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- W2019941387 abstract "Abstract For a typical narrow bore (50 μm) and wide bore (320 μm) capillary column the effects of increased stationary phase film thickness (d f ) on the minimum detectable amount, Q o , as well as on the minimum analyte concentration, C o , are described. In treating the effect of an increased film thickness, two approaches can be followed; either the separation temperature is kept constant, resulting in larger values of the capacity ratio, k, or the column temperature is increased such as to keep k constant. For normalized chromatographic conditions the effects of both approaches on the minimum plate height, optimum carrier gas velocity, and required plate number are described, finally yielding expressions for Q o and C o for both mass flow and concentration sensitive detectors. At constant temperature, C o always increases with the film thickness for mass flow sensitive detectors ( e.g. FID). Wide bore thin film columns offer the lowest value of C o attainable. For concentration sensitive detectors ( e.g. TCD), C o is affected neither by column diameter nor by film thickness. The Q o –d f plot for constant temperature shows a minimum, suggesting an optimum film thickness for mass flow sensitive as well as concentration sensitive detectors. The corresponding capacity ratio has a value between 0.5 and 1.5. At elevated temperatures (k constant) in combination with mass flow sensitive detectors, again an optimum film thickness exists, corresponding to a minimum value of C o . For constant capacity ratio Q o always increases with the film thickness for both types of detectors. As indicated above, in some situations the lowest values of C o and Q o are obtained at an increased film thickness, the effect being marginal. As an initial guideline, for the daily practice of capillary gas chromatography with respect to minimum values of C o and Q o , the use of thin film columns is to be preferred." @default.
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- W2019941387 date "1988-03-01" @default.
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- W2019941387 title "The effect of column characteristics on the minimum analyte concentration and the minimum detectable amount in capillary gas chromatography. Part II: The stationary phase film thickness" @default.
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- W2019941387 doi "https://doi.org/10.1002/jhrc.1240110309" @default.
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