics 20, no. 23 (2020): 14769–85. http://dx.doi.org/10.5194/acp-20-14769-2020.

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Abstract. Volatile organic compounds (VOCs) play important roles in the tropospheric atmosphere. In this study, VOCs were measured at an urban site in Guangzhou, one of the megacities in the Pearl River Delta (PRD), using a gas chromatograph–mass spectrometer/flame ionization detection (GC–MS/FID) and a proton transfer reaction time-of-flight mass spectrometer (PTR-ToF-MS). Diurnal profile analyses show that stronger chemical removal by OH radicals for more reactive hydrocarbons occurs during the daytime, which is used to estimate the daytime average OH radical concentration. In comparison, di

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11

Wang, Sihang, Bin Yuan, Caihong Wu, et al. "Oxygenated volatile organic compounds (VOCs) as significant but varied contributors to VOC emissions from vehicles." Atmospheric Chemistry and Physics 22, no. 14 (2022): 9703–20. http://dx.doi.org/10.5194/acp-22-9703-2022.

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Abstract. Vehicular emissions are an important source for volatile organic compounds (VOCs) in urban and downwind regions. In this study, we conducted a chassis dynamometer study to investigate VOC emissions from vehicles using gasoline, diesel, and liquefied petroleum gas (LPG) as fuel. Time-resolved VOC emissions from vehicles are chemically characterized by a proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) with high frequency. Our results show that emission factors of VOCs generally decrease with the improvement of emission standards for gasoline vehicles, whereas var

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12

Kaser, L., T. Karl, R. Schnitzhofer, et al. "Comparison of different real time VOC measurement techniques in a ponderosa pine forest." Atmospheric Chemistry and Physics Discussions 12, no. 10 (2012): 27955–88. http://dx.doi.org/10.5194/acpd-12-27955-2012.

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Abstract. Volatile organic compound (VOC) mixing ratios measured by five independent instruments are compared at a forested site dominated by ponderosa pine (Pinus Ponderosa) during the BEACHON-ROCS field study in summer 2010. The instruments included a Proton Transfer Reaction Time of Flight Mass Spectrometer (PTR-TOF-MS), a Proton Transfer Reaction Quadrupole Mass Spectrometer (PTR-MS), a Fast Online Gas-Chromatograph coupled to a Mass Spectrometer (GC/MS; TOGA), a Thermal Dissociation Chemical Ionization Mass Spectrometer (PAN-CIMS) and a Fiber Laser-Induced Fluorescence Instrument (FILIF).

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13

Kaser, L., T. Karl, R. Schnitzhofer, et al. "Comparison of different real time VOC measurement techniques in a ponderosa pine forest." Atmospheric Chemistry and Physics 13, no. 5 (2013): 2893–906. http://dx.doi.org/10.5194/acp-13-2893-2013.

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Abstract. Volatile organic compound (VOC) mixing ratios measured by five independent instruments are compared at a forested site dominated by ponderosa pine (Pinus Ponderosa) during the BEACHON-ROCS field study in summer 2010. The instruments included a Proton Transfer Reaction Time of Flight Mass Spectrometer (PTR-TOF-MS), a Proton Transfer Reaction Quadrupole Mass Spectrometer (PTR-MS), a Fast Online Gas-Chromatograph coupled to a Mass Spectrometer (GC/MS; TOGA), a Thermal Dissociation Chemical Ionization Mass Spectrometer (PAN-CIMS) and a Fiber Laser-Induced Fluorescence Instrument (FILIF).

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14

Koss, Abigail R., Kanako Sekimoto, Jessica B. Gilman, et al. "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, no. 5 (2018): 3299–319. http://dx.doi.org/10.5194/acp-18-3299-2018.

