ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 63, Number 4
JKCSEZ 63(4)
August 20, 2019 

In the system of GC-OTC/FID (Gas chromatography-Open Tubular Column/Flame Ionization Detector), DMSO (Dimethyl sulfide) solvent was used to separate the polar solvents (Alcohols). In this system DMSO was eluted later than the separated polar solvents. At this system to calculate chromatographic factors [adjusted retention time (tR'=tR-tO), capacity factor{ k'=(tR-tO)/tO} and separation factor {α=(tR2-tO)/(tR1-tO)}], dead time(tO) is necessary, but the method to calculate it has not been reported yet. Therefore, we have tried to develop tO. To calculate tO, we conversed DMSO retention time (DMSO tR) to logarithm (f(x)=log tR(DMSO)→tO, tO=log 9.551=0.980). To confirm the optimization of the developed method, we compared with CH4 tR and ln tR(DMSO). Both of the values calculated by CH4 tR and ln tR(DMSO) were not suitable in the calculation k' and α. The developed method in this study{log tR(DMSO)} has satisfied both of the values k' criteria (1<k'<10) and α (1<α<2). The developed calculation method in this study was easy and convenient, therefore it can be expected to be applied to these similar systems.