Thermal and Hydrothermal Treatment of Silica Gels as Solid Stationary Phases in Gas Chromatography

Table 2

Rohrschneider index for the parent and treated silica gels as solid stationary phases.

Column		Benzene (X)	Ethanol (Y)	Methyl ethyl ketone (Z)	Nitro methane (U)	Pyridine (S)	Average
Si	Δ𝐼	144	602	720	418	830	542.8
SiC500	Δ𝐼	49	584	681	327	763	480.8
SiC1000	Δ𝐼	138	578	556	392	497	432.2
SiHT	Δ𝐼	128	402	526	237	925	518.8
SiCHT	Δ𝐼	93	606	847	387	733	533.2