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Abstract. Volatile and intermediate-volatility non-methane organic gases (NMOGs) released from biomass burning were measured during laboratory-simulated wildfires by proton-transfer-reaction time-of-flight mass spectrometry (PTR-ToF). We identified NMOG contributors to more than 150 PTR ion masses using gas chromatography (GC) pre-separation with electron ionization, H3O+ chemical ionization, and NO+ chemical ionization, an extensive literature review, and time series correlation, providing higher certainty for ion identifications than has been previously available. Our interpretation of the P

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15

Herbig, Jens, Markus Müller, Simon Schallhart, Thorsten Titzmann, Martin Graus, and Armin Hansel. "On-line breath analysis with PTR-TOF." Journal of Breath Research 3, no. 2 (2009): 027004. http://dx.doi.org/10.1088/1752-7155/3/2/027004.

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16

Acton, W. J. F., S. Schallhart, B. Langford, et al. "Canopy-scale flux measurements and bottom-up emission estimates of volatile organic compounds from a mixed oak and hornbeam forest in northern Italy." Atmospheric Chemistry and Physics Discussions 15, no. 20 (2015): 29213–64. http://dx.doi.org/10.5194/acpd-15-29213-2015.

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Abstract. This paper reports the fluxes and mixing ratios of biogenically emitted volatile organic compounds (BVOCs) 4 m above a mixed oak and hornbeam forest in northern Italy. Fluxes of methanol, acetaldehyde, isoprene, methyl vinyl ketone + methacrolein, methyl ethyl ketone and monoterpenes were obtained using both a proton transfer reaction-mass spectrometer (PTR-MS) and a proton transfer reaction-time of flight-mass spectrometer (PTR-ToF-MS) together with the methods of virtual disjunct eddy covariance (PTR-MS) and eddy covariance (PTR-ToF-MS). Isoprene was the dominant emitted compound w

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17

Acton, W. Joe F., Simon Schallhart, Ben Langford, et al. "Canopy-scale flux measurements and bottom-up emission estimates of volatile organic compounds from a mixed oak and hornbeam forest in northern Italy." Atmospheric Chemistry and Physics 16, no. 11 (2016): 7149–70. http://dx.doi.org/10.5194/acp-16-7149-2016.

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Abstract. This paper reports the fluxes and mixing ratios of biogenically emitted volatile organic compounds (BVOCs) 4 m above a mixed oak and hornbeam forest in northern Italy. Fluxes of methanol, acetaldehyde, isoprene, methyl vinyl ketone + methacrolein, methyl ethyl ketone and monoterpenes were obtained using both a proton-transfer-reaction mass spectrometer (PTR-MS) and a proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) together with the methods of virtual disjunct eddy covariance (using PTR-MS) and eddy covariance (using PTR-ToF-MS). Isoprene was the dominant emitte

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18

Coggon, Matthew M., Chelsea E. Stockwell, Megan S. Claflin, et al. "Identifying and correcting interferences to PTR-ToF-MS measurements of isoprene and other urban volatile organic compounds." Atmospheric Measurement Techniques 17, no. 2 (2024): 801–25. http://dx.doi.org/10.5194/amt-17-801-2024.

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Abstract. Proton-transfer-reaction time-of-flight mass spectrometry (PTR-ToF-MS) is a technique commonly used to measure ambient volatile organic compounds (VOCs) in urban, rural, and remote environments. PTR-ToF-MS is known to produce artifacts from ion fragmentation, which complicates the interpretation and quantification of key atmospheric VOCs. This study evaluates the extent to which fragmentation and other ionization processes impact urban measurements of the PTR-ToF-MS ions typically assigned to isoprene (m/z 69, C5H8H+), acetaldehyde (m/z 45, CH3CHO+), and benzene (m/z 79, C6H6H+). Int

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19

Pugliese, Giovanni, Felix Piel, Phillip Trefz, Philipp Sulzer, Jochen K. Schubert, and Wolfram Miekisch. "Effects of modular ion-funnel technology onto analysis of breath VOCs by means of real-time mass spectrometry." Analytical and Bioanalytical Chemistry 412, no. 26 (2020): 7131–40. http://dx.doi.org/10.1007/s00216-020-02846-8.

