Preparing for Operation
Preparing sample vials
30
For large volumes and multiple injections, you will have to decide how to
divide the sample among several vials to obtain reliable results. You have to be
aware when sample volume is low. For example, if the vials are less than half
full, contaminants from the previous sample injection or solvent washes may
affect the sample. Due to the various parameter settings available, the many
suppliers of consumables, and the choices of vials, microvials, vial caps, and
septa, some method development will need to be done to optimize your
analysis.
Figure 21. Recommended volumes for sample vials
Caution If the vials are more than half full, a vacuum may interfere with the syringe
delivering a precise volume.
Do not inject air into the vial to compensate for the vacuum. Injecting air into
the vial often damages the cap septum so that it is no longer airtight.
Crimp capping sample vials
Use a crimper to put on the airtight crimp caps.
1. Clean off the inside surfaces of the crimper jaws.
2. Place the crimp cap over the top of the vial.
*Needle position based on standard sampling depth. See chapter 3 for more information on setting parameters
for sampling depth.
1 ml
2-ml vial
3.6 mm*
50 ml
100-ml vial
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