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

Table 1

The parent, calcined, and modified silica samples.

Notation	Treatments
Si	Parent silica gel (60–80 mesh)
SiC500	Silica gel calcined at 500°C
SiC	Silica gel calcined at 1000°C
SiNa	Parent silica gel exchanged by NaCl using soaking method
SiNa10%	Silica gel calcined at 500°C and then exchanged with 10% NaCl using evaporation method
SiCNa	Silica gel calcined at 500°C and then exchanged with NaCl using soaking method