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Abstract Proton transfer reaction time-of-flight mass spectrometry (PTR-ToF-MS) is a powerful tool for real-time monitoring of trace concentrations of volatile organic compounds (VOCs). The sensitivity of PTR-ToF-MS also depends on the ability to effectively focus and transmit ions from the relatively high-pressure drift tube (DT) to the low-pressure mass analyzer. In the present study, a modular ion-funnel (IF) is placed adjacent to the DT of a PTR-ToF-MS instrument to improve the ion-focusing. IF consists of a series of electrodes with gradually decreasing orifice diameters. Radio frequency

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Li, Haiyan, Matthieu Riva, Pekka Rantala, et al. "Terpenes and their oxidation products in the French Landes forest: insights from Vocus PTR-TOF measurements." Atmospheric Chemistry and Physics 20, no. 4 (2020): 1941–59. http://dx.doi.org/10.5194/acp-20-1941-2020.

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Abstract. The capabilities of the recently developed Vocus proton-transfer-reaction time-of-flight mass spectrometer (PTR-TOF) are reported for the first time based on ambient measurements. With the deployment of the Vocus PTR-TOF, we present an overview of the observed gas-phase (oxygenated) molecules in the French Landes forest during summertime 2018 and gain insights into the atmospheric oxidation of terpenes, which are emitted in large quantities in the atmosphere and play important roles in secondary organic aerosol production. Due to the greatly improved detection efficiency compared to

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Lee, Kyungwon, Keehong Kim, Hannuei Gil, Buju Gong та Jungmin Park. "PTR-TOF-MS를 이용한 농업잔재물 소각의 배출오염물질 연구". Journal of the Korean Society of Urban Environment 22, № 4 (2022): 229–37. http://dx.doi.org/10.33768/ksue.2022.22.4.229.

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22

Li, Haiyan, Thomas Golin Almeida, Yuanyuan Luo, et al. "Fragmentation inside proton-transfer-reaction-based mass spectrometers limits the detection of ROOR and ROOH peroxides." Atmospheric Measurement Techniques 15, no. 6 (2022): 1811–27. http://dx.doi.org/10.5194/amt-15-1811-2022.

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Abstract. Proton transfer reaction (PTR) is a commonly applied ionization technique for mass spectrometers, in which hydronium ions (H3O+) transfer a proton to analytes with higher proton affinities than the water molecule. This method has most commonly been used to quantify volatile hydrocarbons, but later-generation PTR instruments have been designed for better throughput of less volatile species, allowing detection of more functionalized molecules as well. For example, the recently developed Vocus PTR time-of-flight mass spectrometer (PTR-TOF) has been shown to agree well with an iodide-add

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23

Håland, Alexander, Tomáš Mikoviny, Elisabeth Emilie Syse, and Armin Wisthaler. "On the development of a new prototype PTR-ToF-MS instrument and its application to the detection of atmospheric amines." Atmospheric Measurement Techniques 15, no. 21 (2022): 6297–307. http://dx.doi.org/10.5194/amt-15-6297-2022.

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Abstract. We herein report on the development of a new prototype PTR-ToF-MS (proton-transfer-reaction time-of-flight mass spectrometry) instrument that combines a hollow cathode glow discharge (HCGD) ion source with a focusing ion–molecule reactor (FIMR), which consists of a resistive glass drift tube surrounded by quadrupole rods. The new instrument configuration hybridizes the two main current commercial PTR-ToF-MS instrument designs. We provide a detailed technical description of the new analyzer and its optimized operational settings for detecting volatile amines via proton transfer reacti

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24

Biasioli, F., E. Aprea, F. Gasperi, and T. D. Märk. "Measuring odour emission and biofilter efficiency in composting plants by proton transfer reaction-mass spectrometry." Water Science and Technology 59, no. 7 (2009): 1263–69. http://dx.doi.org/10.2166/wst.2009.107.

