Results 41 to 50 of about 1,345,257 (199)

Dynamic Solution Injection: a new method for preparing pptv–ppbv standard atmospheres of volatile organic compounds [PDF]

Atmospheric Measurement Techniques, 2010
Proton Transfer Reaction-Mass Spectrometry (PTR-MS) and thermal desorption Gas Chromatography-Mass Spectrometry (GC-MS) allow for absolute quantification of a wide range of atmospheric volatile organic compounds (VOCs) with concentrations in the ppbv to ...
L. Abrell, T. E. Huxman, K. J. Jardine, W. M. Henderson   +3 more
doaj   +1 more source

A novel method for producing NH4+ reagent ions in the hollow cathode glow discharge ion source of PTR-MS instruments

, 2020
Proton-transfer-reaction mass spectrometry (PTR-MS) is seeing an increased use of NH4+ ions for the detection of amines and labile oxygenated organic compounds. NH4+ ions are usually generated from ammonia or ammonium-containing chemicals.
M. Müller, F. Piel, R. Gutmann, P. Sulzer, E. Hartungen, A. Wisthaler   +5 more
semanticscholar   +1 more source

Validity and limitations of simple reaction kinetics to calculate concentrations of organic compounds from ion counts in PTR-MS

Atmospheric Measurement Techniques, 2019
. In September 2017, we conducted a proton-transfer-reaction mass-spectrometry (PTR-MS) intercomparison campaign at the CESAR observatory, a rural site in the central Netherlands near the village of Cabauw.
R. Holzinger, W. Acton, W. Bloss, M. Breitenlechner, L. Crilley, S. Dusanter, M. Gonin, V. Gros, F. Keutsch, A. Kiendler‐Scharr, L. Kramer, J. Krechmer, B. Languille, N. Locoge, F. Lopez‐Hilfiker, Dušan Materić, S. Moreno, E. Nemitz, L. Quéléver, Roland Sarda Esteve, S. Sauvage, S. Schallhart, R. Sommariva, R. Tillmann, Sergej Wedel, D. Worton, Kang-Ming Xu, Alexander Zaytsev   +27 more
semanticscholar   +1 more source

Vertical distribution of sources and sinks of volatile organic compounds within a boreal forest canopy [PDF]

Atmospheric Chemistry and Physics, 2023
The ecosystem–atmosphere flux of biogenic volatile organic compounds (BVOCs) has important impacts on tropospheric oxidative capacity and the formation of secondary organic aerosols, influencing air quality and climate.
R. Petersen, T. Holst, M. Mölder, N. Kljun, J. Rinne, J. Rinne   +5 more
doaj   +1 more source

First eddy covariance flux measurements by PTR-TOF [PDF]

Atmospheric Measurement Techniques, 2010
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 <i>m/z</i> 315 with a
M. Müller, M. Graus, T. M. Ruuskanen, R. Schnitzhofer, I. Bamberger, L. Kaser, T. Titzmann, L. Hörtnagl, G. Wohlfahrt, T. Karl, A. Hansel   +10 more
doaj   +1 more source

Gas-to-particle partitioning of major biogenic oxidation products: a study on freshly formed and aged biogenic SOA [PDF]

Atmospheric Chemistry and Physics, 2018
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 ...
G. I. Gkatzelis, T. Hohaus, R. Tillmann, I. Gensch, M. Müller, M. Müller, P. Eichler, P. Eichler, K.-M. Xu, P. Schlag, P. Schlag, S. H. Schmitt, Z. Yu, R. Wegener, M. Kaminski, R. Holzinger, A. Wisthaler, A. Wisthaler, A. Kiendler-Scharr   +18 more
doaj   +1 more source

Real-Time Monitoring of Trace Gas Concentrations in Syngas

Oil & Gas Science and Technology, 2013
A Proton Transfer Reaction Mass Spectrometer (PTR-MS) was used for the analysis of syngas in an industrial Fischer-Tropsch process. A PTR-MS can detect a variety of volatile organic and inorganic compounds in real-time and with high ...
Herbig J., Gutmann R., Winkler K., Hansel A., Sprachmann G.   +4 more
doaj   +1 more source

Bulk organic aerosol analysis by PTR-MS: an improved methodology for the determination of total organic mass, O:C and H:C elemental ratios and the average molecular formula.

Analytical Chemistry, 2019
We have recently shown in this journal (Müller et al., Anal. Chem. 2017, 89, 10889-10897) how a proton-transfer-reaction mass spectrometry (PTR-MS) analyzer measured particulate organic matter in urban atmospheres using the "Chemical Analysis of Aerosol ...
J. Léglise, M. Müller, F. Piel, Tobias Otto, A. Wisthaler   +4 more
semanticscholar   +1 more source

Sniffing out cocoa bean traits that persist in chocolates by PTR-MS, ICP-MS and IR-MS.

Food Research International, 2020
The cocoa botanical and geographical origin and the primary processing steps applied by cocoa farmers at the beginning of the supply chain influence the chemical compositional traits of the cocoa beans.
V. Acierno, L. D. de Jonge, S. V. van Ruth   +2 more
semanticscholar   +1 more source

Investigation of the aroma of commercial peach (Prunus persica L. Batsch) types by Proton Transfer Reaction-Mass Spectrometry (PTR-MS) and sensory analysis.

Food Research International, 2017
The aim of this study was to investigate the aroma and sensory profiles of various types of peaches (Prunus persica L. Batsch.). Forty-three commercial cultivars comprising peaches, flat peaches, nectarines, and canning peaches (pavías) were grown over ...
Tiago Bianchi, Yannick Weesepoel, A. Koot, I. Iglesias, I. Eduardo, M. Gratacós-Cubarsí, L. Guerrero, M. Hortós, S. V. van Ruth   +8 more
semanticscholar   +1 more source