1
Getting Familiar with Your TriPlus RSH
ITEX-2 Tool
30
TriPlus RSH User Guide
Thermo Scientific
ITEX-2 Tool
The ITEX-2 tool consists of a dedicated gas-tight syringe with an adapter for a replaceable
side-hole needle and a heated syringe cartridge. The side-hole needle includes an integrated
trap (standard trap material is Tenax® TA) and a trap desorber heater. See
.
Figure 18.
ITEX Tool
Note
The ITEX-2 tool performs enrichment of volatile or semi-volatile compounds
during headspace analysis. ITEX can be considered an automated dynamic headspace
technique. In classical headspace technique, one sampling is done per vial. In this device,
analytes are adsorbed (loaded) on a sorbent trap contained within a side-hole needle
attached to a gas-tight syringe. Following this loading procedure, analytes are thermally
desorbed and led directly into the GC injector, then analyzed by the required technique,
mainly using GC/MS detection. Loading takes place by continuously moving the
headspace syringe plunger up and down as a pump, passing the headspace gas phase that
exists above a sample through the sorbent trap inside the needle numerous times.
The cycle of the ITEX-2 tool consists of four steps:
1. The sample vial is placed into the Agitator and the equilibrium is established (time
and temperature controlled).
2. The sample is loaded on the trap by continuously pumping the syringe plunger up
and down.
3. Thermal desorption of analyte directly into the GC injector.
4. The Trap material is cleaned with inert gas, Trap Cleaning Time/Flush Time.
The Trap temperature can be raised for the cleaning step.
Contacts for ID, Heater and
Heater Control, Fan, and Fan
Control
Plunger for ITEX
Syringe
ITEX Syringe
Barrel
ITEX Trap
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