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  • Articles  (1,394)
  • Articles: DFG German National Licenses  (1,394)
  • Atomic, Molecular and Optical Physics  (1,119)
  • Gas chromatography  (275)
  • 1985-1989  (1,394)
  • Chemistry and Pharmacology  (1,394)
Collection
  • Articles  (1,394)
Source
  • Articles: DFG German National Licenses  (1,394)
Keywords
Publisher
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Year
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  • 1
    Electronic Resource
    Electronic Resource
    Spectroscopy and the classification of liquid stationary phases in gas-liquid chromatography (1985)
    Springer
    Chromatographia 20 (1985), S. 293-302 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Stationary liquid, choice of ; Physico-chemical data
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A table of data for acidity, basicity, polarity and London potential for stationary phases is given. These provide guidance in choosing a stationary phase for a given task from the 26 substances listed. The indices are calculated from infra-red shifts of 1-chlorobutane and the visible wavelength shifts of l2 when they are dissolved in the stationary phases, from NMR estimates of acidity and basicity and from relative retention data. They replace the less reliable data of Burns and Hawkes. Methods of determining the indices are suggested that require only a gas chromatograph and can be applied by technicians with no specialized understanding of solution parameters. An attempt to add electron donoracceptor indices to the table was unsuccessful. A further table is given of the slopes of the log plots d(logt′)/dC for use in extrapolating from one homologue to another on these stationary phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02310386
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  • 2
    Electronic Resource
    Electronic Resource
    A new adsorbent for trace level organic contaminants (1985)
    Springer
    Chromatographia 20 (1985), S. 343-346 
    Details
    ISSN: 1612-1112
    Keywords: Thermosorb ; Tenax GC ; Environmental Analysis ; Trace Organics ; Gas chromatography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A preliminary study has been carried out to evaluate a new adsorbent, Thermosorb, for trace level organic contaminants. For this purpose, a comparison was made with a well-characterized adsorbent, Tenax GC, using a prepared aqueous solution of trace organic components. In addition, a comparison was made of chromatograms of air contaminants obtained using both of these adsorbents, under equivalent conditions. The results clearly indicated the potential of this thermally stable, inorganic adsorbent for many trace organic substances of environmental interest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02269059
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of the flame photometric detector in the sulphur mode (1985)
    Springer
    Chromatographia 20 (1985), S. 371-375 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Flame photometric detector ; Sulphur
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The effect of experimental conditions such as gas flow rates, detector and column temperatures on sulphur response are discussed. It is concluded that the response of the flame photometric detector is affected by the O/H ratio and the total gas flow. Column temperature has an important influence upon S2 emission. It is shown that the sulphur response of the FPD is dependent on the compound containing the sulphur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02269065
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of cyanogen and cyanogen chloride using gas chromatography with a flame ionisation detector (1986)
    Springer
    Chromatographia 21 (1986), S. 161-164 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Flame ionisation detection ; Cyanogen ; Cyanogen chloride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The response of a flame ionisation detector (FID) to cyanogen ((CN)2) and cyanogen chloride (CNCI) has been studied. The lower limits of detection for (CN)2 and CNCl were 6×10−12 moles and 2×10−11 moles respectively. In a comparative study a thermal conductivity detector gave as its lower limit of detection for both (CN)2 and CNCl 4×10−11 moles. Both detectors showed excellent linearity over the range 0 to 10 micromoles. The ratio of the gradients of the FID calibrations (CN)2/CNCI were found to be approximately two suggesting the response depended on the cyanide group. The response and stability of the FID was investigated as a function of air and hydrogen flow-rates. The response increased with increasing air flow-rate for both (CN)2 and CNCI up to 300cm3min−1, thereafter no significant increase was observed. On raising the hydrogen flow from 10 to 25cm3min−1 only a slight increase in the sensitivity of the FID towards both (CN)2 and CNCI was observed. At higher flow rates the response for (CN)2 increased markedly whereas at the same flow rates the response for CNCI increased only slightly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02311746
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  • 5
    Electronic Resource
    Electronic Resource
    Studies of adsorption and solution of acetylacetonates of Cr(III), Co(III) and Al(III) by gas chromatography (1986)
    Springer
