Abstract
THE distinction between the efficiency and the separating power of gas chromatographic columns has been widely appreciated for some time. Recently1, I have shown that a separation factor S can be defined by : where α = (V R2/V R1) > 1, that is, the true relative retention volume (or time) of a given pair of substances. The value of S deduced from equation 1 corresponds to the exact separation of the two substances and is equal to the number of theoretical plates required to give the separation when the true retention volume is much greater than the free gas or dead volume, V d, of a column. The apparent retention volume, V′ R, used in the usual theoretical plate equations is the sum of V d and V R for a given substance.
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Purnell, J. H. (in course of publication).
Purnell, J. H., and Quinn, C. P. (in course of publication).
van Deemter, J. J., Zuiderweg, F. J., and Klinkenberg, A., Chem. Eng. Sci., 5, 271 (1956).
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PURNELL, J. Comparison of Efficiency and Separating Power of Packed and Capillary Gas Chromatographic Columns. Nature 184, 2009 (1959). https://doi.org/10.1038/1842009a0
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DOI: https://doi.org/10.1038/1842009a0
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