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A set of retention times ( t  R ) of  n -alkanes at different temperatures and the primary dead times ( t  M ) are used to determine the 4 numerical constants ( a, b, c , and  d ) of an equation. This equation is rearranged into a second equation, used in turn for routine calculation of the secondary dead time ( t  MS ) of each chromatogram from any member of the  n -alkane series. Equation 2 can be used to calculate the  t  MS  of both packed and capillary columns. The calculated  t  MS  values are in good agreement with those of the  t  M  values. The greatest difference is 3.38%, but it is speculated that the percent difference would be lower when more  t  R  data are collected for the determination of the 4 numerical constants of Equation 1. Error in measurement of retention time undoubtedly would affect the accuracy of the estimated dead time, but it is attenuated by a factor of 1 +  e (a + bN+ C/T+ dN/T)  .

A Convenient Method for Routine Estimation of Dead Time in Gas Chromatography