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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Chromatographia 4 (1971), S. 147-155 
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurde ein FORTRAN IV-Computerprogramm ausgearbeitet, mit dem sich die Retentions-Indices von Substanzen unter beliebigen Versuchsbedingungen für jede Art von chromatographischen Analysen schnell berechnen lassen. Sowohl n-Paraffine als auch andere homologe Reihen können als Bezugssubstanzen verwendet werden, und die Datenverarbeitung sowohl von isothermen als auch von temperaturprogrammierten Analysen ist möglich. Das Programm ist so konzipiert, daß es leicht von jedem Benutzer der Gas-chromatographie angewendet werden kann, ohne daß eine spezielle Kenntnis der Programmier-Sprache erforderlich wäre.
    Abstract: Résumé Un programme écrit en FORTRAN IV est mis au point; il permet le calcul rapide des indices de rétention des substances dans n'importe quelle condition expérimentale et pour diverses espèces d'analyses chromatographiques. Les termes homologues de la série ses paraffines ou d'autres substances peuvent être utilisées comme substances de référence et des données provenant de chromatographies isothermes ou à température programmée peuvent être utilisées. Le programme a été conçu pour être facilement utilisé par tous les chromatographistes sans qu'il leur soit nécessaire de posséder des connaissances particulières du langage de programmation.
    Notes: Summary A FORTRAN IV computer program was developed, which allows rapid calculation of retention indices of substances in any experimental condition and with every kind of chromatographic analysis. Either normal paraffins or other homologous series can be used as reference substances, and data from isothermal and temperature programmed analysis can be processed. The program was designed to be easily used by any gas chromatographer, without need of particular knowledge of programming language.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 15 (1992), S. 428-433 
    ISSN: 0935-6304
    Keywords: Capillary GC ; Serially connected capillary columns ; Wide bore open tubular columns ; Industrial solvents ; Prediction of retention times ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The gas chromatographic separation of the components of a complex mixture of industrial solvents, not possible on a single stationary phase owing to coelution of some of the compounds, has been achieved on two serially connected wide bore capillary columns of different polarity.The analysis of a mixture of twenty five compounds was optimized using the serial gas chromatography theory of Purnell and Williams. The capacity factors of sample components measured with the two columns coupled in series were found to agree with those predicted by theory, regardless of the order in which they were connected.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 17 (1994), S. 31-36 
    ISSN: 0935-6304
    Keywords: Capillary GC ; Graphitized carbon black ; Carbon layer open tubular columns ; Column polarity ; Retention times prediction ; Programmed temperature GC ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The polarity of carbon layer open tubular (CLOT) columns coated with a layer of non-porous graphitized carbon black (Carbopack B) modified with an appropriate amount of polar polyglycol liquid phase has been evaluated and compared with that of standard polar (Supelcowax-10) and non-polar (SPB-1) bonded phase open tubular columns. The efficiency and selectivity were measured at various temperatures and the polarity of the columns was evaluated by use of McReynolds' constants and the difference in apparent carbon number, ΔC of linear alkanes and alcohols. The polarity of the CLOT column was found to depend on temperature, and changing the analytical conditions therefore enabled the separation of compounds of different polarity whose reciprocal position and resolution were affected by temperature. The application of calculation methods which enable programmed temperature retention times to be predicted from isothermal data was also found to be possible when the polarity of the CLOT column changes with temperature.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 16 (1993), S. 46-51 
    ISSN: 0935-6304
    Keywords: Capillary GC ; Retention time prediction ; Programmed temperature ; Linear programming ; Chlorobenzenes ; Iterative procedure ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Retention times in linear temperature programmed gas chromatography on narrow bore and megabore capillary columns have been calculated from experimental retention times measured at three isothermal temperatures: an iterative procedure performed by BASIC programs was used to obtain the values of the constants enabling the calculation of the programmed temperature retention times. Different methods of calculation have been compared.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 19 (1996), S. 377-382 
    ISSN: 0935-6304
    Keywords: Capillary chromatography ; Boiling points prediction ; Identification ; Chlorobenzenes ; Phenols ; Programmed temperature ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Quantitative correlations between physicochemical parameters and structure of various solutes and their gas chromatographic behavior were investigated in order to predict the retention values. The identification of unknown samples in gas chromatographic routine analysis of environmental samples is enhanced by the use of these correlations in conjuction with other chromatographic methods and with mass spectrometry. The boiling points of many compounds are easily found in literature and therefore their correlation with retention values obtained in isothermal or programmed temperature analysis permit restriction of the choice of names of unknown compound to within a narrow range. The correlation between the boiling points and the retention times of chloro- and bromo-benzenes and of some chloro- and nitro- substituted phenols was investigated on non-polar capillary columns and permitted the tentative identification of many compounds belonging to these homologous series.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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