Addendum to PAL User Manual Installation and ... - PAL System

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3. Quantification of ITEX Technique
Addendum to PAL System User Manual
PAL ITEX-2 Option
The quantification of results obtained from the ITEX technique is based on
the same principles as for static headspace or any other sample enrichment
technique such as SPME, for example.
In the case where analyte(s) is (are) combined with matrix, it is important to
be able to have the calibration standard in the same matrix environment.
Since the ITEX technique could be considered a dynamic headspace
technique, the lack of identical or missing matrix could be compensated for
by performing an exhaustive extraction. Be aware that such a compromise
must be validated very carefully.
4. Available Trap Material
The standard trap material shipped with a PAL ITEX-2 Option is:
• Trap material: Tenax TA
• Mesh size: 80/100
• Fill volume: 44 mg
• Bed length: Approx. 36 mm
• Positioning inserts: Silanized glass wool
• Upper temperature limit: 350 °C
• Trap/Needle material: stainless steel, inside wall neutral deactivated for
analysis of, e.g. organo-sulfur compounds
See also Appendices; Section 3, ‘PAL ITEX Option Spare Parts’,
point 3.3. ’Ordering Information for Custom Traps’.
5. Cleaning the Trap
Safety Warning:
Do not touch the surface of the Trap Heater during operation. The surface
temperature can reach potentially harmful levels when operated at high
desorbing or cleaning temperatures.
The Trap surface can reach approx. 270 °C if operated at the maximum
trap temperature of 350 °C.
It is advisable to clean a trap initially to eliminate all volatile contaminants.
Use the provided Cycle Composer macro ‘ITEX2_CleanTrap’.
A practical check is to run a blank injection, monitor the detector baseline
to check for sufficient cleanness of the trap.
Observe the maximum operating temperature for the trap material.
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