An empirical equation for the calculation of retention time with extrapolation of temperature in gas chromatography

Summary

An empirical equation is proposed to accurately correlate isothermal data over a wide range of temperature. With the equation lnk=A ^* +B ^* /T ^λ the retention times of different solutes tested on OV-101, SE-54 and PEG 20M capillary columns have been achieved even when λ is assigned a constant value of 1.7. Comparison with lnk=A+B/T and lnk=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. ParametersA ^* andB ^* as well asA andB are also discussed. The linear correlation ofA ^* andB ^* is weaker than that ofA andB.