Balaji,

A gas-chromatograph or mass-spectrometer would be useful in this case - the GC would enable large molecular species to be identifed, and the MS would be more appropriate for lighter (cyanide, for example, rather than phenol) compounds.

Thanks Garry

Dear Dr. Balaji Babu,

I agree with Dr. James Garry. Another alternative would be the use of a thermogravimetric chamber coupled to a mass spectrometer (TG/MS). It would be suitable if your sample is not complex, and you could relate the TG signals with the immediate MS detection.

Greetings!

Dear Balaji

We can do the analysis for residue in gas sample by TDS with GCMS. By this technique you can detect the residue at very low level.

Thanks and regards

Indrajit Sen

Thanks all.