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Annoying regular ghost peaks?

Question asked by dmarchini on May 31, 2018
Latest reply on Jun 1, 2018 by bigbear

Hi guys, I'm experiencing regular times ghost peaks starting at 120°C to 295° setup is GC-FID 6890, Low pressure drop, Ultra Inert Liner with glass wool, column HP1 widebore.....


I have cutted the inj/det 5 inches of column, heated at 295°C with 1mL/min Nitrogen flow, changed the liner...but nothing has changed.


The column is new, I only injected few samples of "ketones" in acetone.


The analysis below is a vial of HEXANE; I have those regular ghost peaks injecting acetone or acetonitrile as well.


What I have to do?ghostpeaks.jpg