Measuring Very Dilute Concentration (<0.5%)

Hi everyone,

Our lab recently purchased a microGC 990 (it has a TCD detector) with an OpenLab software. We want to measure CO2 concentration in ambient air (<500 ppm or <0.05%). We have the PORAPLOT U column.

Can this very dilute concentration be measured by adjusting some parameters? I tried increasing injection time; that seems to help. Are there any other parameter(s) that I can play with?

I'm thinking of playing with injection temperature, and column temperature.

Any suggestion or advice would be much appreciated.

Thank you

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