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Subject: [DCHAS-L] Remembering Ralph
Date: Feb 29, 2024 22:37 UTC
Author: Robin M. Izzo <rmizzo**At_Symbol_Here**Princeton.EDU>
Subject: Re: [DCHAS-L] School Incident with Dry Ice
Date: Feb 29, 2024 22:50 UTC
Author: David EldrEdge <Dave.EldrEdge**At_Symbol_Here**NALTIC.COM>
From: Info <info**At_Symbol_Here**ILPI.COM>
Subject: Re: [DCHAS-L] School Incident with Dry Ice
Date: Feb 29, 2024 22:43 UTC
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID: <A1E658C7-C9C5-464B-A69B-684B560087D8**At_Symbol_Here**ilpi.com>
In-Reply-To: <CAGtjs7G4U3DkSXs4nH3UWYh1KCqwZBga9YamR9Q6qA6kk=VPOg**At_Symbol_Here**mail.gmail.com>
On Feb 29, 2024, at 5:05 PM, Amber Wise <amber.wise**At_Symbol_Here**GMAIL.COM> wrote:Seeing as how dry ice is more dense than air and small children breathe closer to the floor, I could envision a closed room "filling up" with CO2 gas and pushing out adequate oxygen for them.some back of the envelope calculations (I hope I got all my unit conversions?.....it's been awhile since I've taught undergrads chemistry) for a 10x10x3.5 meter room, the lower half of the room's volume is 170,000 Liters.If half of a 10 pound block of dry ice sublimates (5lbs) = 51.6 moles = 1240 Liters of CO2 (using ideal gas law and room temp). That looks to me like 0.7% by volume. According to some quick googling, those levels are dangerous and can lead to dizziness, nausea and worse.--- For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.orgOn Wed, Feb 28, 2024 at 8:35 AM Info <info**At_Symbol_Here**ilpi.com> wrote:--- For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.orgI can’t think of any scenario with dry ice in this situation that would have caused this. You’d have to a significantly elevated level to feel something, at least 2,000 to 5,000 ppm, and the amount of CO2 you can bring into a classroom is what, a couple of pounds? The room would have to be hermetically sealed or you’d have to be huffing the stuff.There’s either something massively left out of this story or it’s a case of chemophobic mass hysteria (guess that’s called mass psychogenic illness these days given the misogynistic origin/premise of the word hysteria). See, for example, https://www.aafp.org/pubs/afp/issues/2000/1215/p2655.html and https://www.verywellmind.com/understanding-groupthink-2671595Similar reports have been seen in the literature, https://pubmed.ncbi.nlm.nih.gov/10631279/ and there have been cases of MPI reported at vaccination centers as well https://pubmed.ncbi.nlm.nih.gov/12814329/Rob Toreki======================================================Safety Emporium - Lab & Safety Supplies featuring brand namesyou know and trust. Visit us at https://www.SafetyEmporium.comesales**At_Symbol_Here**safetyemporium.com or toll-free: (866) 326-5412Fax: (856) 553-6154, PO Box 1003, Blackwood, NJ 08012
On Feb 24, 2024, at 7:30 PM, Monique Wilhelm <biocmst**At_Symbol_Here**GMAIL.COM> wrote:--- For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.orgI do not have any additional details. Although I do suggest anyone working with hazardous materials with groups (or otherwise) to do a risk assessment and have appropriate controls in place as well as plans for any incidents that could occur.
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