Date: Fri, 30 Apr 2010 10:02:23 -0400
Reply-To: Don Wanamaker <dwanamaker**At_Symbol_Here**>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: Don Wanamaker <dwanamaker**At_Symbol_Here**EMLWEB.COM>
Organization: Environmental Management, Ltd.
Subject: Re: Formaldehyde filtration

Was the reason for a Big Carbon Bed (>12") due to high humidity or the concentration of the formaldehyde?
If I remember correctly, carbon beds are hydrophilic.  Using another media (which can also be regenerated) in a high humidity atmosphere is something that I've been shopping for... to capture low level VOCs used in cosmetics.
Don Wanamaker
Environmental Management, Ltd.
(888) 4-EMLWEB or (888-436-5932)
----- Original Message -----
From: Debbie M. Decker
To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
Sent: Wednesday, April 28, 2010 7:26 PM
Subject: Re: [DCHAS-L] Formaldehyde filtration

Big Carbon Bed - several inches thick.  We=92ve had good luck with downdraft necropsy tables that run the exhaust through a really thick carbon bed - >12=94, if memory serves.  We were able to show that the formaldehyde was captured on the carbon bed using an exposure dosimeter, both in the air stream out of the filter and on the humans in the space.

Hope this helps.



Debbie M. Decker, Campus Chemical Safety Officer
Environmental Health and Safety
University of California, Davis
1 Shields Ave.
Davis, CA  95616
(530)754-7964/(530)752-4527 (FAX)
Co-Conspirator to Make the World A
Better Place -- Visit and join the conspiracy

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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