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PTR-MS (Proton Transfer Reaction-Mass Spectrometry) is an innovative technique that allows the rapid detection of most volatile organic compounds (VOCs) with high sensitivity (sub-ppb) and by direct injection. We describe here the possible use of PTR-MS in waste managements and composting plants both for the real time monitoring of volatile emissions and, after calibration with olfactometric assessments, for the instrumental determination of odour concentration. Beside a short description of the technique, we will report on the calibration of PTR-MS data with olfactometric assessment of odour

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25

Corvino, Antonia, Iuliia Khomenko, Emanuela Betta, et al. "Rapid Profiling of Volatile Organic Compounds Associated with Plant-Based Milks Versus Bovine Milk Using an Integrated PTR-ToF-MS and GC-MS Approach." Molecules 30, no. 4 (2025): 761. https://doi.org/10.3390/molecules30040761.

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The growing demand for plant-based beverages has underscored the importance of investigating their volatile profiles, which play a crucial role in sensory perception and consumer acceptance. This is especially true for plant-based milks (PBMs) that have a clear reference model in bovine milk. This study characterises the volatile organic compounds (VOCs) in soy, almond and oat beverages compared to bovine milk using proton transfer reaction-time of flight-mass spectrometry (PTR-ToF-MS) as a rapid and noninvasive screening tool, complemented by gas chromatography-mass spectrometry (GC-MS) for c

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26

Michoud, Vincent, Stéphane Sauvage, Thierry Léonardis, et al. "Field measurements of methylglyoxal using proton transfer reaction time-of-flight mass spectrometry and comparison to the DNPH–HPLC–UV method." Atmospheric Measurement Techniques 11, no. 10 (2018): 5729–40. http://dx.doi.org/10.5194/amt-11-5729-2018.

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Abstract. Methylglyoxal (MGLY) is an important atmospheric α-dicarbonyl species for which photolysis acts as a significant source of peroxy radicals, contributing to the oxidizing capacity of the atmosphere and, as such, the formation of secondary pollutants such as organic aerosols and ozone. However, despite its importance, only a few techniques exhibit time resolutions and detection limits that are suitable for atmospheric measurements. This study presents the first field measurements of MGLY by proton transfer reaction time-of-flight mass spectrometry (PTR-ToF-MS) performed during the ChAr

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27

Cappellin, Luca, Franco Biasioli, Alessandra Fabris, et al. "Improved mass accuracy in PTR-TOF-MS: Another step towards better compound identification in PTR-MS." International Journal of Mass Spectrometry 290, no. 1 (2010): 60–63. http://dx.doi.org/10.1016/j.ijms.2009.11.007.

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Peng, Yarong, Hongli Wang, Yaqin Gao, et al. "Real-time measurement of phase partitioning of organic compounds using a proton-transfer-reaction time-of-flight mass spectrometer coupled to a CHARON inlet." Atmospheric Measurement Techniques 16, no. 1 (2023): 15–28. http://dx.doi.org/10.5194/amt-16-15-2023.

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Abstract. Understanding the gas–particle partitioning of semivolatile organic compounds (SVOCs) is of crucial importance in the accurate representation of the global budget of atmospheric organic aerosols. In this study, we quantified the gas- vs. particle-phase fractions of a large number of SVOCs in real time in an urban area of East China with the use of a CHemical Analysis of aeRosols ONline (CHARON) inlet coupled to a high-resolution proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS). We demonstrated the use of the CHARON inlet for highly efficient collection of partic

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Weiss, Florentin, Christoph Schaefer, Stefan Zimmermann, Tilmann D. Märk, and Chris A. Mayhew. "Revealing the Ion Chemistry Occurring in High Kinetic Energy-Ion Mobility Spectrometry: A Proof of Principle Study." Analytica 4, no. 2 (2023): 113–25. http://dx.doi.org/10.3390/analytica4020010.

