What trap temperature should I use? I've always used the default of 150C.
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Sunday, May 4, 2025 9:42:59 AM
What ion trap temperature should I use for temp of electrodes?
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- Moderator
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This will depend on what application you are running and what model of ion trap you have.
For all internal based ionization systems - including 220, saturn 2x00 and internal 240, the temperature of the trap will effect chromatography. Heavy, late eluting compounds with high boiling points for GC/MS will tend to tail at lower temps. This especially tru for high boiling, polar compounds. A good rule of thumb is to look at the later eluting compounds. If you are seeing peak tailing try raising the temp 25-50C. If the peak shap improves, then increase further until you are happy with peak shape. If peak shape does not improve with temp, then it makes not sense to increase temp, in fact, for ion traps, the lower the temperature the better. Compounds with weak molecular ions in EI, such as hydrocarbons, show better molecular ion intensity that help out with compound identification.
For external based systems - 240 and 4000 external mode ion traps, the trap termperature is not as important. On these systems, the temperature of the exteral source because very important. Generally you will see improvements of peak tailing by increasing the source temp, not the trap temperature. On these system you can most always use 150C or lower
For all internal based ionization systems - including 220, saturn 2x00 and internal 240, the temperature of the trap will effect chromatography. Heavy, late eluting compounds with high boiling points for GC/MS will tend to tail at lower temps. This especially tru for high boiling, polar compounds. A good rule of thumb is to look at the later eluting compounds. If you are seeing peak tailing try raising the temp 25-50C. If the peak shap improves, then increase further until you are happy with peak shape. If peak shape does not improve with temp, then it makes not sense to increase temp, in fact, for ion traps, the lower the temperature the better. Compounds with weak molecular ions in EI, such as hydrocarbons, show better molecular ion intensity that help out with compound identification.
For external based systems - 240 and 4000 external mode ion traps, the trap termperature is not as important. On these systems, the temperature of the exteral source because very important. Generally you will see improvements of peak tailing by increasing the source temp, not the trap temperature. On these system you can most always use 150C or lower
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