NEW PARAMETERS FOR THE CHARACTERIZATION OF RELATIONSHIP BETWEEN GAS-CHROMATOGRAPHIC RETENTION AND TEMPERATURE

Estimation of the gas chromatographic retention at different temperatu res can be carried out by calculation of the parameters relating capac ity ratio (k) and temperature; these parameters can also be used in th e optimization of separations. However, their use in the characterizat ion of gas chromatographic retention requires precise measures, since they are very sensitive to experimental errors. We propose in this stu dy the use of the parameters T(ik) (defined as the isothermal column t emperature at which a compound i has a capacity ratio k) and of other parameters derived from them by principal component analysis, in order to characterize, in several approximation levels, the relationship be tween k and T for any compound/column pair, and as a starting point fo r the calculation of gas chromatographic retention and the optimizatio n of separations.