1
Getting Familiar with Your TriPlus RSH
MHE Station
54
TriPlus RSH User Guide
Thermo Scientific
If the MHE quantification is based on gas standards that are subjected to the same MHE
extraction sequences as the actual samples, there will be no overestimation. The amount
calculated will be correct.
References
For more details, please refer to the corresponding publication on the static headspace
technique and, in particular, on the MHE technique.
Title: ‘Static Headspace-Gas Chromatography – Theory and Practice’
A
uthors: Bruno Kolb and Leslie S. Ettre, Second Edition.
Published by: John Wiley & Sons, Inc.
MHE Cycle Step-by-Step
This section details the basics steps for a routine operation of the MHE station.
1. The sample vial is placed into the Agitator and the equilibrium is established.
Time and temperature are controlled. See
A
in
2. The vial is pressurized by inserting the headspace syringe needle 22 mm into the vial.
The purge gas is activated for a fixed time of 30 seconds. See
B
3. The Headspace Syringe Needle is withdrawn from the vial. The gas purge valve is shut off
after withdrawal. See
C
4. A sample aliquot is taken up into the syringe according to the sample volume defined in
the sample list. See
D
.
5. The sample aliquot is injected into the GC. See E in
6. The Injection Unit moves the MHE Adapter from the Adapter Holder to the sample vial
in the Agitator. See
F
in
7. The MHE Adapter needle is inserted into the vial (14 mm).
The pressurized gas is vented to the atmosphere. See
G
in
.
8. The MHE Adapter is removed from the sample vial and positioned back into the MHE
Adapter Holder.
9. The sample vial will equilibrate to the same conditions as applied in Step 1.
This cycle is repeated as often as defined by the MHE Counter method variable.
See
H
.
10. After this cycle has been completed, the sample vial is transported back to its original
position in the Rack. The next sample is placed in the Agitator and the cycle will be
repeated.
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