Date: Wed, 28 Apr 2010 21:04:36 -0400
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: ILPI <info**At_Symbol_Here**ILPI.COM>
Subject: Re: Formaldehyde filtration
In-Reply-To: <48A020E1942E024DB0F2A6B68A13124407FC941F43**At_Symbol_Here**>

You want a simple irreversible chemical reaction, not just (reversible) chemisorption.

Never done it for the purpose you describe, but a gas trap or drying tower with a solid material such as permanganate on activated alumina should probably work.   Give these guys a call and see what agent they recommend: /products/media.aspx 

My company sells gas drying tubes/towers: and you can find similar items at Fisher Scientific, VWR etc.

Rob Toreki

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From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**LIST.UVM.EDU] On Behalf Of Ringen, Sonja G.
Sent: Wednesday, April 28, 2010 2:48 PM
To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
Subject: [DCHAS-L] Formaldehyde filtration
We have a researcher who would like to occasionally vent small quantities (micrograms/cubic meter; maybe less) of formaldehyde from a vessel being developed to measure greenhouse gases.  Because the vessel sits on a laser table, and there is no fume hood in the laboratory, we are hesitant to tell him to vent it into the room (especially since the building is old and there is very little turnover of the air in the room).  I=92d like to find a filter for the exhaust before it goes outside, but have had trouble finding an effective filter.  I know that activated charcoal is not very effective for such a small molecule.
What do you use to filter formaldehyde from exhaust?
Sonja Ringen
Office of Safety, Health and Environment
325 Broadway, MC 173.02
Boulder, CO  80305
Phone: 303.497.7389
Mobile: 303.961.9251

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