Acquisition Frequency in FAST-GC
Figure 1
- Effect of the acquisition frequency on the
peak shape. In FAST-GC, peaks could have very
narrowwidth (even less than 500ms). For this reason
is important to have an “high-speed” detector able to
collect at least 10 points for every peak, thus to
correctly describe the peak itself. In this way the peak
can be properly integrated and quantified.
In FAST-
GC an acquisition rate of at least 50Hz is
recommended.
Table 1.
These are the dimensions of the columns that can be found in the catalogue. For each column it is reported
the number of theorical plates (N) calculatedwih the formulawritten on the previous page (1). We advise not to use 100
micron i.d. columns longer than 10 m and 50 microns i.d. columns because the pressure needed it will be too high on
the today strumentation!
Effect of the acquisition frequency on the shape of the peak and on the goodnes of
integration
Figure 1.
Effect of the acquisition frequency on the peak's shape. With these kinds of narrow peaks like the ones of
FAST-GC (from 0.5 to 2 s) it is necessary to acquire the signal with high frequencies in order to have a correct peak
shape and to be able to be adequately integrated. Achievement frequencies of 50 Hz are acceptable, frequencies of 100
Hz are optimal for most cases.
MEGA s.n.c - Capillary Columns Laboratory -Via Plinio, 29 - 20025 Legnano (MI) - Italy - tel./fax:+39 0331.54.79.24 -
-
Since 1980
