From: Monona Rossol <actsnyc**At_Symbol_Here**>
Subject: Re: [DCHAS-L] demolition of lab with osmium tetroxide contamination
Date: Mon, 5 Aug 2013 18:37:17 -0400
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: 8D0604378CED8F5-91C-2E5BF**At_Symbol_Here**
In-Reply-To <3C2BD305-E3B1-4BC1-BE7A-087348E8338F**At_Symbol_Here**>

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

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