6
Analytical Troubleshooting
Headspace Technique Points Regarding Chromatographic Effects
Thermo Scientific
TriPlus RSH User Guide
231
Sample peaks or responses are not
reproducible (
continued
)
Back pressure of GC column too high. Check the back pressure of the GC column.
If the pressure is too high the electronic flow
control device (EPC or EFC) of the GC could
get in overload at the moment of sample
injection. This will lead to uncontrolled
opening of the split valve until the pressure
falls back into a controllable range.
Peak distortion or tailing.
Method Parameters.
See recommended previous actions.
Needle penetration speed in GC
Injector.
Check the parameter for injection technique.
If all changes give no positive result, check the
Injector Depenetration Speed
.
Solvent not suitable for application.
Check the boiling point of the solvent and try
to change the solvent (when e.g. a high boiling
point organic solvent is used as matrix).
GC Injector liner not suitable.
Check the liner geometry.
GC related parameters.
Any parameter such as the injector, oven or
detector temperature can contribute to bad
peak shape. Check the column type and
connections (square cut connections).
Excessive carry-over between samples.
Dirty syringe.
Increase method value
Syr Purge
.
Set the value of the method parameter Syringe
Temp 10 °C above the Agitator temperature,
Incubation Temp
.
None or too low Syringe Purge gas
pressure.
Check pressure at purge gas regulator (0.5 bar;
7.25 psig; 50 kPa) during
Syringe Purge
period.
Check gas purge flow at syringe needle tip.
Unexplained chromatographic peaks.
Dirty purge gas.
Check the purge gas supply for impurities.
Faulty temperature
read-out.
e.g. value: -99 °C.
HS-syringe cartridge (holder)
temperature heater, over temperature
fuse or sensor broken.
Agitator temperature heater, over
temperature fuse or sensor broken.
SPME Fiber Conditioning Module
temperature heater or sensor broken.
ITEX syringe cartridge (holder)
temperature heater, over
temperature fuse or sensor broken.
ITEX Trap temperature heater or
sensor broken.
Contact your Thermo Fisher Scientific
representative.
Table 97.
Headspace Technique Points Regarding GC Effects - Troubleshooting Guideline (Sheet 2 of 2)
Symptom or Error Message
Possible Cause
Recommended Action
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