Separating peaks

Hello. Probable if you reduce the flow or/and temperature rise, you will solve the problem, did the column length remain the same? Did you switch columns brands?

I would like to know the results of those actions, if you decide to follow
Marius

Thank you to Marius Grisaru for providing this response to LabWrench

What concentration levels are you at? Is this %, ppm, ppb? What column type are you using?

Thank you to Geoffrey Faden for providing this response to LabWrench

What types of column you use? Did you perform a proper activation of the new column before use?

Thank you to Mahmoud Kassem for providing this response to LabWrench

Typically the only material that will separate oxygen and nitrogen is a zeolite called molecular sieve. Typically 1-2 metre 1/8" packed column lengths are used connected to a TCD.

It requires re-activation after being removed from the GC. Typically conditioning temperaturres of 250C - 400C have been used in the past to remove the water which causes the deactivation. The temperature used is dependent on the zeolite and more importantly whether you are looking for CO.

Please note CO2 can not be eluted from molecular sieve.

Thank you to Gary Rawlinso for providing this response to LabWrench

I used the same brand for the column and the length remain the same.

I will try reducing the flow and increase the temperature, and will let you know.

The column temperature was normally ran at 60 degree C before the column change.  Then reduced to 50 degree C per the vendor, but it did not work.

Thank you for your suggestion.

Tramanh Michalak

The analysis result is in % and 1/8" packed column.

Thank you

1/8" packed column and condiditon at 300 degrees for 24 hours per the direction at 30ml/min flow

testing

The reduction of flow and increase the temperature will not solve, try to reduce the temperature to 40DC and try to check the exact flow rate, may be higher than recommended.

Thank you to Mahmoud Kassem for providing this response to LabWrench