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  • Gas chromatography  (7)
  • Springer  (7)
  • Annual Reviews
  • Wiley
  • 1980-1984  (5)
  • 1975-1979  (2)
  • 1983  (5)
  • 1979  (2)
Collection
Keywords
Publisher
Years
  • 1980-1984  (5)
  • 1975-1979  (2)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Relationship between the average molecular polarizabilities of polycyclic aromatic hydrocarbons and their retention indices determined on various stationary phases (1983)
    Springer
    Chromatographia 17 (1983), S. 300-302 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Average molecular polarizability ; Retention index ; Polycyclic aromatic hydrocarbons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The Kováts retention indices of 10 polycyclic aromatic hydrocarbons were determined on SE-30, OV-101, SE-52, OV-7 and OV-17 stationary phases. A significant correlation has been found between the retention indices and the average molecular polarizabilities of the analyzed substances. Equations were derived for the direct determination of the average molecular polarizabilities from the retention index values. The influence of the temperature on this relationship is also indicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02270661
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  • 2
    Electronic Resource
    Electronic Resource
    A modified procedure for acid-catalyzed esterification with isopropanol (1979)
    Springer
    Chromatographia 12 (1979), S. 168-170 
    Details
    ISSN: 1612-1112
    Keywords: Acid catalyzed esterification ; Amino acids ; Fatty acids ; Gas chromatography ; Isopropyl esters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Acid-catalyzed esterification of carboxyl groups with acetyl chloride in isopropanol is investigated. Yields are equivalent to those obtained with reagent prepared conventionally by bubbling gaseous hydrogen chloride into isopropanol. The preparation of the former reagent is less time consuming and no special equipment is needed. The procedure is applicable for other alcohols as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02314873
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  • 3
    Electronic Resource
    Electronic Resource
    Porous polymers coated with stationary phases. Contribution of the support to retention behaviour in gas chromatography (1979)
    Springer
    Chromatographia 12 (1979), S. 725-732 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Porous polymer supports ; Retention behaviour-effect of support
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The gas chromatographic behaviour of a series of compounds of different polarity on columns of Ethofat 60/25 on Chromosorb P HMDS (an inactive support) and Chromosorb 101 (an active support) was investigated. To observe how the support influences the chromatographic process, we separated the contribution to the retention volume of the interaction phenomena associated with the stationary phase, the solid support and the corresponding interfaces. In some cases the Chromosorb 101 exerts an influence on the process even with high percentages (〉10%) of stationary phase. The values of the experimental partition constants of a series of compounds and the factors that contribute to adsorption on these columns are calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262451
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  • 4
    Electronic Resource
    Electronic Resource
    Simple method for the rapid analysis of natural gas by gas chromatography (1983)
    Springer
    Chromatographia 17 (1983), S. 44-46 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Natural gas analysis ; Poropak N
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A simple gas chromatographic method is described for the rapid analysis of natural gas using thermal conductivity detectors and programmed-temperature operation of a single Poropak N column. The method permits the determination of nitrogen, carbon dioxide and hydrocarbons containing one to seven carbon atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02265109
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  • 5
    Electronic Resource
    Electronic Resource
    Open tubular columns prepared with very thick liquid phase film II. Investigations on column efficiency (1983)
    Springer
    Chromatographia 17 (1983), S. 560-569 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Open-tubular (capillary) columns ; Immobilized liquid phases ; Thick-film columns ; GC-FTIR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The performance of a column prepared with an immobilized (chemically bonded) methylsilicone phase having a film thickness of 5μm is investigated in detail. Due to their high sample capacity, such columns are particularly useful when directly coupling gas chromatography with spectroscopic techniques such as Fourier-transform infrared spectroscopy. Thick-film columns can even be used with thermal conductivity detectors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261920
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  • 6
    Electronic Resource
    Electronic Resource
    A single-column gas chromatographic method for the analysis of gasolines containing oxygenated compounds (1983)
    Springer
    Chromatographia 17 (1983), S. 65-69 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Oxygenates ; Fused-silica capillary columns
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A method of analysing gasolines that contain oxygenates has been developed. The method uses a single fusedsilica capillary column and gives quantitative data for the oxygenates and the hydrocarbons in one analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259341
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  • 7
    Electronic Resource
    Electronic Resource
    Evaluation of the enrichment factor in gas chromatographic preconcentration of impurities (1983)
    Springer
    Chromatographia 17 (1983), S. 75-78 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Trace analysis ; GC-concentration ; Enrichment factor ; Theoretical evaluation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Based on gas chromatographic retention data obtained on a given adsorbent and at a given trap efficiency at different temperatures new equations are proposed for the evaluation of the enrichment factor. These equations are suitable under various preconcentration conditions such as: equilibrium saturation, complete trapping and permissible losses. Compared to known expressions for the evaluation of the enrichment factor the equations suggested consider the band broadening of the impurity in a trap causing a loss of the substance at the adsorption stage and dilution of the sample during desorption when the desorbed impurities are directed into the gas chromatographic column without intermediate freezing out in an graphic column without intermediate freezing out in an empty tube. The new equations may be used to select the optimum preconcentration conditions providing the necessary sensitivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259343
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