scholarly journals AR1.3 - Real time Proton Transfer Reaction and Electronic Nose simultaneous measurements on same samples

2018 ◽  
Author(s):  
C. Di Natale ◽  
R. Capuano ◽  
L. Quercia ◽  
A. Catini ◽  
F. Biasioli ◽  
...  
Keyword(s):  
Proton Transfer ◽  
Real Time ◽  
Electronic Nose ◽  
Transfer Reaction ◽  
Proton Transfer Reaction ◽  
Simultaneous Measurements

On-line assessment of oil quality during deep frying using an electronic nose and proton transfer reaction mass spectrometry

Food Control ◽  
2021 ◽  
Vol 121 ◽  
pp. 107659
Author(s):  
Tomasz Majchrzak ◽  
Wojciech Wojnowski ◽  
Agnieszka Głowacz-Różyńska ◽  
Andrzej Wasik
Keyword(s):  
Mass Spectrometry ◽  
Proton Transfer ◽  
Electronic Nose ◽  
Transfer Reaction ◽  
Oil Quality ◽  
Proton Transfer Reaction ◽  
Reaction Mass ◽  
Deep Frying ◽  
On Line

The applicability of proton transfer reaction-mass spectrometry (PTR-MS) for determination of isocyanic acid (ICA) in work room atmospheres

2014 ◽  
Vol 16 (10) ◽  
pp. 2423-2431 ◽  
Author(s):  
Mikolaj Jan Jankowski ◽  
Raymond Olsen ◽  
Claus Jørgen Nielsen ◽  
Yngvar Thomassen ◽  
Paal Molander
Keyword(s):  
Mass Spectrometry ◽  
Proton Transfer ◽  
Real Time ◽  
Mass Spectrometer ◽  
Transfer Reaction ◽  
Proton Transfer Reaction ◽  
Reaction Mass ◽  
Isocyanic Acid

This study presents a real-time method to quantitatively determine isocyanic acid (ICA) in workroom air using a proton transfer reaction-mass spectrometer (PTR-MS).

scholarly journals Monitoring the BTEX Volatiles during 3D Printing with Acrylonitrile Butadiene Styrene (ABS) Using Electronic Nose and Proton Transfer Reaction Mass Spectrometry

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5531
Author(s):  
Wojciech Wojnowski ◽  
Kaja Kalinowska ◽  
Jacek Gębicki ◽  
Bożena Zabiegała
Keyword(s):  
Proton Transfer ◽  
Electronic Nose ◽  
Transfer Reaction ◽  
Electrochemical Sensors ◽  
Acrylonitrile Butadiene Styrene ◽  
Proton Transfer Reaction ◽  
Reaction Mass ◽  
Fused Deposition ◽  
Btex Compounds ◽  
Butadiene Styrene

We describe a concept study in which the changes of concentration of benzene, toluene, ethylbenzene, and xylene (BTEX) compounds and styrene within a 3D printer enclosure during printing with different acrylonitrile butadiene styrene (ABS) filaments were monitored in real-time using a proton transfer reaction mass spectrometer and an electronic nose. The quantitative data on the concentration of the BTEX compounds, in particular the concentration of carcinogenic benzene, were then used as reference values for assessing the applicability of an array of low-cost electrochemical sensors in monitoring the exposure of the users of consumer-grade fused deposition modelling 3D printers to potentially harmful volatiles. Using multivariate statistical analysis and machine learning, it was possible to determine whether a set threshold limit value for the concentration of BTEX was exceeded with a 0.96 classification accuracy and within a timeframe of 5 min based on the responses of the chemical sensors.

scholarly journals Introducing the extended volatility range proton-transfer-reaction mass spectrometer (EVR PTR-MS)

2021 ◽  
Vol 14 (2) ◽  
pp. 1355-1363
Author(s):  
Felix Piel ◽  
Markus Müller ◽  
Klaus Winkler ◽  
Jenny Skytte af Sätra ◽  
Armin Wisthaler
Keyword(s):  
Proton Transfer ◽  
Real Time ◽  
Chemical Ionization ◽  
Transfer Reaction ◽  
Proton Transfer Reaction ◽  
Reaction Mass ◽  
Time Response ◽  
Signal Decay ◽  
Decay Times ◽  
Response Performance

