My experience with using The Ethanol Solvent to clean the Syringe in the Autosampler for the GC # 8890 with OpenLab CDS
After the injection of Samples and the use of ethanol as Solvent we found and the appearance of Peak is observed in the Chromatogram and not of samples and specifically after the Butane .
After injecting more than Samples , the same Peak appeared in the same place, and to prove this, the injection was done without ethanol as a solvent. We found that the Peak disappeared, so we learned that the beak appears as a result of using ethanol Solvent .
These were my experience with the use of ethanol Solvent and wanted to share with you
Looks like a crude oil or something like naphtha and I easily recognize the main hexane isomers.
For a naphtha I would use the sample as wash solvent, but for crude(r) material I would use mixed hexane since it is not a single component solvent, even though (also because) your sample has hexane in it any carryover will be less significant this way.
Carbon disulfide is another option for wash solvent when running naphtha or crude oil samples. It's response on FID is low compared to hydrocarbons, so there should be little to no response if some residual is in the syringe.
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