Results 21 to 30 of about 1,345,257 (199)

A comparison of GC-FID and PTR-MS toluene measurements in ambient air under conditions of enhanced monoterpene loading [PDF]

Atmospheric Measurement Techniques, 2010
Toluene was measured using both a gas chromatographic system (GC), with a flame ionization detector (FID), and a proton transfer reaction-mass spectrometer (PTR-MS) at the AIRMAP atmospheric monitoring station Thompson Farm (THF) in rural Durham, NH ...
J. L. Ambrose, K. Haase, R. S. Russo, Y. Zhou, M. L. White, E. K. Frinak, C. Jordan, H. R. Mayne, R. Talbot, B. C. Sive   +9 more
doaj   +1 more source

Airborne formaldehyde measurements using PTR-MS: calibration, humidity dependence, inter-comparison and initial results [PDF]

Atmospheric Measurement Techniques, 2011
We present quantitative, fast time response measurements of formaldehyde (HCHO) onboard an aircraft using a Proton-Transfer-Reaction Mass-Spectrometry (PTR-MS) instrument.
C. Warneke, P. Veres, J. S. Holloway, J. Stutz, C. Tsai, S. Alvarez, B. Rappenglueck, F. C. Fehsenfeld, M. Graus, J. B. Gilman, J. A. de Gouw   +10 more
doaj   +1 more source

Presence of nanoplastics in rural and remote surface waters

Environmental Research Letters, 2022
It is now established that microplastics are a pervasive presence in aquatic and terrestrial ecosystems. The same is assumed to be true for nanoplastics but data are lacking due to technical difficulties associated with sample analysis. Here, we measured
Dušan Materić, Mike Peacock, Joshua Dean, Martyn Futter, Trofim Maximov, Filip Moldan, Thomas Röckmann, Rupert Holzinger   +7 more
doaj   +1 more source

Formaldehyde measurements by Proton transfer reaction – Mass Spectrometry (PTR-MS): correction for humidity effects [PDF]

Atmospheric Measurement Techniques, 2010
Formaldehyde measurements can provide useful information about photochemical activity in ambient air, given that HCHO is formed via numerous oxidation processes.
A. Vlasenko, A .M. Macdonald, S. J. Sjostedt, J. P. D. Abbatt   +3 more
doaj   +1 more source

Measurements of hydrogen sulfide (H₂S) using PTR-MS: calibration, humidity dependence, inter-comparison and results from field studies in an oil and gas production region [PDF]

Atmospheric Measurement Techniques, 2014
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
R. Li, C. Warneke, M. Graus, R. Field, F. Geiger, P. R. Veres, J. Soltis, S.-M. Li, S. M. Murphy, C. Sweeney, G. Pétron, J. M. Roberts, J. de Gouw   +12 more
doaj   +1 more source

Canopy-scale flux measurements and bottom-up emission estimates of volatile organic compounds from a mixed oak and hornbeam forest in northern Italy [PDF]

Atmospheric Chemistry and Physics, 2016
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.
W. J. F. Acton, S. Schallhart, B. Langford, A. Valach, A. Valach, P. Rantala, S. Fares, G. Carriero, R. Tillmann, S. J. Tomlinson, U. Dragosits, D. Gianelle, D. Gianelle, C. N. Hewitt, E. Nemitz   +14 more
doaj   +1 more source

Introducing the extended volatility range proton-transfer-reaction mass spectrometer (EVR PTR-MS) [PDF]

Atmospheric Measurement Techniques, 2021
Proton-transfer-reaction mass spectrometry (PTR-MS) is widely used in atmospheric sciences for measuring volatile organic compounds in real time. In the most widely used type of PTR-MS instruments, air is directly introduced into a chemical ionization ...
F. Piel, F. Piel, F. Piel, M. Müller, K. Winkler, J. Skytte af Sätra, J. Skytte af Sätra, A. Wisthaler, A. Wisthaler   +8 more
doaj   +1 more source

Comparison of advanced offline and in situ techniques of organic aerosol composition measurement during the CalNex campaign [PDF]

Atmospheric Measurement Techniques, 2015
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.
J. Timkovsky, A. W. H. Chan, T. Dorst, A. H. Goldstein, B. Oyama, R. Holzinger   +5 more
doaj   +1 more source

Oxygenated volatile organic compounds (VOCs) as significant but varied contributors to VOC emissions from vehicles [PDF]

Atmospheric Chemistry and Physics, 2022
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 ...
S. Wang, S. Wang, B. Yuan, B. Yuan, C. Wu, C. Wu, C. Wang, C. Wang, T. Li, T. Li, X. He, X. He, Y. Huangfu, Y. Huangfu, J. Qi, J. Qi, X.-B. Li, X.-B. Li, Q. Sha, Q. Sha, M. Zhu, M. Zhu, S. Lou, H. Wang, T. Karl, M. Graus, Z. Yuan, M. Shao, M. Shao   +28 more
doaj   +1 more source

SIFT-MS optimization for atmospheric trace gas measurements at varying humidity [PDF]

Atmospheric Measurement Techniques, 2020
As direct real-time analysis techniques, selective ion flow tube mass spectrometry (SIFT-MS) and proton-transfer reaction mass spectrometry (PTR-MS) provide online measurement of volatile organic compounds (VOCs).
A.-S. Lehnert, A.-S. Lehnert, T. Behrendt, A. Ruecker, G. Pohnert, S. E. Trumbore   +5 more
doaj   +1 more source