Unexpected N2 peak

Discussions about GC and other "gas phase" separation techniques.

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I am trying to analyze a gas sample containing CO2, H2, CH4 with RGA Agilent 6890 RGA with capillary column. However, there is also an unexpected N2 peak in the results almost every time. I am almost sure about sampling method or any air leak, since GC can analyze LPG without a N2 peak.

There is a possibility that moisture can be analyzed as nitrogen. It was observed that there was moisture in the samples, that comes from the excess water vapor doesn't react in the reactor. Although the gas sample is passed through silica jel, the unexpected peak is still there. Also our GC technician is concerned about moisture could damage the column and detectors.

Is anyone has any idea about the cause of this unexpected peak?

70% of atmosphere is N2.

It is valve leak.
2 posts Page 1 of 1

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