Abstract. 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 reactor via an inlet capillary system. The reactor has a volumetric exchange time of ∼0.1 s, enabling PTR-MS analyzers to measure at a frequency of 10 Hz. The time response does, however, deteriorate if low-volatility analytes interact with surfaces in the inlet or in the instrument. Herein, we present the extended volatility range (EVR) PTR-MS instrument which mitigates this issue. In the EVR configuration, inlet capillaries are made of passivated stainless steel, and all wetted metal parts in the chemical ionization reactor are surface-passivated with a functionalized hydrogenated amorphous silicon coating. Heating the entire setup (up to 120 ∘C) further improves the time-response performance. We carried out time-response performance tests on a set of 29 analytes having saturation mass concentrations C0 in the range between 10−3 and 105 µg m−3. The 1/e-signal decay times after instant removal of the analyte from the sampling flow were between 0.2 and 90 s for gaseous analytes. We also tested the EVR PTR-MS instrument in combination with the chemical analysis of aerosols online (CHARON) particle inlet, and 1/e-signal decay times were in the range between 5 and 35 s for particulate analytes. We show on a set of example compounds that the time-response performance of the EVR PTR-MS instrument is comparable to that of the fastest flow tube chemical ionization mass spectrometers that are currently in use. The fast time response can be used for rapid (∼1 min equilibration time) switching between gas and particle measurements. The CHARON EVR PTR-MS instrument can thus be used for real-time monitoring of both gaseous and particulate organics in the atmosphere. Finally, we show that the CHARON EVR PTR-MS instrument also rapidly detects highly oxygenated species (with up to eight oxygen atoms) in particles formed by limonene ozonolysis.

scholarly journals Introducing the Extended Volatility Range Proton-Transfer-Reaction Mass Spectrometer (EVR PTR-MS)

2020 ◽  
Author(s):  
Felix Piel ◽  
Markus Müller ◽  
Klaus Winkler ◽  
Jenny Skytte af Sätra ◽  
Armin Wisthaler
Keyword(s):  
Proton Transfer ◽  
Real Time ◽  
Chemical Ionization ◽  
Transfer Reaction ◽  
Proton Transfer Reaction ◽  
Reaction Mass ◽  
Time Response ◽  
Signal Decay ◽  
Decay Times ◽  
Response Performance

Abstract. 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 reactor via an inlet capillary system. The reactor has a volumetric exchange time of ~ 0.1 s enabling PTR-MS analyzers to measure at a frequency of 10 Hz. The time response does, however, deteriorate if low-volatility analytes interact with surfaces in the inlet or in the instrument. Herein, we present the “Extended Volatility Range” (EVR) PTR-MS instrument which mitigates this issue. In the EVR configuration, inlet capillaries are made of passivated stainless steel and all wetted metal parts in the chemical ionization reactor are surface-passivated with a functionalized hydrogenated amorphous silicon coating. Heating the entire set-up to 120 °C further improves the time-response performance. We carried out time-response performance tests on a set of 29 analytes having saturation mass concentrations C0 in the range between 10−3 and 105 µg m−3. 1/e-signal decay times after instant removal of the analyte from the sampling flow were between 0.2 and 90 s for gaseous analytes. We also tested the EVR PTR-MS instrument in combination with the CHARON particle inlet, and 1/e-signal decay times were in the range between 5 and 35 s for particulate analytes. We show on a set of exemplary compounds that the time-response performance of the EVR PTR-MS instrument is comparable to that of fastest flow tube chemical ionization mass spectrometers that are currently in use. The fast time response can be used for rapid (~ 1 min equilibration time) switching between gas and particle measurements. The CHARON EVR PTR-MS instrument can thus be used for real-time monitoring of both gaseous and particulate organics in the atmosphere. Finally, we show that the CHARON EVR PTR-MS instrument is capable of detecting highly oxygenated species (with up to eight oxygen atoms) in particles formed by limonene ozonolysis.

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