Cl2 by direct gas chromatography

[DTM]

I am looking for a method for the direct analysis of chlorine gas (low level 0-3 ppm)in air/N2 by GC. I've found some indirect methods (derivatization) utilizing HPLC and Spectrophotometry but they have interference issues.

Regards,

Dan

[AICMM]

DTM,

Chlorine has an IP of 11.5 so the best way I can think of to do ppm levels is by helium ionization detector. I make one, Valco makes one and Gow Mac makes one. An argon PID probably won't get you down to ppm levels considering the IP of chlorine. I will ask a friend of mine what column he would recommend as he does this analysis at higher levels by TCD. As with a TCD, using the HID means that you will have to get good separation from the air peak.

Best regards.