A comparison between the three column types, especially between the wide-bore and the packed column will provide insight into the practical uses and advantages of wide bore columns for particular applications.
- Efficiency: a small internal diameter and relatively short column length
- Fast analysis time: high gas velocity: short narrow-bore columns
- Inertness: Capillary fused-silica columns give good peak shape, suitable for trace analysis
- Large sample capacity: large column diameter, high amount of stationary phase (film thickness)
| Column type | Efficiency |
Speed | Capacity |
| Narrow-bore thin-film | ++ | ++ | -- |
| Narrow-bore thick-film | + | + | - |
| Wide-bore |
+/- | +/- | + |
| Packed, low load | - | +/- | + |
| Packed, high load | -- | -- | ++ |
| Analysis time (min) | Efficiency packed column |
Efficiency wide-bore column | efficiency wide-bore/packed |
| 10 | 5000 | 8700 | 1.7 |
| 7.5 | 4700 | 7400 | 1.7 |
| 5.0 |
2800 | 5800 | 2.6 |
| Plate number, Nth | Analysis time packed column (min) | Analysis time wide-bore column (min) | Analysis time wide-bore/packed |
| 3000 | 5.6 | 3.8 | 1.5 |
| 4000 | 6.6 | 4.4 | 1.5 |
| 5000 |
10 | 5.2 | 1.9 |
Packed vs wide-bore columns
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