By V.G. Berezkin
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Using molecular sieve 13X it is possible to separate paraffinic and naphthenic hydrocarbons according to carbon number . However, the retention of high boiling hydrocarbons was very high. 5 h (see Fig. 2-3a ). 3 ym porous layer, C I I hydrocarbons elute at 400 "C (see Fig. 2-3b ). ALOT column permits to decrease the maximal separation temperature (400 "C instead of 500 "C). 3 Some Peculiarities of Capillary Adsorption Columns Fast analysis of volatile compounds is very important for chromatographic practice because permanent gases and low molecular weight organic compounds are frequently found in process steam and air-environmental samples.
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42. Jennings W. Gas Chromatography with Glass Capillary Columns. Academic Press, New York, 1978. 43. , Komarek K. Kapilarni koloni v plynove chromatographii. ). 44. L. Quantitative Gas Chromatography. Elsevier, Amsterdam, 1988. 45. M. Chem. Rev. 89 (1989) 287. Capillary Gas Adsorption Chromatography V. G. Berezkin and Jaap de Zeeuw Copyright 0 2002 WILEY-VCH Verlag GmbH i3 Co. g. ). Separation of compounds on these columns is mainly based on differences in the interactions of the molecules of chromatographed compounds with a liquid stationary phase.