Alkali Metal Modification of Silica Gel-Based Stationary Phase in Gas Chromatography

Table 5

Separation efficiency parameters of selected stationary phases using aromatics as probes.

Column	Benzene, toluene		Toluene, ethyl benzene		Ethyl benzene, propylbenzene		Propylbenzene, butylbenzene		Uniformity criterion
	ά	𝑅	ά	𝑅	ά	𝑅	ά	𝑅
Si	1.183	2.732	1.113	2	1.101	2	1.123	2.28	0.33
SiNa10%	1.16	3.2	1.1	2.33	1.09	1.87	1.12	1.94	0.465