Questions in Gas Chromatography (GC)
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Peak area variability in DMSO analysis
Hello, I am running an impurity analysis method for DMSO with the following parameters: FID Temperature: 250 °C Injector Temperature: 250 °C Column...
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Unexpected Peaks After Running a Solvent Blank
I was running a sequence of product samples and decided to inject a methanol blank in between. To my surprise, I saw unexpected peaks—some of which ...
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Retention Time Shifts Mid-Run
In a long GC run (about 30 samples), I noticed that retention times started shifting gradually. Early samples were fine, but later ones drifted....