Transcription of Agilent GC troubleshooting guide poster
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Agilent GC troubleshooting guide poster
= inR = = inPeak widthAll Peaks Some Peaks SymmetricalFrontingOverloadClean Blank Run(no injection)Ghost CauseSolutionCommentsContaminants introduced with sampleSample or solvent cleanupContaminants in sample process or solventInlet contaminationClean the injector, replace liner, gold seal, and septumTry a condensation test; gas lines may also need cleaning. Take steps to prevent sample backflush (reduce injection volume, lower inlet temperature, use larger volume liner)Septum bleedReplace septumUse a high-quality septum appropriate for the inlet temperatureContamination of sample before introduction to the GCCheck sample handling steps for potential contamination sources: sample cleanup, handling, transfer, and storageUsually occurs after changing a gas cylinderSemivolatile contamination (peak widths will be broader than sample peaks with similar retention )Bake-out column.
Solvent-phase polarity mismatchChange sample solvent to a single solvent More tailing for the early eluting peaks or those closest to the solvent front Use a retention gap 3 to 5 meter gap is sufficient Solvent effect violation for splitless or on-column injections Decrease the initial column temperature Peak tailing decreases with retention
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