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  • Artikel  (32)
  • Gas chromatography  (32)
  • Springer  (32)
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  • 2015-2019
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  • 1980-1984  (32)
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  • 1982  (32)
  • Chemie und Pharmazie  (32)
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  • Springer  (32)
  • American Chemical Society (ACS)
  • American Geophysical Union
  • American Meteorological Society
  • National Academy of Sciences
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  • 2015-2019
  • 2005-2009
  • 1980-1984  (32)
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  • Chemie und Pharmazie  (32)
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  • Elektrotechnik, Elektronik, Nachrichtentechnik
  • 1
    Digitale Medien
    Digitale Medien
    Chemically modified teflon capillary columns for gas chromatography II. Solid surface effects in direct coated columns (1982)
    Springer
    Chromatographia 15 (1982), S. 641-644 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Teflon capillary columns ; Chemically modified teflon ; Gas chromatography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary The preparation of teflon capillary columns employing direct coating of the stationary phase to the chemically modified teflon surface and the role of the chemically modified teflon in the separation mechanism are described. Two types of contributions from the modified teflon have been observed: nonspecific adsorption of the carbon surface and specific interactions of polar groups in the carbon skeleton. The use of polar liquid phases can eliminate adsorption due to the presence of polar groups in the modified teflon.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02279491
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  • 2
    Digitale Medien
    Digitale Medien
    Derivatization of amines with chloroformate esters for gas chromatographic analysis (1982)
    Springer
    Chromatographia 16 (1982), S. 60-62 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Amines ; Derivatization ; Chloroformate esters
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary The gas chromatographic analysis of amines after conversion to electron capture sensitive carbamates in two-phase systems has been studied. Hydrophilic compounds, for instance methylamine, are reacted with 2,2,2-trichloro-tert. butyl chloroformate. Quantitation below 10−7 M can be made by thermionic or electron capture detection. A hydrophobic amine, namely N,N-dimethyl-n-octylamine, was derivatized with 2,4,6-tribromophenyl chloroformate with addition of iodide ion to the aqueous phase. The favorable effect of iodide ion as well as the choice of pH and chloroformate ester is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02258870
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  • 3
    Digitale Medien
    Digitale Medien
    Gas chromatography in open rectangular channels with large aspect ratios (1982)
    Springer
    Chromatographia 16 (1982), S. 98-102 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Rectangular channel ; Efficiency ; Capacity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary Gas chromatographic experiments have been performed in a truly rectangular channel with a 60∶1 cross-sectional aspect ratio, constructed according to the field-flow fractionation technology. It is shown that the peak broadening is controlled by the thickness of the channel while the maximum load is determined by the largest cross-sectional dimension. However, even with its elongated configuration, the side walls contribute significantly to the band broadening of solutes with a high diffusivity. Good agreement is found between the experimental plate height data and the recent theoretical calculations of Golay [13] taking into account the side-wall effect.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02258877
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  • 4
    Digitale Medien
    Digitale Medien
    Analysis of trimethylsilyl-isopropylidene derivatives of sorbose by combined gas chromatography- and mass-spectrometry (1982)
    Springer
    Chromatographia 15 (1982), S. 704-706 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Isopropyliden-sorboses ; TMS-derivatives ; GC-MS combined technique ; Mass spectra
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A method has been developed using gas chromatography — electron impact mass spectrometry for the determination of the di-0-isopropylidene-sorbofuranose and mono-0-isopropylidene-sorbofuranose. The compounds are separated as their trimethylsilyl derivatives on a capillary column coated with the stationary phase SE-52. The mass spectra show that the silylation reaction is quantitiative and that the isopropylidene groups does not change.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02261889
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  • 5
    Digitale Medien
    Digitale Medien
    Gas chromatographic analysis of ethylbenzene hydroperoxide (1982)
    Springer
    Chromatographia 15 (1982), S. 183-185 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Analysis of ethylbenzene hydroperoxide ; Time normalization method
