Agilent Technologies 7890A - 4 Keypad Operation; The Run Keys; The Service Mode Key; The GC Component Keys

Chromatographic Symptoms 3
Troubleshooting 37
Peak Fronting
The figure below shows examples of the three types of
peaks: symmetric, fronting, and overloaded.
If peak fronting or overloading occurs, try the following:
• Verify that the injection volume is appropriate.
• Ensure that the column is installed properly.
• Verify that the appropriate injection technique is being
used.
• If using capillary splitless injection, consider the
compound solubility in the injection solvent.
• Change the solvent.
• Use a retention gap.
• Check purity of sample solvent.
Symmetrical Fronting Overloaded