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Sinusoidal baseline.

Question asked by ccbarnes5 on Mar 27, 2018
Latest reply on Apr 26, 2018 by james_jenkins

We have a baseline that gives a sinusoidal wave that starts about 16 minutes.  We are using an Agilent 6850 GC with a split/splitless injector and an FID.  The inlet is interfaced to a 7679A HS.  The baseline is good up until 15.5 minutes then it starts the sinusoidal response.  This response is consistent from one run to the next.  We've baked the column per the manufacturer's instructions.  We've re-installed the column on the detector end and put in a new inlet liner.  Any ideas? 


chromatogram with sinusoidal baseline.jpg