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A gas chromatographic method, based on the time normalization technique, is described for the analysis of ethylbenzene hydroperoxide in mixtures containing ethylbenzene, acetophenone, 1-phenylethanol, benzaldehyde and phenol. Different liquid phases were tested and the best results were obtained with tricresyl phosphate and neopentyl glycol sebacate. The influence of the support, the liquid loading and the gas velocity are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02261537
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  • 6
    Digitale Medien
    Digitale Medien
    Retention index values of hydrocarbons on open-tubular columns coated with methylsilicone liquid phases (1982)
    Springer
    Chromatographia 15 (1982), S. 625-630 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Open-tubular (capillary) columns ; Comparison of liquid phases ; Influence of temperature ; Retention index data
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary The influence of temperature and liquid phase film thickness of open-tubular (capillary) columns on the retention index values of hydrocarbons on methylsilicone liquid phases is discussed. Data obtained on methylsilicones and squalane are compared. Retention index values of 43 hydrocarbons between 40 and 70 °C on OV-101 liquid phase are listed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02279488
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  • 7
    Digitale Medien
    Digitale Medien
    Kinetic study of the drying step of supported catalysts by reversed-flow gas chromatography (1982)
    Springer
    Chromatographia 15 (1982), S. 351-354 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Supported catalysts ; Reserved-flow GC ; Drying step ; Gas chromatography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary Application of reversed-flow gas chromatography to study the drying step in the preparation of supported catalysts is proposed. It is demonstrated that this technique can be applied to investigate the kinetic law followed, as well as to obtain kinetic parameters of drying (rate constants, activation energies and frequency factors). Amaterial illustrating this application is γ-Al2O3 impregnated with usual organic solvents (n-C5H12,n-C6H14,n-C7H16, CH3COCH3 and CH3CH2OH). It was found that in all cases above a simple first-order law based onone kind of active site is followed. Moreover, it was observed that the activation energyE a of the drying process increases almost linearly with the relative molecular mass of the solvent, whereas for the same solventE a increases with the amount used. The operation of a kinetic compensation effect suggests “similar” activated complexes of the various solvents used.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02259216
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  • 8
    Digitale Medien
    Digitale Medien
    Characterization, evaluation and in-situ cross-linking of new polar phases in capillary gas chromatography (1982)
    Springer
    Chromatographia 16 (1982), S. 63-68 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Fused silica capillaries ; New polar phases: OV-1701 and RSL-310 ; Immobilization
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary The possibilities of OV-1701 and RSL-310, two new stationary phases, have been evaluated for capillary gas chromatography in fused silica columns. OV-1701 is a cyanopropylphenyldimethyl polysiloxane of moderate polarity possessing excellent chromatographic characteristics. The phase exhibits high coating and chromatographic efficiencies, high temperature stability and is suitable for cross-linking. RSL-310 is a polar liquid stationary phase yet to be permanently bonded in a capillary column. The selectivity of both phases extends the applicability of fused silica columns.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02258871
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  • 9
    Digitale Medien
    Digitale Medien
    Gas-liquid chromatography of isopropylidene monosaccharides and their trimethylsilyl derivatives (1982)
    Springer
    Chromatographia 15 (1982), S. 241-244 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Monosaccharides ; Polyols ; GC of TMS derivatives
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary This paper describes the gas chromatographic separation of the mixture of isopropylidene monosaccharides, and their trimethylsilyl derivatives. Based on the total analysis time and resolution the best stationary phase was SF-96 using Chromosorb G as the solid support and temperature programming.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02265655
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  • 10
    Digitale Medien
    Digitale Medien
    A new device for contamination-free injection for gas chromatographic trace estimation of oxygen and nitrogen (1982)
    Springer
    Chromatographia 15 (1982), S. 312-314 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Injection-port modification ; Oxygen and nitrogen traces
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary The paper presents a new device modifying normal injection port of a gas chromatograph for eliminating air contamination thus enabling determination of traces of oxygen or nitrogen. Further modification is also proposed which enables the analysis to be carried out with a limited quantity of sample gas. Potential application of this device in the analysis of reactive gases like florine has been indicated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02265684
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