Chromatography Forum

Posted: **Fri May 31, 2013 5:16 am**

Dear sir,
I have a question for different detector's quantification results.

Now,
I have tedlar bag sample(it included BTEX gas with 10ppbv(N2 dilution))
We have GC/MS and GC/FI(GC/PID) system to analyze sample.
Concentrations will be calculated as toluene equivalents.

For GC/MS, we have thermal desorption/GC/MS. First i will collect air for 10minutes using accurate MFC into Tenax tube.
For GC/FID, we have cold trap before GC column.

Total concentrations are same if I use three different detectors?

I’m looking forward to hearing from you soon.
Jaehwan Lee

Posted: **Fri May 31, 2013 7:38 am**

As long each system is properly calibrated (in terms of response vs amount) then they will all give the same result.

Peter

Posted: **Fri May 31, 2013 7:49 am**

Thank you for your kindly reply.

I will let you know our results after try it.
Best regards.
Lee

Posted: **Sat Jun 01, 2013 10:38 am**

Are you able to go down to the lower limits required by law for BTEX using an FID detector?

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