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Here, we present proof of principle studies to demonstrate how the product ions associated with the ion mobility peaks obtained from a High Kinetic Energy-Ion Mobility Spectrometer (HiKE-IMS) measurement of a volatile can be identified using a Proton Transfer Reaction/Selective Reagent Ion-Time-of-Flight-Mass Spectrometer (PTR/SRI-ToF-MS) when operating both instruments at the same reduced electric field value and similar humidities. This identification of product ions improves our understanding of the ion chemistry occurring in the ion source region of a HiKE-IMS. The combination of the two a

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30

Masi, Elisa, Annalisa Romani, Camilla Pandolfi, Daniela Heimler, and Stefano Mancuso. "PTR-TOF-MS analysis of volatile compounds in olive fruits." Journal of the Science of Food and Agriculture 95, no. 7 (2014): 1428–34. http://dx.doi.org/10.1002/jsfa.6837.

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Sanchez, Dianne, Roger Seco, Dasa Gu, et al. "Contributions to OH reactivity from unexplored volatile organic compounds measured by PTR-ToF-MS – a case study in a suburban forest of the Seoul metropolitan area during the Korea–United States Air Quality Study (KORUS-AQ) 2016." Atmospheric Chemistry and Physics 21, no. 8 (2021): 6331–45. http://dx.doi.org/10.5194/acp-21-6331-2021.

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Abstract. We report OH reactivity observations by a chemical ionization mass spectrometer–comparative reactivity method (CIMS-CRM) instrument in a suburban forest of the Seoul metropolitan area (SMA) during the Korea–United States Air Quality Study (KORUS-AQ 2016) from mid-May to mid-June of 2016. A comprehensive observational suite was deployed to quantify reactive trace gases inside of the forest canopy including a high-resolution proton transfer reaction time-of-flight mass spectrometer (PTR-ToF-MS). An average OH reactivity of 30.7±5.1 s−1 was observed, while the OH reactivity calculated f

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Coggon, Matthew M., Christopher Y. Lim, Abigail R. Koss, et al. "OH chemistry of non-methane organic gases (NMOGs) emitted from laboratory and ambient biomass burning smoke: evaluating the influence of furans and oxygenated aromatics on ozone and secondary NMOG formation." Atmospheric Chemistry and Physics 19, no. 23 (2019): 14875–99. http://dx.doi.org/10.5194/acp-19-14875-2019.

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Abstract. Chamber oxidation experiments conducted at the Fire Sciences Laboratory in 2016 are evaluated to identify important chemical processes contributing to the hydroxy radical (OH) chemistry of biomass burning non-methane organic gases (NMOGs). Based on the decay of primary carbon measured by proton transfer reaction time-of-flight mass spectrometry (PTR-ToF-MS), it is confirmed that furans and oxygenated aromatics are among the NMOGs emitted from western United States fuel types with the highest reactivities towards OH. The oxidation processes and formation of secondary NMOG masses measu

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Jensen, Niels Roland, Carsten Gruening, Ignacio Goded, Markus Müller, Jens Hjorth, and Armin Wisthaler. "Eddy-covariance flux measurements in an Italian deciduous forest using PTR-ToF-MS, PTR-QMS and FIS." International Journal of Environmental Analytical Chemistry 98, no. 8 (2018): 758–88. http://dx.doi.org/10.1080/03067319.2018.1502758.

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Capozzi, Vittorio, Valentina Lonzarich, Iuliia Khomenko, Luca Cappellin, Luciano Navarini, and Franco Biasioli. "Unveiling the Molecular Basis of Mascarpone Cheese Aroma: VOCs analysis by SPME-GC/MS and PTR-ToF-MS." Molecules 25, no. 5 (2020): 1242. http://dx.doi.org/10.3390/molecules25051242.

