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From: Stuart, Ralph <Ralph.Stuart**At_Symbol_Here**KEENE.EDU>
Subject: Re: [DCHAS-L] benchmarking O2 monitoring with cryogen use
Date: Jun 2, 2021 18:28 UTC
Reply-To:
ACS Division of Chemical Health and Safety
In-Reply-To:
> >In my experience, except for very small laboratories, or those with very low exhaust rates (like SEM labs) oxygen monitoring is not required unless the owners try to stack a 10 day supply of cryogens on hand at all times.
Or if they are storing dry ice or liquid nitrogen in a cold room, assuming that that location will extend the life of their stockpile of those items. (Fresh air in cold rooms is 0%.) We have found 16% O2 levels in those situations.
- Ralph
Ralph Stuart, CIH, CCHO
Environmental Safety Manager
Keene State College
603 358-2859
ralph.stuart**At_Symbol_Here**keene.edu
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