proton-transfer reaction
Airborne measurements of particulate organic matter by proton-transfer-reaction mass spectrometry (PTR-MS): a pilot study
... Abstract. Herein we report on the first successful airborne deployment of the CHemical Analysis of AeRosol ONline (CHARON) particle inlet which allowed us to measure the chemical composition of atmospheric submicrometer ...
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Measuring acetic and formic acid by proton-transfer-reaction mass spectrometry: sensitivity, humidity dependence, and quantifying interferences
... by proton-transfer- reaction mass spectrometry (PTR-MS), assess the under- lying fragmentation pathways and humidity dependencies, and present a new method for separating FA and AA from their main ...
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Sensitive detection of n-alkanes using a mixed ionization mode proton-transfer-reaction mass spectrometer
... Alkanes are among the most abundant compounds in ur- ban air (Amador-Muñoz et al., 2011). Biogenic sources may also emit n-alkanes and several studies have demonstrated that VOCs exhaled from the lungs (King et al., ...
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Measurement of atmospheric sesquiterpenes by proton transfer reaction-mass spectrometry (PTR-MS)
... the proton transfer reaction constants and to- tal transmission-corrected counts of all product ions showed good agreement ( ∼ 10%) with the reference values from the SQT standard generation ...
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OH clock determination by proton transfer reaction mass spectrometry at an environmental chamber
... Abstract. The hydroxyl free radical (OH) is the major oxi- dizing species in the lower atmosphere. Measuring the OH concentration is generally difficult and involves elaborate, expensive, custom-made experimental setups. ...
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Calibration and intercomparison of acetic acid measurements using proton-transfer-reaction mass spectrometry (PTR-MS)
... calibrated, proton-transfer-reaction mass spectrometry (PTR-MS) can be a valuable technique for fast response, ac- curate quantification of acetic acid in ambient ...
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Resolution of volatile fuel compound profiles from Ascocoryne sarcoides: a comparison by proton transfer reaction-mass spectrometry and solid phase microextraction gas chromatography-mass spectrometry
... a proton transfer reaction-mass spectrometry (PTR-MS) and at distinct time points with gas chromatography-mass spectrometry (GC-MS) using head space solid phase microextraction ...
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Standardised exhaled breath collection for the measurement of exhaled volatile organic compounds by proton transfer reaction mass spectrometry
... In view of the potential usefulness of VOCs as markers of lung disease we developed a simple method for their measurement using Proton Transfer Reaction Mass Spectrometry (PTR-MS) and cr[r] ...
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Development and characterization of a High-Temperature Proton-Transfer-Reaction Mass Spectrometer (HT-PTR-MS)
... High-Temperature Proton- Transfer-Reaction Mass Spectrometer (HT-PTR-MS) in which both the ion source and the ion drift tube can be contin- uously operated at temperatures up to 250 ◦ ...
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Formaldehyde measurements by Proton transfer reaction – Mass Spectrometry (PTR-MS): correction for humidity effects
... cesses. Proton transfer reaction mass spectrometry (PTR- MS) is an online technique that allows measurement of VOCs at the sub-ppbv level with good time ...
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Field measurements of methylglyoxal using proton transfer reaction time-of-flight mass spectrometry and comparison to the DNPH–HPLC–UV method
... A closer look at the blank signals measured at m/z 73 shows that this signal correlates with the total m/z 73 signal on some days (21–22 July, 26–27 July, 1–3 August), with R 2 factors ranging from 0.36 to 0.56. Lower ...
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Theoretical Study on the Self, Water assisted and Au to assisted Dimer Proton Transfer Reaction in the N Hydroxy Methylen Formamide
... reaction for the proton transfer when we use one water molecule. The DFT/B3LYP level, conduce to the small- est energy barrier, see 3.85 kcal/mol. This proves that the second water molecule addition ...
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Measurement of alkyl and multifunctional organic nitrates by proton-transfer-reaction mass spectrometry
... Hansel and Wisthaler (2000) have measured several PANs (PAN, MPAN and PPN) with PTR-MS and have reported a low detection limit (70 pptv, 15s integration time) and an overall accuracy of 15 %. It is worth noting that the ...
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Comparison of advanced offline and in situ techniques of organic aerosol composition measurement during the CalNex campaign
... In situ aerosol measurements were carried out with an aerosol sampling unit with two identical inlet systems at- tached to a proton-transfer-reaction time-of-flight mass spec- trometer (PTR-TOF-MS, ...
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PTR-QMS versus PTR-TOF comparison in a region with oil and natural gas extraction industry in the Uintah Basin in 2013
... with proton-transfer-reaction quadrupole mass spectrometry (PTR-QMS) have become a standard technique in atmo- spheric measurements on various platforms such as ground sites, ships and aircraft, ...
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Femtodynamics of double proton transfer reactions
... érisation reaction of approxim ately ...the proton tunnelling m echanism m ust be im p o rtan t in the reaction especially a t very low tem ...érisation reaction is less efficient in the d ...
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An extractive electrospray ionization time-of-flight mass spectrometer (EESI-TOF) for online measurement of atmospheric aerosol particles
... a proton transfer reaction time-of-flight mass spectrometer (CHARON-PTR) couples an aerodynamic particle lens with a heated inlet and a softer ionization scheme (via proton transfer ...
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Challenges associated with the sampling and analysis of organosulfur compounds in air using real-time PTR-ToF-MS and offline GC-FID
... approaches, proton-transfer reaction time-of- flight mass spectrometry (PTR-ToF-MS) and canister sam- pling coupled to gas chromatography with flame ionization detector (GC-FID), are compared for ...
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Development of a combined heart-cut and comprehensive two-dimensional gas chromatography system to extend the carbon range of volatile organic compounds analysis in a single instrument
... species with a wide range of functionalities. Approximately hourly field measurements were conducted at a remote marine atmospheric research station in Bachok, Malaysia. This region was shown to be influenced by clean ...
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Solvent free Synthesis of 1,4-dihydropyrano[2,3-c]pyrazole Derivatives
... long reaction time, effluent pollution, harsh reaction conditions, and tedious workup ...organic reaction is to carry out exclusively simple routes for the synthesis of different organic ...
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