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

Table 2

Rohrschneider index of parent and alkali metal modified silica stationary phases.

Column		Benzene (X)	Ethanol (Y)	Methyl ethyl ketone (Z)	Nitro methane (U)	Pyridine (S)	Average
Si	𝐼	808	1043	1302	956	1568	542
	Δ𝐼	144	602	720	418	830
SiNa	𝐼	749	1047	1401	882	1514	526
	Δ𝐼	84	606	819	345	776
SiNa10%	𝐼	791	1029	1101	820	1314	418
	Δ𝐼	127	588	520	282	576
SiC	𝐼	802	1020	1138	930	1234	432
	Δ𝐼	138	578	556	392	497
	Δ𝐼	349	537	414	714	582
SiCNa	𝐼	792	844	1108	775	1662	443
	Δ𝐼	128	402	526	237	925