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Mascarpone, a soft-spread cheese, is an unripened dairy product manufactured by the thermal-acidic coagulation of milk cream. Due to the mild flavor and creamy consistency, it is a base ingredient in industrial, culinary, and homemade preparations (e.g., it is a key constituent of a widely appreciated Italian dessert ‘Tiramisù’). Probably due to this relevance as an ingredient rather than as directly consumed foodstuff, mascarpone has not been often the subject of detailed studies. To the best of our knowledge, no investigation has been carried out on the volatile compounds contributing to the

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Badra, Zaid, Sebastian Larsson Herrera, Luca Cappellin, et al. "Species-Specific Induction of Plant Volatiles by Two Aphid Species in Apple: Real Time Measurement of Plant Emission and Attraction of Lacewings in the Wind Tunnel." Journal of Chemical Ecology 47, no. 7 (2021): 653–63. http://dx.doi.org/10.1007/s10886-021-01288-5.

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AbstractUpon damage by herbivores, plants release herbivory-induced plant volatiles (HIPVs). To find their prey, the pest’s natural enemies need to be fine-tuned to the composition of these volatiles. Whereas standard methods can be used in the identification and quantitation of HIPVs, more recently introduced techniques such as PTR-ToF–MS provide temporal patterns of the volatile release and detect additional compounds. In this study, we compared the volatile profile of apple trees infested with two aphid species, the green apple aphid Aphis pomi, and the rosy apple aphid Dysaphis plantaginea

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Shin, Su-Hyun, Jong-Sung Park, Jong Bum Kim, et al. "Characteristics of Volatile Organic Compounds Distribution in Downtown Ansan Near Industrial Complexes." Journal of Environmental Analysis, Health and Toxicology 27, no. 1 (2024): 14–28. http://dx.doi.org/10.36278/jeaht.27.1.14.

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There are four industrial complexes located around Ansan City, which is one of the areas with the highest VOCs emissions in Gyeonggi region based on the emissions provided by the clean policy support system (CAPSS), Korea. In this study, proton transfer reaction time-of-flight mass spectrometer (PTR-TOF-MS) was used to determine the distribution of volatile organic compounds (VOCs) in urban areas near industrial complexes in Ansan City in 2023 (May to June). The PTR-TOF-MS was operated over the mass range of 10-400amu at a drift tube pressure of 2.3mbar and temperature 80<sup>o</sup&g

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Gkatzelis, Georgios I., Thorsten Hohaus, Ralf Tillmann, et al. "Gas-to-particle partitioning of major biogenic oxidation products: a study on freshly formed and aged biogenic SOA." Atmospheric Chemistry and Physics 18, no. 17 (2018): 12969–89. http://dx.doi.org/10.5194/acp-18-12969-2018.

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Abstract. Secondary organic aerosols (SOAs) play a key role in climate change and air quality. Determining the fundamental parameters that distribute organic compounds between the phases is essential, as atmospheric lifetime and impacts change drastically between the gas and particle phase. In this work, gas-to-particle partitioning of major biogenic oxidation products was investigated using three different aerosol chemical characterization techniques. The aerosol collection module, the collection thermal desorption unit, and the chemical analysis of aerosols online are different aerosol sampl

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Holzinger, R. "PTRwid: A new widget tool for processing PTR-TOF-MS data." Atmospheric Measurement Techniques 8, no. 9 (2015): 3903–22. http://dx.doi.org/10.5194/amt-8-3903-2015.

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Abstract. PTRwid is a fast and user friendly tool that has been developed to process data from proton-transfer-reaction time-of-flight mass spectrometers (PTR-TOF-MS) that use HTOF (high-resolution time-of-flight) mass spectrometers from Tofwerk AG (Switzerland). PTRwid is designed for a comprehensive evaluation of whole laboratory or field-based studies. All processing runs autonomously, and entire laboratory or field campaigns can, in principle, be processed with a few mouse clicks. Unique features of PTRwid include (i) an autonomous and accurate mass scale calibration, (ii) the computation

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Holzinger, R. "PTRwid: a new widget-tool for processing PTR-TOF-MS data." Atmospheric Measurement Techniques Discussions 8, no. 2 (2015): 1629–69. http://dx.doi.org/10.5194/amtd-8-1629-2015.

