Thermo Scientific TRACE GC Ultra Maintenance And Troubleshooting Manual page 398

Chapter 19
Analytical Troubleshooting
Behavior Characteristics
Tailing Sample peaks
Tailing Solvent peak
Unresolved peaks
398
Cause
Glass wool or inlet liner
causing activity
Inlet temperature too low
Poor or obstructed column
connections
Wrong stationary phase
Incorrect column position
in inlet
Initial oven temperature too
high (On Column)
Septum purge flow too low
and/or split/splitless vent
flow too low
Too large injection size
Carrier gas flow rate too
high
Column deteriorated
Column temperature too
high
Column too short
Incorrect column choice
Injection technique is not
adequate
Remedy
Replace with fresh silanized
wool and a clean inlet liner.
Increase the inlet temperature
Remake the column inlet
connection.
Replace the column according to
the column manufacturer
literature.
Reinstall the column.
Reduce the initial oven
temperature.
Check and adjust the septum
purge and vent flows.
Reduce the injection size.
Reduce the carrier gas flow rate
Replace the column
Lower the column oven
temperature
Use a longer column
Install a suitable column
Choose a correct injection
technique
Maintenance and Troubleshooting Manual
Peaks