SummaryA numerical approach has been developed for the correlation of retention times (total retention time) with temperature in gas chromatography, which allows the calculation of retention parameters including retention index from data acquired under lvvo or more different temperature program conditions. By using this procedure the optimization of temperature condition can be further achieved, especiallywhen a temperature-programmed run is the most suitable mode in the preliminary development of an analytical method for the analysis of an unknown sample.

SummaryAn empirical equation is proposed to accurately correlate isothermal data over a wide range of temperature. With the equation in k -A* + B*/T "~ the retention times of different solutes tested on OV-101, SE-54 and PEG 20M capillary columns have been achieved even when 2 is assigned a constant value of 1.7. Comparison with i n k -A + BIT and in k -c + d / T + h/T 2, shows that the proposed equation is of higher accuracy and is applicable to extrapolation calculation, especially from data at high temperature to those at low temperature. Parameters A* and B* as well as A and B are also discussed. The hnear correlation of A* and B* is weaker than that of A and B.