Analysis of the equations for the temperature dependence of the retention index I. Relation between equations

The relation between the parameters of several equations for the retention index temperature dependence was established, taking the hyperbola deduced from the retention theory as starting point. The transformation factors dep end only on methylene contributions to the thermodynamic functions of solut ion and temperature. Their evolution with the mean temperature of the range was illustrated for SE-30 and Carbowax-20M glass capillary columns. On thi s basis the post-run standardisation of dI/dT values at a reference mean te mperature is possible. Examples and statistical correlation between series of parameters from different equations for perfumery solutes were shown. (C ) 1999 Elsevier Science B.V. All rights reserved.