Tailing/Rising Baseline.

[jtsmith]

I am currently running VOC's using the 8260 EPA method. At the upper temperature limits of the run, a tailing effect begins to take place in the baseline, (just after BFB). I suspected a column bleed, but clipping the column did not work. This is a new column.

I checked for a leak but have less than 1 percent nitrogen and significantly less Oxygen, Ar etc.

Any suggestions on what could be the problem would be much appreciated.


If it would help to see an attached chromatogram let me know.

[pueblito]

Is it in SIM or SCAN mode?

[jtsmith]

I am running in scan mode.