Chromatography Forum

I was using the GC-NPD for testing of acrolein samples. However,the chromatogram of the blank is one with the solvent peak and another peak that resembles a big "leap" which leads to drifting of the baseline.

I had seen past examples of the similar samples ran by other analyst using the same method and same GC-NPD yet with beautiful symmetric peaks shown on the chromatogram.

I am unsure if the problem I have is due to the sensitivity of the NPD detector or due to my bad sample preparation....

I will really appreciate it if someone can have some idea regarding this.

Thank you.

Regards,
seohua

What are your method parameters such as: Column type, injection temperature, oven program, solvent, carrier gas and flow rate?

Many different things can cause problems, we need more information to help trouble shoot this one.