scholarly journals Real-time monitoring of volatile organic compounds using chemical ionization mass spectroscopy: Final report

1997 ◽  
Author(s):  
S.M. Thornberg ◽  
C.D. Mowry ◽  
M.R. Keenan ◽  
S.F.A. Bender ◽  
T. Owen
Keyword(s):  
Volatile Organic Compounds ◽  
Real Time ◽  
Organic Compounds ◽  
Mass Spectroscopy ◽  
Chemical Ionization ◽  
Final Report ◽  
Ionization Mass ◽  
Real Time Monitoring ◽  
Ionization Mass Spectroscopy ◽  
Volatile Organic

scholarly journals Development of a Combined Real Time Monitoring and Integration Analysis System for Volatile Organic Compounds (VOCs)

2010 ◽  
Vol 7 (12) ◽  
pp. 4100-4110 ◽  
Author(s):  
Kentaro Oka ◽  
Atsushi Iizuka ◽  
Yasuo Inoue ◽  
Atsushi Mizukoshi ◽  
Miyuki Noguchi ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Real Time ◽  
Organic Compounds ◽  
Real Time Monitoring ◽  
Volatile Organic ◽  
Analysis System ◽  
Integration Analysis

scholarly journals Using collision-induced dissociation to constrain sensitivity of ammonia chemical ionization mass spectrometry (NH<sub>4</sub><sup>+</sup> CIMS) to oxygenated volatile organic compounds

2019 ◽  
Vol 12 (3) ◽  
pp. 1861-1870 ◽  
Author(s):  
Alexander Zaytsev ◽  
Martin Breitenlechner ◽  
Abigail R. Koss ◽  
Christopher Y. Lim ◽  
James C. Rowe ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Mass Spectrometer ◽  
Chemical Ionization ◽  
Chemical Ionization Mass Spectrometry ◽  
Collision Induced Dissociation ◽  
Ionization Mass ◽  
Oxygenated Volatile Organic Compounds ◽  
Volatile Organic

Abstract. Chemical ionization mass spectrometry (CIMS) instruments routinely detect hundreds of oxidized organic compounds in the atmosphere. A major limitation of these instruments is the uncertainty in their sensitivity to many of the detected ions. We describe the development of a new high-resolution time-of-flight chemical ionization mass spectrometer that operates in one of two ionization modes: using either ammonium ion ligand-switching reactions such as for NH4+ CIMS or proton transfer reactions such as for proton-transfer-reaction mass spectrometer (PTR-MS). Switching between the modes can be done within 2 min. The NH4+ CIMS mode of the new instrument has sensitivities of up to 67 000 dcps ppbv−1 (duty-cycle-corrected ion counts per second per part per billion by volume) and detection limits between 1 and 60 pptv at 2σ for a 1 s integration time for numerous oxygenated volatile organic compounds. We present a mass spectrometric voltage scanning procedure based on collision-induced dissociation that allows us to determine the stability of ammonium-organic ions detected by the NH4+ CIMS instrument. Using this procedure, we can effectively constrain the sensitivity of the ammonia chemical ionization mass spectrometer to a wide range of detected oxidized volatile organic compounds for which no calibration standards exist. We demonstrate the application of this procedure by quantifying the composition of secondary organic aerosols in a series of laboratory experiments.

Real-Time Monitoring Distance Changes in Surfactant-Coated Au Nanoparticle Films upon Volatile Organic Compounds (VOCs)

2015 ◽  
Vol 119 (9) ◽  
pp. 5098-5106 ◽  
Author(s):  
M. C. Dalfovo ◽  
L. J. Giovanetti ◽  
J. M. Ramallo-López ◽  
R. C. Salvarezza ◽  
F. G. Requejo ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Real Time ◽  
Organic Compounds ◽  
Au Nanoparticle ◽  
Real Time Monitoring ◽  
Nanoparticle Films ◽  
Volatile Organic

A Wearable and Wireless Sensor System for Real-Time Monitoring of Toxic Environmental Volatile Organic Compounds

2009 ◽  
Vol 9 (12) ◽  
pp. 1734-1740 ◽  
Author(s):  
Francis Tsow ◽  
Erica Forzani ◽  
Anant Rai ◽  
Rui Wang ◽  
Ray Tsui ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Real Time ◽  
Organic Compounds ◽  
Sensor System ◽  
Wireless Sensor ◽  
Real Time Monitoring ◽  
Volatile Organic

scholarly journals Revisiting benzene cluster cations for the chemical ionization of dimethyl sulfide and select volatile organic compounds

2015 ◽  
Vol 8 (10) ◽  
pp. 10121-10157 ◽  
Author(s):  
M. J. Kim ◽  
M. C. Zoerb ◽  
N. R. Campbell ◽  
K. J. Zimmermann ◽  
B. W. Blomquist ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Mass Spectrometer ◽  
Chemical Ionization ◽  
Dimethyl Sulfide ◽  
Marine Boundary Layer ◽  
Ionization Mass ◽  
Select Group ◽  
Wide Range ◽  
Volatile Organic

Abstract. Benzene cluster cations were revisited as a sensitive and selective reagent ion for the chemical ionization of dimethyl sulfide (DMS) and a select group of volatile organic compounds (VOCs). Laboratory characterization was performed using both a new set of compounds (i.e. DMS, β-caryophyllene) as well as previously studied VOCs (i.e., isoprene, α-pinene). Using a field deployable chemical ionization time-of-flight mass spectrometer (CI-ToFMS), benzene cluster cations demonstrated high sensitivity (> 1 ncps ppt−1) to DMS, isoprene, and α-pinene standards. Parallel measurements conducted using a chemical-ionization quadrupole mass spectrometer, with a weaker electric field, demonstrated that ion-molecule reactions likely proceed through a combination of ligand-switching and direct charge transfer mechanisms. Laboratory tests suggest that benzene cluster cations may be suitable for the selective ionization of sesquiterpenes, where minimal fragmentation (< 25 %) was observed for the detection of β-caryophyllene, a bicyclic sesquiterpene. The field stability of benzene cluster cations using CI-ToFMS was examined in the marine boundary layer during the High Wind Gas Exchange Study (HiWinGS). The use of benzene cluster cation chemistry for the selective detection of DMS was validated against an atmospheric pressure ionization mass spectrometer. Measurements from the two instruments were highly correlated (R2=0.80) over a wide range of sampling conditions.

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