Utilization of the Sadtler standard RI system in micropollution analyses

Weber, Louis

doi:10.1002/jhrc.1240090806

Cited by 22 publications

(3 citation statements)

References 4 publications

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“…2a), but there are some differences between both chromatograms. On the TIC chromatogram there seems to (2001); (2) Hayes and Pitzer (1985); (3) prediction using the method of Zenkevich (1998); (4) HaagenSmit Laboratory (1997); (5) Laub and Purmell (1988); (6) Lubeck and Sutton (1984); (7) Helmig et al (1996); (8) Bermejo et al (1987); (9) Andrade et al (2000); (10) (2000); (15) Madruga and Mottram (1998); (16) Weber (1986) be a band 0.4 s above the lowermost band (i.e. the alkane band).…”

Section: Gc×gc Chromatogramsmentioning

confidence: 99%

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

et al. 2003

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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 GC×GC separation system equipped with a flame ionization detector (FID) for detection. The system was optimized to resolve C 7 − C 14 organic components. Two-dimensional chromatograms from measurements of Finokalia air samples show several hundred wellseparated 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 C 7 − C 14 range of the chromatogram from the in situ measurement. However, at least as many peaks remain unidentified. For quantification of the GC×GC measurements, peak volumes of measured compounds have been integrated and externally calibrated using a standard gas mixture.

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Section: Gc×gc Chromatogramsmentioning

confidence: 99%

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

et al. 2003

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“…(5.38) was demonstrated with experimentally found (T Char ,q Char ) pairs for about 200 solutes and two types of stationary phase polymers [11,64,71]. The database was compiled from published thermodynamic data [51][52][53][54][55][56][57][58][59][60][61][62][64][65][66] and from experimental results developed by the software vendor [74]. A large database of thermodynamic parameters of solute-liquid interaction in GC is compiled in commercial Pro ezGC software [73] covering more than 3000 soluteseach in several liquid polymers widely used for making stationary phases in GC columns [74].…”

Section: Fixed Dimensionless Film Thicknessmentioning

confidence: 80%

Solute–Liquid Interaction in Gas Chromatography

Blumberg¹

2010

Temperature‐Programmed Gas Chromatography

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Solute separation in GC results from the difference in their migration velocities in a column. That difference, in turn, is a result of the difference in the solute interaction with the columns stationary phase. The stronger is the interaction, the lower is the migration velocity. Depending on the stationary phase typesolid or liquida solute can be adsorbed on the solid surface, or it can be absorbed by the liquid (dissolved in it). This chapter focuses on the GC-related parameters of interaction of solutes with liquid stationary phases. Distribution Constant and Retention FactorConsider a layer of a liquid (the liquid phase) and a layer of an inert gas (the gas phase) that are in contact with each other, Figure 5.1. In this chapter, the layers represent organic liquid polymer film and a carrier gas in a capillary (open tubular) column, respectively, Figure 2.1a. Suppose that a solute was added to the gas, and the entire three-component system was sealed. A fraction of the solute added to the gas can be absorbed by the liquid (dissolved in it). Of the primary concern for this chapter is a chromatographically meaningful description of equilibrium of a solute solvationevaporation (solvation in the liquid and evaporation into the gas) or, in broader terms, equilibrium of a solute-liquid interaction. The equilibrium takes place at a certain distribution of a solute between the gas and the liquid. The gas is inert and has no effect on the equilibrium distribution of a solute between the two phases. This means that replacement of one gas with another has no effect on the equilibrium.The equilibrium distribution of a solute between a gas and a liquid, Figure 5.1, can be described by the distribution constant [1] (partition coefficient [2-8]), K c , defined as [2][3][4][5][6][7]9] K c ¼ C sol;f C sol;g ð5:1Þwhere C sol,g and C sol,f are concentrations (mass per volume, mole per volume, and so forth) of the solute in a liquid film and a gas, respectively.Temperature-Programmed Gas Chromatography. Leonid M. Blumberg

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“…2a), but there are some differences between both chromatograms. On the TIC chromatogram there seems to Hayes and Pitzer (1985); (3) prediction using the method of Zenkevich ( 1998 16) Weber (1986) be a band 0.4 s above the lowermost band (i.e. the alkane band).…”

Section: Gc×gc Chromatogramsmentioning

confidence: 99%

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

Xu¹,

Stee²,

Williams³

et al. 2003

Preprint

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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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Utilization of the Sadtler standard RI system in micropollution analyses

Cited by 22 publications

References 4 publications

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

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

Solute–Liquid Interaction in Gas Chromatography

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

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