Page 1 of 1
Free formaldehyde by GC-MS!!?
Posted: Thu Feb 05, 2009 9:58 pm
by berettagtz
Is it possible to see formaldehyde by gc ms without derivatization?
If it is, what are the conditions (columns, etc)?
Posted: Fri Feb 06, 2009 3:53 am
by AICMM
I don't know if by MS but it is doable by GC with the right detectors. I will look in my notes to see what column was used.
Best regards.
Posted: Fri Feb 06, 2009 4:28 am
by berettagtz
Thanks for the reply. GC alone is fine, as long as formaldehyde doesn't need to be derivatized.
Also, how can one obtain formaldehyde in a gaseous state? What kind of containers are used?
Thanks.
Posted: Fri Feb 06, 2009 9:16 am
by krickos
Also, how can one obtain formaldehyde in a gaseous state? What kind of containers are used?
Thanks.
Hi
Have limited experiance of this but seems to recall from the university that we used a diffusion sampler (passive sampling) imprignated with 2,4-dinitrophenylhydrazine. The reaction product was analyzed with HPLC.
Sorry have no further details
Posted: Fri Feb 06, 2009 1:18 pm
by AICMM
berettagtz,
Still don't know what column but I will continue looking. Regarding formaldehyde in gaseous state, I would start with the permeation tube manufacturers like Kin-Tek or Valco. You can also make it from paraformaldehyde once you heat it. Controlling the concentration will be the challenge in that scenario. If I am not mistaken, I think someone made a perm tube of paraformaldehyde and controlled the concentration by how much they heated it.
More to come.
Best regards.
Posted: Fri Feb 06, 2009 5:17 pm
by berettagtz
Thank you for your replies. So far I haven't found any company that sells formaldehyde in a pure gaseous state. As far as the column goes I may have found a GC column from sigma aldrich.
Posted: Fri Feb 06, 2009 5:19 pm
by JI2002
Thank you for your replies. So far I haven't found any company that sells formaldehyde in a pure gaseous state. As far as the column goes I may have found a GC column from sigma aldrich.
Try Scotty and Entech
Posted: Fri Feb 06, 2009 6:08 pm
by berettagtz
Thank you for your replies. So far I haven't found any company that sells formaldehyde in a pure gaseous state. As far as the column goes I may have found a GC column from sigma aldrich.
Try Scotty and Entech
Would you happen to have a website?
Posted: Mon Feb 09, 2009 2:28 pm
by JI2002
Posted: Mon Feb 09, 2009 10:40 pm
by AICMM
berettagtz,
I found the reference. It was a poster presented at PittCon by Air liquide. They used a standard in nitrogen that they had prepared at about 20 ppm. they used a 0.53 id RT-QPlot column, 30 meters long with an Agilent GC-Ms. I am not sure how they married 0.53 flow to a MS since they don't say anything in the poster. They also did it by GC HID with a 10M mol-sieve and a 50 mtr PorabondQ column but they don't discuss how configured. For this, they used a perm device from "Calibrage?" (I am assuming a French perm tube maker....)
Best regards.