A Laboratory Experiment To Measure Henry’s Law Constants of Volatile Organic Compounds with a Bubble Column and a Gas Chromatography Flame Ionization Detector (GC-FID)

2012 ◽  
Vol 90 (4) ◽  
pp. 495-499 ◽  
Author(s):  
Shan-Hu Lee ◽  
Souptik Mukherjee ◽  
Brittany Brewer ◽  
Raphael Ryan ◽  
Huan Yu ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Volatile Organic Compounds ◽  
Laboratory Experiment ◽  
Organic Compounds ◽  
Bubble Column ◽  
Flame Ionization Detector ◽  
Ionization Detector ◽  
Flame Ionization ◽  
Volatile Organic ◽  
Henry's Law Constants

scholarly journals Quantification of biogenic volatile organic compounds with a flame ionization detector using the effective carbon number concept

2012 ◽  
Vol 5 (8) ◽  
pp. 1911-1923 ◽  
Author(s):  
C. L. Faiola ◽  
M. H. Erickson ◽  
V. L. Fricaud ◽  
B. T. Jobson ◽  
T. M. VanReken
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Chromatographic Analysis ◽  
Carbon Number ◽  
Flame Ionization Detector ◽  
Biogenic Volatile Organic Compounds ◽  
Ionization Detector ◽  
Flame Ionization ◽  
Volatile Organic ◽  
The Difference

Abstract. Biogenic volatile organic compounds (BVOCs) are emitted into the atmosphere by plants and include isoprene, monoterpenes, sesquiterpenes, and their oxygenated derivatives. These BVOCs are among the principal factors influencing the oxidative capacity of the atmosphere in forested regions. BVOC emission rates are often measured by collecting samples onto adsorptive cartridges in the field and then transporting these samples to the laboratory for chromatographic analysis. One of the most commonly used detectors in chromatographic analysis is the flame ionization detector (FID). For quantitative analysis with an FID, relative response factors may be estimated using the effective carbon number (ECN) concept. The purpose of this study was to determine the ECN for a variety of terpenoid compounds to enable improved quantification of BVOC measurements. A dynamic dilution system was developed to make quantitative gas standards of VOCs with mixing ratios from 20–55 ppb. For each experiment using this system, one terpene standard was co-injected with an internal reference, n-octane, and analyzed via an automated cryofocusing system interfaced to a gas chromatograph flame ionization detector and mass spectrometer (GC/MS/FID). The ECNs of 16 compounds (14 BVOCs) were evaluated with this approach, with each test compound analyzed at least three times. The difference between the actual carbon number and measured ECN ranged from −24% to −2%. The difference between theoretical ECN and measured ECN ranged from −22% to 9%. Measured ECN values were within 10% of theoretical ECN values for most terpenoid compounds.

scholarly journals Quantification of biogenic volatile organic compounds with a flame ionization detector using the effective carbon number concept

2012 ◽  
Vol 5 (2) ◽  
pp. 2415-2447 ◽  
Author(s):  
C. L. Faiola ◽  
M. H. Erickson ◽  
V. L. Fricaud ◽  
B. T. Jobson ◽  
T. M. VanReken
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Chromatographic Analysis ◽  
Carbon Number ◽  
Flame Ionization Detector ◽  
Biogenic Volatile Organic Compounds ◽  
Ionization Detector ◽  
Flame Ionization ◽  
Volatile Organic ◽  
The Difference

Abstract. Biogenic volatile organic compounds (BVOCs) are emitted into the atmosphere by plants and include isoprene, monoterpenes, sesquiterpenes, and their oxygenated derivatives. These BVOCs are among the principal factors influencing the oxidative capacity of the atmosphere in forested regions. BVOC emission rates are often measured by collecting samples onto adsorptive cartridges in the field and then transporting these samples to the laboratory for chromatographic analysis. One of the most commonly used detectors in chromatographic analysis is the flame ionization detector (FID). For quantitative analysis with an FID, relative response factors may be estimated using the effective carbon number (ECN) concept. The purpose of this study was to determine the ECN for a variety of terpenoid compounds to enable improved quantification of BVOC measurements. A dynamic dilution system was developed to make quantitative gas standards of VOCs with mixing ratios from 20–55 ppb. For each experiment using this system, one terpene standard was co-injected with an internal reference, n-octane, and analyzed via an automated cryofocusing system interfaced to a gas chromatograph flame ionization detector and mass spectrometer (GC/MS/FID). The ECNs of 16 compounds (14 BVOCs) were evaluated with this approach, with each test compound analyzed at least three times. The difference between the actual carbon number and measured ECN ranged from −24% to −2%. The difference between theoretical ECN and measured ECN ranged from −22% to 9%. Measured ECN values were within 10% of theoretical ECN values for most terpenoid compounds.

scholarly journals Comprehensive two-dimensional gas chromatography (GC×GC) measurements of volatile organic compounds in the atmosphere

2003 ◽  
Vol 3 (1) ◽  
pp. 1139-1181 ◽  
Author(s):  
X. Xu ◽  
L. L. P. van Stee ◽  
J. Williams ◽  
J. Beens ◽  
M. Adahchour ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Retention Indices ◽  
Two Dimensional ◽  
Ground Station ◽  
Flame Ionization ◽  
Peak Identification ◽  
Volatile Organic

Abstract. During the MINOS campaign in August 2001 comprehensive two-dimensional gas chromatography (GC×GC) was applied to the in situ measurements of atmospheric volatile organic compounds (VOCs) at the Finokalia ground station, Crete. The measurement system employs a thermal desorption unit for on-line sampling and injection, and a GCxGC separation system equipped with a flame ionization detector (FID) for detection. The system was optimized to resolve C7−C14 organic components. Two-dimensional chromatograms from measurements of Finokalia air samples show several hundred well-separated peaks. To facilitate peak identification, cartridge samples collected at Finokalia were analyzed using the same GC×GC system coupled with a time-of-flight mass spectrometer (TOF-MS). The resulting mass spectra were deconvoluted and compared to spectra from a database for tentative peak identification. About 650 peaks have been identified in the two-dimensional plane, with significant signal/noise ratios (>100) and high spectra similarities (>800). By comparing observed retention indices with those found in the literature, 235 of the identifications have been confirmed. 150 of the confirmed compounds show up in the C7−C14 range of the chromatogram from the in situ measurement. However, at least as many peaks remain unidentified. For quantification of the GCxGC measurements, peak volumes of measured compounds have been integrated and externally calibrated using a standard gas mixture.

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