Increased Response on Agilent 7890 with u-ECD detector

Hello, I have a Agilent 7890 GC with a micro ECD detector. We had a sudden (overnight) increase in response. We are currently using the instrument to analyze inorganic chlorides. We have a PTV inlet. Have already changed the syringe and the liner. No apparent ghost peaks or other obvious contamination. Looking for possible suggestions.


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