A fast GC column has a much smaller internal diameter than a standard GC column. It is also much shorter and more flexible.
Faster analysis can be achieved in any of the following ways
A less thick film is required when the Column ID is reduced, in order to retain the same phase ratio. Phase ratio = column ID (μm) / (4 x film thickness (μm))
|
Film thickness (μm) |
|||
0.10 |
0.25 |
0.50 |
1.0 |
|
Column ID (mm) |
Phase ratio |
|||
0.10 |
250 |
100 |
50 |
25 |
0.25 |
625 |
250 |
125 |
63 |
0.32 |
800 |
320 |
160 |
80 |
0.53 |
1325 |
530 |
265 |
133 |
The low carrier gas flow rates used with fast columns can cause band broadening in the injection port, especially during splitless injections.
If a liner with a small internal volume is used, the velocity of the carrier gas through the liner will be increased. This reduces the amount of time the sample spends in the injection port minimizing band broadening.
A liner with an internal diameter of 2 mm or less needs to be used in splitless mode to reduce mass discrimination.
This calculation is only good for isothermal analysis, but use as a guide.
There are two options
Part number |
Phase |
Description |
054022 |
BP1 |
10 m x 0.1 mm x 0.1 µm |
054099 |
BPX5 |
10 m x 0.1 mm x 0.1 µm |
054405 |
BP20 |
10 m x 0.1 mm x 0.1 µm |
054600 |
BPX70 |
10 m x 0.1 mm x 0.2 µm |
054690 |
HT8 |
10 m x 0.1 mm x 0.1 µm |
054699 |
BPX35 |
10 m x 0.1 mm x 0.1 µm |
0547100 |
SolGel-WAX |
10 m x 0.1 mm x 0.1 µm |
054740 |
BPX50 |
10 m x 0.1 mm x 0.1 µm |
054777 |
BPX1 |
10 m x 0.1 mm x 0.1 µm |