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The retention gap technique in combination with on-column injection allows concentration of a large sample volume in the capillary column. Retention gaps consist of uncoated (no stationary phase), deactivated fused silica capillary tubing. A retention gap must be inert without any noticeable retention (analytes are not retained). Phenylmethyl (low-medium polar) deactivated tubing as an additional choice of surface deactivation. Improve peak shape by focusing and concentration of the sample components when introducing a large sample volume onto the column.
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Method
Gas chromatography (GC), accessories
Temperature stability (max)
320 °C
Polarity
Low–medium polar
Suitable solvents
Many solvents, nonpolar and mid-polar, but not with methanol and water
Deactivation
Phenylmethyl silylated
Type
Retention gap
Recommended application(s)
Improve peak shape by focusing and concentration of the sample components when introducing a large sample volume onto the column
Capillary outer diameter
0.4 mm (0.25 mm ID) - 0.5 mm (0.32 mm ID) - 0.8 mm (0.53 mm ID)
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