Chromatography Forum

Greetings,
I am relative new to ion chromatography and have a number of instruments I am responsible for. I am seeing a slight downward trend in my baseline on one instrument and a slight upward trend on a different instrument. They have been equilibration for a few hours and I am not sure what is the cause. I am running anion analysis with a carbonate/bicarbonate eluent and dilute sulfuric acid regen.

Any thoughts welcome

Please specify the drift in µS/h.
Slight drift may be seen due to temperature change. Therefore it no guidance is possible without knowing details about the system (column oven, detector stabilization, lab temperature (fluctuations)).