Correlation of Characteristic Thermal Constant and Elution Temperature in GC

In a temperature-programmed analysis, the solutes that elute at higher temperatures have generally larger characterisitic thermal constants, θchar. The change approximately matches the temperature-related increase in a carrier gas viscosity. Accounting for the effect allows reduction in the uncertainty of prediction of θchar by a factor or f ∼2 and, in a constant-pressure mode, description of a linear heating ramp by the same dimensionless rate for all solutes.