Comparison between theoretical and experimental sampling efficiencies on Tenax GC

Straeten, Dominique Van Der; Langenhove, Herman Van; Schamp, N.

doi:10.1016/0021-9673(85)80026-1

Cited by 26 publications

(15 citation statements)

References 39 publications

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“…In the literature, many different definitions of BTV are available. BTV is expressed by collection efficiency, the retention volume for the adsorbate versus adsorbent combination, and the number of theoretical plates of the adsorbent [3,[9][10][11]. In this work the elution model for determination of BTV is used and BTV is defined as net retention volume of adsorbate on 1 g of adsorbent at given temperature.…”

Section: Introductionmentioning

confidence: 99%

Breakthrough characteristics of volatile organic compounds in the −10 to +170°C temperature range on Tenax TA determined by microtrap technology

Kroupa

Dewulf

Langenhove

et al. 2004

Journal of Chromatography A

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Section: Introductionmentioning

confidence: 99%

Breakthrough characteristics of volatile organic compounds in the −10 to +170°C temperature range on Tenax TA determined by microtrap technology

Kroupa

Dewulf

Langenhove

et al. 2004

Journal of Chromatography A

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“…In the early applications of solid adsorbents this parameter was determined by means of elution chromatography and was calculated as a function of the retention volume and the number of theoretical plates in a chromatographic system using the adsorbent as the stationary phase (17,18). As a result, extensive accounts of retention volumes have appeared as guidelines in the use of adsorption systems (19,20).…”

Section: Introductionmentioning

confidence: 99%

An Investigation of the Adsorption of C₅-C₁₂ Hydrocarbons in the ppmv and ppbv Ranges on Carbotrap B

Foley

Gonzalez-Flesca

Zdanevitch

et al. 2001

Environ. Sci. Technol.

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The effects of concentration and temperature on the breakthrough volumes (Vb) of 23 volatile organic compounds on Carbotrap B have been determined using the frontal chromatography method. From the measured Vb, original isotherms have been produced and adsorption parameters based on the Langmuir, Freundlich, and Dubinin-Polyani adsorption models have been calculated. The calculated adsorption parameters describe the behavior of these VOC on Carbotrap B under the experimental conditions and are useful data for VOC sampling applications including adsorption modeling of pumped and diffusive sampling. Each of the adsorption models give similar results and are in good agreement with the experimental data in the ppmv concentration range. It will be shown that contrary to previous assumptions the Langmuir adsorption parameters obtained at ppmv concentrations cannot be used to predict Vb at ppbv concentrations and the calculated parameter mmax does not represent the maximum adsorbent capacity. The Freundlich and Dubinin-Polyani models are shown to be more successful in describing the adsorption behavior of the VOC at ppbv levels where Vb is independent of concentration. The isosteric heats of adsorption (-delta Hst) for some of the compounds have been determined using the Van't Hoff equation which can be used to predict the effect of temperature on Vb.

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“…The trapping of volatile analytes using solid phase traps is always more problematic, and toward that end, King and Taylor [20] have determined breakthrough volumes from physicochemical chromatographic measurements using low pressure carbon dioxide as an eluent. There is also a considerable literature from the environmental analysis community [21,22] with regards to the use of sorbents to isolate volatile and semivolatile compounds from the atmosphere, to aid the analyst in establishing optimum conditions for sorbent trapping relevent to SFE. Such sorbate breakthrough volume studies [23,24] are pertinent to minimizing analyte losses during trapping of analytes in SFE; although there is paucity of such data for a carbon dioxide atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Theoretical optimization of analyte collection in analytical supercritical fluid extraction

King

Zhang

2000

Chromatographia

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SummaryOptimizing the extracted analyte collection step in analytical supercritical fluid extraction (SFE) is of key importance in achieving high analyte recoveries and extraction efficiencies. Whereas the extraction step in SFE has been well characterized both theoretically and experimentally; the analyte collection step after SFE has few theoretical guidelines, aside from a few empirical studies which have appeared in the literature. In this study, we have applied several theoretical approaches using experimental data to optimize analyte trapping efficiency in SFE. A vapour-liquid equilibrium model has been formulated to predict the trapping efficiency for extracted solute collection in a open collection vessel. Secondly, a simple solution thermodynamic model for predicting solute (analyte) activity coefficients in various trapping solvents has been shown to have utility in predicting collection efficiencies. Finally, effective trapping efficiency after SFE using sorbent media is related to the extent of analyte breakthrough on the sorbent-filled trap after depressurization of supercritical fluid. Using experimental data determined via physico-chemical gas chromatographic measurements (i. e., specific retention volumes), we have shown the relationship between analyte breakthrough volume off of the trapping sorbent and volume ofdepressurized fluid through the collection trap. The above theoretical guidlines should prove of value to analysts in designing and optimizing the best conditions for trapping analytes after extraction via analytical SFE.Names are necessary to report factually on available data; however the USDA neither guarantees nor warrants the standard of the product, and the use of the name by USDA implies no approval of the products to the exclusion of others that may also be suitable.

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Comparison between theoretical and experimental sampling efficiencies on Tenax GC

Cited by 26 publications

References 39 publications

Breakthrough characteristics of volatile organic compounds in the −10 to +170°C temperature range on Tenax TA determined by microtrap technology

Breakthrough characteristics of volatile organic compounds in the −10 to +170°C temperature range on Tenax TA determined by microtrap technology

An Investigation of the Adsorption of C₅-C₁₂ Hydrocarbons in the ppmv and ppbv Ranges on Carbotrap B

Theoretical optimization of analyte collection in analytical supercritical fluid extraction

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Comparison between theoretical and experimental sampling efficiencies on Tenax GC

Cited by 26 publications

References 39 publications

Breakthrough characteristics of volatile organic compounds in the −10 to +170°C temperature range on Tenax TA determined by microtrap technology

Breakthrough characteristics of volatile organic compounds in the −10 to +170°C temperature range on Tenax TA determined by microtrap technology

An Investigation of the Adsorption of C5-C12 Hydrocarbons in the ppmv and ppbv Ranges on Carbotrap B

Theoretical optimization of analyte collection in analytical supercritical fluid extraction

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An Investigation of the Adsorption of C₅-C₁₂ Hydrocarbons in the ppmv and ppbv Ranges on Carbotrap B