Use of equations for the description of experimental dependence of the height equivalent to a theoretical plate on carrier gas velocity in capillary gas-liquid chromatography

Optimal equation for fitting the experimental data on the height equivalent to a theoretical plate (HETP) versus carrier gas velocity in GLC was deter mined. The data obtained by authors and the literary data by other investig ators were used for the comparative study of Van Deemter, Golay and the lit tle known Golay-Guiochon equations. The Golay-Guiochon equation takes into account instrumental contribution and other sources of additional band broa dening. Correlation coefficient R and Pirson's criterion chi(2) were used a s a criterion of the data correspondence to the equations. The Golay-Guioch on equation is the best for fitting of the experimental data in 71% conside red examples, 19% experimental data may be fitted very precisely by the Van Deemter equation, the Golay equation is preferable for 7% experimental dat a only. Three percent experimental data may be fitted with the same precisi on by the Golay and the Van Deemter equations. The results obtained are of theoretical and practical interest. The Golay-Guiochon equation must be use d more widely in analytical practice and physicochemical measurements. (C) 2000 Elsevier Science B.V. All rights reserved.