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  • 1
    Digitale Medien
    Digitale Medien
    Evaluation of methods of measuring gas-solid chromatographic retention on skewed peaks (1986)
    s.l. : American Chemical Society
    Analytical chemistry 58 (1986), S. 2663-2668 
    Details
    ISSN: 1520-6882
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ac00126a019
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  • 2
    Digitale Medien
    Digitale Medien
    Wetting transition in squalane on a silanized diatomaceous gas chromatographic support (1985)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 89 (1985), S. 2571-2576 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100258a029
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  • 3
    Digitale Medien
    Digitale Medien
    Changes in peak width and concentration at the inlet and outlet of a chromatographic column (1984)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 615-619 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Theory ; Sorption ; Plate model ; Band widths ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The original plate model of chromatography is extended to the sorption process occurring at the column inlet and the desorption process at the column exit. At the column inlet it is shown that sufficiently wide feed bands undergo no change in concentration but a fall in band width, i.e., the volume of mobile phase occupied by the solute band is reduced. The reduction factor is (1 + k) where k is the mass distribution ratio (capacity factor). Narrower bands suffer partial reduction in both band width and concentration. On desorption at the outlet, however, the change is always in band width and not concentration. A perfect detector registers the true concentration-time profile of the band in the column if the solute mass fraction in the stationary phase is below 10-3 at the column outlet. The risks of stripping the stationary phase at high solute concentrations in analytical and preparative or production gas chromatography are compared.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240071103
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  • 4
    Digitale Medien
    Digitale Medien
    Peak distortion in chromatography. Part 1: Concentration-dependent behavior (1982)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 5 (1982), S. 341-348 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Asymmetrical or tailed peaks are a common problem in chromatography. The causes of this distortion are described and classified. Each case is discussed from the point of view of first diagnosing the cause of asymmetry end then dealing with it appropriately; e.g. by removing the cause or, in applications to physicochemical measurement, by using more appropriate measures of retention than the residence time of the peak maximum. The classification of sources of asymmetry applies to both gas and liquid chromatography, allowing information derived from one field to be extended to the other.Part 1 of this review covers nonlinear, concentration-dependent behavior with and without nonideal band-spreading. Part 2 will deal with sources of distortion controlled by the kinetics of transport or reaction processes, viz. apparatus effects, incomplete resolution, slow kinetic processes, chemical reaction, and column voids.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240050702
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  • 5
    Digitale Medien
    Digitale Medien
    Peak distortion in chromatography. Part 2: Kinetically controlled factors (1982)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 5 (1982), S. 397-403 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The review of the characterization, diagnosis, and treatment of peak distortion begun in Part 1 is concluded. Part 1 dealt with peak distortion caused by nonlinear (concentration-dependent) chromatographic behavior in the column. The present part covers peak distortion due to either the apparatus, incomplete resolution, slow kinetic processes, reaction on the column, or column voids. All these sources are controlled by the kinetics of transport or reaction processes.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240050802
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  • 6
    Digitale Medien
    Digitale Medien
    Chromatographic theory and basic principles. Edited by J. Å. Jönsson, Marcel Dekker, New York (1987), ISBN 082477673-9 (1989)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 12 (1989), S. 407-407 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240120614
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  • 7
    Digitale Medien
    Digitale Medien
    Design of a production gas chromatograph for separating heat-sensitive materials (1982)
    Springer
    Chromatographia 16 (1982), S. 44-47 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Production gas chromatography ; Design of equipment ; Heat-sensitive essential oils
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A rational design procedure for production and preparative chromatography has previously been devised. Here the procedure is applied to designing a pilot scale production gas chromatograph for separating two heatsensitive essential oil mixtures: geraniol/nerol and α-/β-pinenes. Analytical scale experiments provide some of the data required. A critical feature of the design is that these materials degrade at temperatures well below their boiling points. The design study leads, first, to selection of carrier gas, stationary phase and solid support materials, and then to quantitative determination of column temperature, evaporator temperature, feed concentration in the carrier gas, column diameter, particle size of support, carrier velocity, ratio of recycled to inject feed, injection time, column length, and liquid phase loading.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02258867
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  • 8
    Digitale Medien
    Digitale Medien
    Thermodynamic measurement by gas chromatography at finite solute concentration (1974)
    Springer
    Chromatographia 7 (1974), S. 387-394 
    Details
    ISSN: 1612-1112
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary This paper surveys gas chromatographic methods for making thermodynamic measurements at finite solute concentration. The factors which determine the shape of elution and frontal chromatograms are first described. The retention volume equation is obtained for finite concentration taking into account the sorption effect and curvature of the distribution isotherm. A new and reasonably accurate equation (Equation 20) is then derived for calculation of the isotherm from chromatographic measurements. Comparison is made with an older, much used procedure which is shown to give large errors through neglecting the sorption effect. Experimental results with both accurate and inaccurate procedures are surveyed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02330941
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  • 9
    Digitale Medien
    Digitale Medien
    Performance optimisation for production gas chromatography (1975)
    Springer
    Chromatographia 8 (1975), S. 60-66 
    Details
    ISSN: 1612-1112
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A suitable criterion of performance for a production chromatograph is the total separation cost, including capital and operating costs, per unit mass of product. A semi-empirical expression for this parameter is developed for gas-liquid chromatography. The equation is used to find the effect of chromatographic design and operating variables on performance and, where relevant, to find the optimum values of these variables. Optimum values exist for feed band width, column length, degree of band overlap and column temperature. In general, the carrier velocity and feed concentration should be as high as possible and the theoretical plate height as low as possible. The stationary phase loading has only a small, if any, net effect on performance. The stationary phase should be chosen for its chemical stability, involatility and enhancement of solute relative volatility.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02284350
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