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Abstract. PTRwid is a fast and user friendly tool that has been developed to process data from proton-transfer-reaction time-of-flight mass-spectrometers (PTR-TOF-MS) that use HTOF time-of-flight mass-spectrometers from Tofwerk AG (Switzerland). PTRwid is designed for a comprehensive evaluation of whole laboratory or field based studies. All processing runs autonomously and whole laboratory or field campaigns can, in principle, be processed with a few mouse clicks. Unique features of PTRwid include (i) an autonomous and accurate mass scale calibration, (ii) the computation of an "Unified Mass

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Lee, Kyungwon, Keehong Kim, Gyutae Park, Jungmin Park, and Buju Gong. "A study on monitoring swine farm odor by PTR-TOF-MS." Journal of Odor and Indoor Environment 21, no. 4 (2022): 225–36. http://dx.doi.org/10.15250/joie.2022.21.4.225.

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Cappellin, Luca, Eugenio Aprea, Pablo Granitto, et al. "Linking GC-MS and PTR-TOF-MS fingerprints of food samples." Chemometrics and Intelligent Laboratory Systems 118 (August 2012): 301–7. http://dx.doi.org/10.1016/j.chemolab.2012.05.008.

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Riva, Matthieu, Pekka Rantala, Jordan E. Krechmer, et al. "Evaluating the performance of five different chemical ionization techniques for detecting gaseous oxygenated organic species." Atmospheric Measurement Techniques 12, no. 4 (2019): 2403–21. http://dx.doi.org/10.5194/amt-12-2403-2019.

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Abstract. The impact of aerosols on climate and air quality remains poorly understood due to multiple factors. One of the current limitations is the incomplete understanding of the contribution of oxygenated products, generated from the gas-phase oxidation of volatile organic compounds (VOCs), to aerosol formation. Indeed, atmospheric gaseous chemical processes yield thousands of (highly) oxygenated species, spanning a wide range of chemical formulas, functional groups and, consequently, volatilities. While recent mass spectrometric developments have allowed extensive on-line detection of a my

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Gkatzelis, Georgios I., Ralf Tillmann, Thorsten Hohaus, et al. "Comparison of three aerosol chemical characterization techniques utilizing PTR-ToF-MS: a study on freshly formed and aged biogenic SOA." Atmospheric Measurement Techniques 11, no. 3 (2018): 1481–500. http://dx.doi.org/10.5194/amt-11-1481-2018.

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Abstract. An intercomparison of different aerosol chemical characterization techniques has been performed as part of a chamber study of biogenic secondary organic aerosol (BSOA) formation and aging at the atmosphere simulation chamber SAPHIR (Simulation of Atmospheric PHotochemistry In a large Reaction chamber). Three different aerosol sampling techniques – the aerosol collection module (ACM), the chemical analysis of aerosol online (CHARON) and the collection thermal-desorption unit (TD) were connected to proton transfer reaction time-of-flight mass spectrometers (PTR-ToF-MSs) to provide chem

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Kim, Chang Hyeok, Jeongho Kim, Sujin Noh, et al. "A Study on Temporal-Spatial Characteristics of Volatile Organic Compounds Distributed near Petrochemical Industrial Complex using PTR-ToF-MS." Journal of Korean Society for Atmospheric Environment 37, no. 5 (2021): 812–28. http://dx.doi.org/10.5572/kosae.2021.37.5.812.

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Panarese, Alessia, Brian Farneti, Angelo Zanella, and Iuliia Khomenko. "Non-Destructive PTR-ToF-MS Profiling of Red Delicious and Granny Smith Apple Volatilomes During Ripening." Agriculture 15, no. 6 (2025): 638. https://doi.org/10.3390/agriculture15060638.

