Don:
Had more to do with the amount of formaldehyde to be scaveng ed. This was human anatomy class and even though the cadavers had been rinsed, the formaldehyde was still present.
We’re in Northern California, in the northern Sacramen to Valley – we’re lucky if the humidity gets over 40% RH! A really humid da y is 50% RH and we’re all whining about sweltering. So hydrophilicity isn’ ;t a problem.
The anatomy class has been moved into a new facility with do wn draft tables that are exhausted to the outside.
Hope this helps,
Debbie
----------------------
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)
dmdecker**At_Symbol_Here**ucdavis.edu
Co-Conspirator to Make the World A
Better Place -- Visit www.HeroicS
tories.com
and join the conspiracy
From: DCHAS-L Discu
ssion
List [mailto:DCHAS-L**At_Symbol_Here**LIST.UVM.EDU] On Behalf Of Don Wanamaker
Sent: Friday, April 30, 2010 7:02 AM
To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
Subject: Re: [DCHAS-L] Formaldehyde filtration
Debbie,
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 medi a (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.
djw
Don
Wanamaker
Environmental Management, Ltd.
(888) 4-EMLWEB or (888-436-5932)
----- Original Message -----
From: Debbie M. Decker
Sent: Wednesday, Apr il 28, 2010 7:26 PM
Subject: Re: [DCHAS-L] Formaldehyde filtration
Big Carbon Bed – several inches thick. We’ ve had good luck with downdraft necropsy tables that run the exhaust through a really thick carbon bed - >12”, if memory serves. We were able to show th at the formaldehyde was captured on the carbon bed using an exposure dosimeter, bo th in the air stream out of the filter and on the humans in the space.
Hope this helps.
Debbie
------------------------
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)
dmdecker**At_Symbol_Here**ucdavis.edu
Co-Conspirator to Make the World A
Better Place -- Visit www.HeroicS tories.com and join the conspiracy
From: DCHAS-L Discu ssion 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’d like to find a filter for the exhaust before it goes outside, but have had trouble finding an effective filter. I know that activat ed 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 p>
NIST/Boulder
325 Broadway, MC 173.02
Boulder, CO 80305
Phone: 303.497.7389
Mobile: 303.961.9251
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