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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.

http://www.chemistry.ucla.edu/sites/default/files/safety/sop/SOP_Osmium_Tetroxide.pdf


 

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
To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
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

actsnyc**At_Symbol_Here**cs.com   www.artscraftstheatersafety.org


 

-----Original Message-----
From: ILPI Support <info**At_Symbol_Here**ILPI.COM>
To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
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

 

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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

 

Ellen Sweet

Laboratory Ventilation Specialist

Department of Environmental Health and Safety

Cornell University

315-730-8896

 

 

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