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  • Applied geophysics
  • Gas chromatography
  • Springer  (21)
  • DGMK & Unikontakt
  • Elsevier
  • Institute of Physics
  • 1985-1989  (21)
  • 1985  (21)
Collection
Keywords
Publisher
Years
  • 1985-1989  (21)
Year
  • 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
    The dependence of the properties of liquid crystals on the film thickness and surface quality of capillary columns (1985)
    Springer
    Chromatographia 20 (1985), S. 601-608 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Liquid crystal ; Capillary columns ; Retention data ; Stationary phase film thickness ; Column surface quality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Glass capillary columns were prepared from non-deactivated and deactivated glass and coated with (2-methyl-4-[trans-4-n-propyl-cyclohexylcarbonyloxy]-benzoic acid-[4-n-heptyloxy-phenylester]) as the liqud phase, in different film thicknesses. The columns were tested using substances of different structures and polarities. It was verified that the capacity factors, retention indices and selectivity significantly depend on the thickness of the liquid crystalline stationary phase film and the quality of the tube, particularly in the case of columns with thin films. Trasition temperatures (melting and clearing point) of the liquid crystal are also dependent on these two factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02263219
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  • 5
    Electronic Resource
    Electronic Resource
    Esterification of amino acids to n-butyl and isobutyl esters in aqueous solutions for their gas chromatographic analysis (1985)
    Springer
    Chromatographia 20 (1985), S. 652-656 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Esterification in aqueous solution ; n-Butyl esters of amino acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Amino acids have been esterified with n-butanol and isobutanol in the presence of perchloric acid. It has been established that in the concentration range of [H2O]/[n-BuOH]=0.10–0.40 esterification can be utilized for the determination of alanine, glycine, valine, leucine, proline, methionine, aspartic acid, phenylalanine, tyrosine, glutamic acid, lysine, arginine, histidine and cystine. In the case of [H2O]/[i-BuOH] =0.05–0.20 the esterification yield decreases from 100% to 70%, in proportion to the water content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262686
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  • 6
    Electronic Resource
    Electronic Resource
    A GC-system for the analysis of residual geothermal gases (1985)
    Springer
    Chromatographia 20 (1985), S. 681-682 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Geothermal gases ; Molecular sieves ; Low temperature separations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The gases evolved from geothermal fields, after condensation of H2O, CO2, H2S and NH3 in caustic solution, contain He, H2, Ar, O2, N2, CH4 and higher hydrocarbons. The analysis for the major components in these residual gas mixtures can be achieved by use of two simple gas chromatographs in parallel, and using 5Å molecular sieve. The separation of He and H2 to baseline is achieved by using low temperatures (30°C) coupled with a relatively long column; and the difficult separation of Ar and O2 is achieved by use of a cryogenically cooled column. The use of switching valves to backflush and bypass columns ensures that a minimum time for analysis can be achieved whilst retaining baseline separations of the He/H2 and Ar/O2 pairs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262691
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  • 7
    Electronic Resource
    Electronic Resource
    Formation of derivatives of chlorophenoxy acids and some other herbicides (1985)
    Springer
    Chromatographia 20 (1985), S. 685-688 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Fuming sulphuric acid-ethanol esterification ; Ethyl and methyl esters of herbicides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A fuming sulphuric acid-ethanol esterification method has been applied to chlorophenoxy acids and some other herbicides. This method is compared with esterification by iodoethane and diazomethane. The chlorophenoxy acids studied were: 2,4-D, dichlorprop, MCPA, MCPB, mecoprop and 2,4,5-T. Other herbicides studied were: benazolin, bentazone, bromophenoxime, bromoxynil, chlorthal, dicamba, 3,6-dichloropicolinic acid, dinoseb, ethephon, fluroxypyr, glyphosate, haloxyfop, ioxynil, picloram, 2,3,6-TBA and triclopyr. Fuming sulphuric acid-ethanol esterification can be successfully applied to chlorophenoxy acids, benazolin, 3,6-dichloropicolinic acid, dinoseb, fluroxypyr, haloxyfop, picloram and triclopyr. The reproductibility of the method is ±5%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262693
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  • 8
    Electronic Resource
    Electronic Resource
    Application of the chromatographic step profile method for determination of water film pressure and surface free energy of quartz (1985)
    Springer
    Chromatographia 20 (1985), S. 724-728 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Step profile method ; Adsorption isotherm ; Water film pressure ; Surface free energy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Investigation of water adsorption by the step profile method (Glueckauf method) was carried out with the help of a modified gas chromatography equipped with thermal-conductivity detector. On the basis of the adsorption isotherm obtained, the water film pressure and the polar component of the surface free energy of quartz were calculated. The calculated value of the polar component of the surface free energy of quartz agrees with analogous values obtained by other methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02282930
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  • 9
    Electronic Resource
    Electronic Resource
    An improved energy generator for the study of reactions of thermal-energy electrons with organic compounds (1985)
    Springer
    Chromatographia 20 (1985), S. 149-154 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Electron-capture ; Thermal-energy electrons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The products resulting from the reaction between thermal energy electrons and organic compounds have been investigated to further our knowledge of the mode of action of the electron-capture detector. Thermal energy electrons were generated by maintaining a corona discharge between a stainless steel cathode and a silver/silver chloride anode. The effects of electrode geometry, gas composition, gas flow rate, and the physical properties of the test substances were investigated. The design of the reactor was modified to minimize losses of unchanged substrate. Reaction products of benzaldehyde, tolualdehydes, chlorobenzaldehydes, and dichlorobenzenes were identified by combined gas chromatography — mass spectrometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262703
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  • 10
    Electronic Resource
    Electronic Resource
    Wide-bore capillary columns for gas chromatography (1985)
    Springer
    Chromatographia 20 (1985), S. 195-196 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Wide-bore capillaries
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262711
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