From: Laurence Doemeny <ldoemeny**At_Symbol_Here**COX.NET>
Subject: Re: [DCHAS-L] demolition of lab with osmium tetroxide contamination
Date: Mon, 5 Aug 2013 17:41:13 -0700
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: 002701ce923d$a7816ae0$f68440a0$**At_Symbol_Here**net
In-Reply-To <9Alv1m00v1tyVfQ01AlyDR>

While osmium tetroxide is still a solid at room temperature its vapor pressure at 20 =B0C is 7 mm Hg. Substantial if OsO4 is present.


From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of Monona Rossol
Sent: Monday, August 05, 2013 3:37 PM
Subject: Re: [DCHAS-L] demolition of lab with osmium tetroxide contamination


I agree with Rob.  Osmium tetroxide  has a TLV TWA of 0.0002 ppm or 0.0016 mg/m3.   You have no choice but to use air-supplied. And I just looked at 3M cartridge information and Supplied Air is their recommendation.   And since OS4 still a solid at room temperature (MP 104 F  - 40 o C) there really could be stuff lurking there depending on conditions.

Monona Rossol, M.S., M.F.A., Industrial Hygienist

President:  Arts, Crafts & Theater Safety, Inc.

Safety Officer: Local USA829, IATSE

181 Thompson St., #23

New York, NY 10012     212-777-0062



-----Original Message-----
From: ILPI Support <info**At_Symbol_Here**ILPI.COM>
Sent: Mon, Aug 5, 2013 5:20 pm
Subject: Re: [DCHAS-L] demolition of lab with osmium tetroxide contamination

Not an expert at that, but for the hood I'd go with a full face supplied air respirator.  While it's unlikely there is anything volatile remaining, OsO4 attacks the corneas and I would not rely on a cartridge which probably has not been tested against Os4.


Rob Toreki



Safety Emporium - Lab & Safety Supplies featuring brand names

you know and trust.  Visit us at

esales**At_Symbol_Here**  or toll-free: (866) 326-5412

Fax: (856) 553-6154, PO Box 1003, Blackwood, NJ 08012


On Aug 5, 2013, at 3:29 PM, Ellen M. Sweet <ems325**At_Symbol_Here**CORNELL.EDU> wrote:

Hi everyone,

I'd like to know if anyone has dealt with the demolition of a lab and removal of a fume hood in which osmium tetroxide was used? Other than recommending respiratory protection (N100 or P100 cartridges), nitrile gloves and coveralls during tear-out, are there any other precautions we should keep in mind?

Thanks for any suggestions.



Ellen Sweet

Laboratory Ventilation Specialist

Department of Environmental Health and Safety

Cornell University




Previous post   |  Top of Page   |   Next post

The content of this page reflects the personal opinion(s) of the author(s) only, not the American Chemical Society, ILPI, Safety Emporium, or any other party. Use of any information on this page is at the reader's own risk. Unauthorized reproduction of these materials is prohibited. Send questions/comments about the archive to
The maintenance and hosting of the DCHAS-L archive is provided through the generous support of Safety Emporium.