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Typical quantities of the standard MCC contained 1200 capillaries 40 μm in a diameter each with thickness of a liquid stationary phase film 0.2 μm are given in the Table: |
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Some Performances of Multicapillary Columns |
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Operation factors |
Straight MCC 220 mm long |
Coiled MCC 1 m long |
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Volume of a gas mixture injected, ml |
0,2 |
1 |
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Mass of a sample injected, microgram/component |
2 |
10 |
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Efficiency, theoretical plates |
2 000-4000 |
9000- 14000 |
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Carrier gas flow rate, ml/min |
35-60 |
35 - 60 |
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Carrier gas velocity, cm/s |
40 |
22 - 40 |
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Pressure difference, atm |
0,4 |
2,0 |
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Maximum factor of capacity |
100 |
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Cycle time of analysis, s |
30 - 60 |
60 - 600 |
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Maximum temperature for stationary phase OV-1, 0C |
200 (MCC is sealed in a tube by silicone hermetic) |
250 (MCC is sealed in fittings by graphite ferrules) | |
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It is worth noting that a MCC can be used without loss of the efficiency at the significantly greater flow rates than are displayed in the Table. This fact is an obvious consequence of the experimental dependence given below.
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Another feature of MCC lies in the fact that separations on MCC are usually carried out at approximately 200C lower temperatures than on the other columns. | |
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