Extension of Golay plate height equation for open-tubular columns

Golay plate height equation with its B-term equal to 2Dm/u (Dm is molecular diffusivity of a solute in the carrier gas and u is the gas velocity) has been developed for WCOT (wall-coated open-tubular) GC columns with liquid stationary phases. In a more general case of OTC (open tubular columns) such as the PLOT (porous layer open-tubular) columns and others, the B-term is 2(Dm + kDS) / u (DS and k are the solute net diffusivity in the stationary zone and the retention factor, respectively) which can be substantially larger than 2Dm / u. A simple proof is provided together with other adjustments in Golay equation, and its interpretation.