    Chromatographia 21 (1986), S. 214-218 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Behaviour of metal acetylacetonates ; Adsorption isotherms ; Heat of solution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Specific retention volumes, adsorption isotherms, molar heats of solution and changes of the entropy were determined from chromatographic data, which was obtained by the gas chromatographic separation of metal acetylacetonates. The retention data for Cr(III), Co(III) and Al(III) acetylacetonates were measured at different temperatures and different flow rates. From the retention data other values associated with adsorption and solution phenomena were calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02311889
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  • 6
    Electronic Resource
    Electronic Resource
    Immobilized stationary phase on the basis of polyethylene glycol cross-linked with pluriisocyanates of the Desmodur type (1986)
    Springer
    Chromatographia 21 (1986), S. 454-460 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Capillary columns ; Immobilized stationary phase ; Carbowax-type stationary phase ; Cross-linked polyurethane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The preparation of an immobilized stationary phase based on Carbowax 20M is described. The stationary phase cross-linking was carried out with Desmodur N 75 or Desmodur L 75, pluriisocyanates. The properties of the prepared stationary phases are compared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02341270
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  • 7
    Electronic Resource
    Electronic Resource
    Some improvements in the determination of volatile nitrosamines by fused silica capillary-GC in combination with a thermal energy analyzer (1986)
    Springer
    Chromatographia 22 (1986), S. 65-72 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Volatile nitrosamines ; Fused silica capillary columns ; Linear indices
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Fused silica capillary columns of different diameters and polarities are linked to a thermal energy analyzer and a flame ionisation detector for comparison. Extra column effects are discussed. Unsymmetrical homologue nitrosamines are applied in order to assign the volatile nitrosamines most often to be determined by their linear indices rather than by their overall retention times.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02257301
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  • 8
    Electronic Resource
    Electronic Resource
    The use of carbon monoxide and water gas as the flame-forming agent in the thermionic detector (1986)
    Springer
    Chromatographia 22 (1986), S. 95-98 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Thermionic detector ; Flame-forming agents ; CO2 and water gas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The use of carbon monoxide were suggested as the flame-forming agent in the thermionic detector (TID). The main characteristics of this detector were studied. It was shown that the optimum flow rate of carbon monoxide is 40 ml/min at an air flow rate of 400–550 ml/min. The response increases twice with the positive potential on the collector. Molar responses of TID were compared with those obtained when using carbon monoxide and hydrogen. For instance, for phosphorus containing compounds they are approximately the same (∼102), while for nitrogen containing compounds in the case of carbon monoxide, there is a 2–5 fold increase in the response. The linear dynamic range for methaphose and azobenzene is 103.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02257307
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  • 9
    Electronic Resource
    Electronic Resource
    Investigation of the interaction of olefin-bonded transition metal complexes by gas chromatography. II. Phosphine complexes of Cu(II) (1986)
    Springer
    Chromatographia 22 (1986), S. 147-152 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Metal complexes ; Chemically bonded phase ; Specific interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Packings consisting of chemically bonded diphenylphosphine complexes with CuCl2 and CuBr2 were synthesized and their retention parameters determined. The packings investigated are capable of specific interactions with electron-donating compounds and are characterized by particularly high selectivity in relation to cis and trans isomers allowing their complete separation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02257316
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  • 10
    Electronic Resource
    Electronic Resource
    Selective sampling and capillary gas chromatography in the analysis of essential oils (1987)
    Springer
    Chromatographia 23 (1987), S. 818-824 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Selective sampling ; On-line fractionation ; Essential oil analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The paper describes the possibilities of on-line selective sampling as an on-line fraction technique for the analysis of essential oils. Selective sampling is a micro-separation method, on-line with on-column injection, carried out directly in the syringe body by means of a selective elution of the sample through a fraction cartridge. The paper reports a method of both preparing and standardizing silica gel cartridges, and illustrates through some examples the results of some elution series of solvents on different essential oils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02311406
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