90 User Information
Preparing a Sample
Sample Preparation
Place samples for headspace extraction in glass vials. Place the
glass vials in the Headspace Sampler tray. In general, fill sample
vials about half way (although vials can be filled to the
3/4 level). This ensures that the sampling probe will not come
into contact with the solid or liquid phase during the sampling
step.
The G1888 Network Headspace Sampler accepts either 10-mL or
20-mL sample vials. The Headspace Sampler can only run one
vial size at a time. See Vial Size on page 80 for details on
changing the vial size.
The vial must be sealed properly to insure that the headspace
gases do not escape prematurely. For crimp top vials, use a
crimper (Agilent part no. 9301–0720) designed for headspace
vials with 20-mm caps to seal the vials. Screw caps (Agilent part
no. 5188–2759) and screw top vials (Agilent part no.
5188–2753) are also available . See the list of consumables on
page 127.
Do the following to prepare a vial for sampling:
1 Place a septum in a vial cap with the Teflon side facing the
vial. Take care not to contaminate the septum.
2 Place the cap upside down on a table.
3 Place the sample in the vial. Most vial should not be more
than 50% full, but some vials can reach 75% full.
4 Place the septum and cap together over the vial opening.
NOTE
Sampling from an incorrectly capped vial may cause the Headspace
Sampler to jam during septum puncture.
medium_standard.book Page 90 Tuesday, February 17, 2004 10:14 AM
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