From:
Monona Rossol <actsnyc**At_Symbol_Here**cs.com>
Subject:
Re: [DCHAS-L] demolition of lab with osmium tetroxide contamination
Date:
Aug 5, 2013 22:37 UTC
Reply-To:
DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID:
8D0604378CED8F5-91C-2E5BF**At_Symbol_Here**webmail-d214.sysops.aol.com
In-Reply-To:
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>
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
======================================================
Safety Emporium - Lab & Safety Supplies featuring brand names
Fax: (856) 553-6154, PO Box 1003, Blackwood, NJ 08012
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
