Supplementary material to "Gas-Chromatography using ice coated fused silica-columns: Study of adsorption of sulfur dioxide on water-ice"

2017 ◽  
Author(s):  
Stefan Langenberg ◽  
Ulrich Schurath
Keyword(s):  
Gas Chromatography ◽  
Sulfur Dioxide ◽  
Fused Silica ◽  
Water Ice ◽  
Supplementary Material

scholarly journals Gas chromatography using ice-coated fused silica columns: study of adsorption of sulfur dioxide on water ice

2018 ◽  
Vol 18 (10) ◽  
pp. 7527-7537 ◽  
Author(s):  
Stefan Langenberg ◽  
Ulrich Schurath
Keyword(s):  
Gas Chromatography ◽  
Sulfur Dioxide ◽  
Vertical Displacement ◽  
Fused Silica ◽  
Water Ice ◽  
Temperature Range ◽  
Reaction With Water ◽  
The Impact ◽  
Peak Retention Time ◽  
Established Technique

Abstract. The well established technique of gas chromatography is used to investigate interactions of sulfur dioxide with a crystalline ice film in a fused silica wide bore column. Peak shape analysis of SO2 chromatograms measured in the temperature range 205–265 K is applied to extract parameters describing a combination of three processes: (i) physisorption of SO2 at the surface, (ii) dissociative reaction with water and (iii) slow uptake into bulk ice. Process (ii) is described by a dissociative Langmuir isotherm. The pertinent monolayer saturation capacity is found to increase with temperature. The impact of process (iii) on SO2 peak retention time is found to be negligible under our experimental conditions.By analyzing binary chromatograms of hydrophobic n-hexane and hydrophilic acetone, the premelt surface layer is investigated in the temperature range 221–263 K, possibly giving rise to irregular adsorption. Both temperature dependencies fit simple van't Hoff equations as expected for process (i), implying that irregular adsorption of acetone is negligible in the investigated temperature range. Adsorption enthalpies of −45 ± 5 and −23±2 kJ mol−1 are obtained for acetone and n-hexane.The motivation of our study was to assess the vertical displacement of SO2 and acetone in the wake of aircraft by adsorption on ice particles and their subsequent sedimentation. Our results suggest that this transport mechanism is negligible.

scholarly journals Gas-Chromatography using ice coated fused silica-columns: Study of adsorption of sulfur dioxide on water-ice

2017 ◽  
Author(s):  
Stefan Langenberg ◽  
Ulrich Schurath
Keyword(s):  
Gas Chromatography ◽  
Sulfur Dioxide ◽  
Vertical Displacement ◽  
Fused Silica ◽  
Experimental Conditions ◽  
Water Ice ◽  
Temperature Range ◽  
Reaction With Water ◽  
The Impact ◽  
Peak Retention Time

Abstract. The well-established technique of gas chromatography is used to investigate interactions of sulfur dioxide with a crystalline ice film in a fused silica wide-bore column. Peak shape analysis of SO2 chromatograms measured in the temperature range 205–265 K is applied to extract parameters describing a combination of three processes: (i) physisorption of SO2 at the surface; (ii) dissociative reaction with water; (iii) slow uptake into bulk ice. Process (ii) is described by a dissociative Langmuir isotherm. The pertinent monolayer saturation capacity is found to increase with temperature. The impact of process (iii) on SO2 peak retention time is found to be negligible under our experimental conditions. By analyzing binary chromatograms of hydrophobic n-hexane and hydrophilic acetone, the premelt surface layer is probed in the temperature range 221–263 K possibly giving rise to irregular adsorption. Both temperature dependencies fit simple van't Hoff equations as expected for process (i), implying that irregular adsorption of acetone is negligible in the probed temperature range. Adsorption enthalpies of −45 ± 5 kJ mol−1 and −23 ± 2 kJ mol−1 are obtained for acetone and n-hexane. Our study was motivated to assess the vertical displacement of SO2 and acetone in the wake of aircraft by adsorption on ice particles and their subsequent sedimentation. Our results suggest that this transport mechanism is negligible.

Determination of volatile alcohols and acetone in serum by non-polar capillary gas chromatography after direct sample injection.

1984 ◽  
Vol 30 (10) ◽  
pp. 1672-1674 ◽  
Author(s):  
N B Smith
Keyword(s):  
Gas Chromatography ◽  
Capillary Gas Chromatography ◽  
Capillary Column ◽  
Internal Standard ◽  
Fused Silica ◽  
Gas Chromatograph ◽  
Ionization Detector ◽  
Flame Ionization ◽  
Split Ratio

Abstract In this method for detection and quantification of volatile alcohols by capillary gas chromatography, the serum sample is deproteinized, then directly injected into the gas chromatograph with 1-propanol as the internal standard. The capillary column is a 30-m bonded methylsilicone-coated, fused-silica column. With helium as the carrier gas, the injector inlet is set at a split ratio of 1/30 and the average linear velocity in the column is 25 cm/s. Injector and flame-ionization detector temperatures are 280 degrees C, oven temperature 35 degrees C. Chromatography time is less than 3 min.

Evaluation of Capillary Gas Chromatography for Multicomponent Drug Analysis

1986 ◽  
Vol 69 (5) ◽  
pp. 811-813
Author(s):  
Don W Thompson
Keyword(s):  
Gas Chromatography ◽  
Capillary Gas Chromatography ◽  
Drug Analysis ◽  
Fused Silica ◽  
Pharmacological Activities ◽  
Over The Counter ◽  
Silica Column ◽  
Drug Mixtures ◽  
Bonded Phase ◽  
Glass Column

Abstract Capillary gas chromatography is evaluated for multicomponent drug analysis. A 0.32 mm id × 30 m fused silica column and a 0.75 mm id × 30 m borosilicate glass column (both with OV-1 bonded phase) are investigated. Retention times (relative to caffeine) are presented for 39 drug components representing a variety of chemical classes and pharmacological activities. Reproducibility data are presented for both isothermal and programmed temperature runs on selected drug mixtures. Recovery data are provided for 2 multicomponent drug mixtures prepared to approximate over-the-counter antihistaminic and antitussive preparations.

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