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The optimal harvest date (OHD) for the long-term storage of apple fruits is of the utmost importance, not only for maintaining high quality levels, but also because the ripening stage, regulated by the autocatalytic activity of the internal ethylene concentration, greatly affects the VOCs’ synthesis. During apple ripening, chemical compounds undergo changes that affect the fruit’s overall quality, particularly its aromatic profile. Three main classes of organic molecules—aldehydes, alcohols, and esters—play a key role in these modifications. This study investigated the potential of proton tran

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Marques, Baptiste, Evangelia Kostenidou, Alvaro Martinez Valiente, et al. "Detailed Speciation of Non-Methane Volatile Organic Compounds in Exhaust Emissions from Diesel and Gasoline Euro 5 Vehicles Using Online and Offline Measurements." Toxics 10, no. 4 (2022): 184. http://dx.doi.org/10.3390/toxics10040184.

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The characterization of vehicle exhaust emissions of volatile organic compounds (VOCs) is essential to estimate their impact on the formation of secondary organic aerosol (SOA) and, more generally, air quality. This paper revises and updates non-methane volatile organic compounds (NMVOCs) tailpipe emissions of three Euro 5 vehicles during Artemis cold urban (CU) and motorway (MW) cycles. Positive matrix factorization (PMF) analysis is carried out for the first time on proton transfer reaction time-of-flight mass spectrometer (PTR-ToF-MS) datasets of vehicular emission. Statistical analysis hel

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Li, R., C. Warneke, M. Graus, et al. "Measurements of hydrogen sulfide (H<sub>2</sub>S) using PTR-MS: calibration, humidity dependence, inter-comparison and results from field studies in an oil and gas production region." Atmospheric Measurement Techniques 7, no. 10 (2014): 3597–610. http://dx.doi.org/10.5194/amt-7-3597-2014.

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Abstract. Natural gas production is associated with emissions of several trace gases, some of them classified as air toxics. While volatile organic compounds (VOCs) have received much attention, hydrogen sulfide (H2S) can also be of concern due to the known health impacts of exposure to this hazardous air pollutant. Here, we present quantitative, fast time-response measurements of H2S using proton-transfer-reaction mass-spectrometry (PTR-MS) instruments. An ultra-light-weight PTR-MS (ULW-PTR-MS) in a mobile laboratory was operated for measurements of VOCs and H2S in a gas and oil field during

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Ruuskanen, T. M., M. Müller, R. Schnitzhofer, et al. "Eddy covariance VOC emission and deposition fluxes above grassland using PTR-TOF." Atmospheric Chemistry and Physics Discussions 10, no. 9 (2010): 21077–108. http://dx.doi.org/10.5194/acpd-10-21077-2010.

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Abstract. Eddy covariance (EC) is the preferable technique for flux measurements since it is the only direct flux determination method. It requires a continuum of high time resolution measurements (e.g. 5–20 Hz). For volatile organic compounds (VOC) soft ionization via proton transfer reaction has proven to be a quantitative method for real time mass spectrometry; here we use a proton transfer reaction time of flight mass spectrometer (PTR-TOF) for 10 Hz EC measurements of full mass spectra up to m/z 315. The mass resolution of the PTR-TOF enabled the identification of chemical formulas and se

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Ruuskanen, T. M., M. Müller, R. Schnitzhofer, et al. "Eddy covariance VOC emission and deposition fluxes above grassland using PTR-TOF." Atmospheric Chemistry and Physics 11, no. 2 (2011): 611–25. http://dx.doi.org/10.5194/acp-11-611-2011.

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Abstract. Eddy covariance (EC) is the preferable technique for flux measurements since it is the only direct flux determination method. It requires a continuum of high time resolution measurements (e.g. 5–20 Hz). For volatile organic compounds (VOC) soft ionization via proton transfer reaction has proven to be a quantitative method for real time mass spectrometry; here we use a proton transfer reaction time of flight mass spectrometer (PTR-TOF) for 10 Hz EC measurements of full mass spectra up to m/z 315. The mass resolution of the PTR-TOF enabled the identification of chemical formulas and se

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Farneti, Brian, Iuliia Khomenko, Luca Cappellin, et al. "Comprehensive VOC profiling of an apple germplasm collection by PTR-ToF-MS." Metabolomics 11, no. 4 (2014): 838–50. http://dx.doi.org/10.1007/s11306-014-0744-9.

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