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Subject: Re: [DCHAS-L] Hazardous Fluoride Chemicals

Date: May 8, 2023 21:08 UTC

Author: Mark Ellison <mellison**At_Symbol_Here**QUALA.US.COM>

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Subject: Re: [DCHAS-L] EPA ban of methylene chloride

Date: May 9, 2023 04:29 UTC

Author: Harrison, Paul <pharriso**At_Symbol_Here**MCMASTER.CA>

From: Craig Merlic <merlic**At_Symbol_Here**CHEM.UCLA.EDU>

Subject: Re: [DCHAS-L] What we know − and don't know − about what caused UD's lab evacuation 2 weeks ago

Date: May 8, 2023 23:15 UTC

Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>

Message-ID: <77F5F4C3-984B-42E7-BCF0-B67386F46F26**At_Symbol_Here**chem.ucla.edu>

In-Reply-To: <DCB922B4-C4DA-45BB-BBB4-E74AC2D4866D**At_Symbol_Here**rstuartcih.org>

Demystify: 

Ralph,

AI vs ACS:

Since you said " I don’t think that AI’s strengths of sifting through word combinations is likely to be helpful in predicting outcomes ", I did a comparison of the Pistoia Alliance Chemical Safety Library vs ChatGPT.

Searching the ACS Chemical Safety Library (https://safescience.cas.org/ ) for acetone or hydrogen peroxide returns the statement: “Formation of acetone peroxides possible. Try to avoid combination or check for peroxides.” There is no entry for TATP.

Asking ChatGPT " Safety of mixture of acetone and hydrogen peroxide" gives:
" Mixing acetone and hydrogen peroxide can potentially be dangerous as it can result in a highly reactive mixture that is prone to spontaneous combustion. This mixture is called acetone peroxide or triacetone triperoxide (TATP) and is a powerful explosive.

Acetone peroxide can be formed when acetone and hydrogen peroxide are mixed in the presence of an acid catalyst or when they are allowed to react at high temperatures or for extended periods. This reaction can occur even with relatively dilute solutions of hydrogen peroxide and acetone.

Therefore, it is important to avoid mixing acetone and hydrogen peroxide unless you are following a specific procedure that requires their combination, and you have the necessary training and safety equipment to handle the resulting mixture safely. If you must mix them, it is crucial to follow proper safety protocols, including working in a well-ventilated area, using protective equipment such as gloves and goggles, and avoiding any sources of heat or sparks.

It is also important to note that acetone and hydrogen peroxide can each pose individual health hazards when not handled properly, such as skin irritation and respiratory problems, so it is important to handle them with care. "

So on this single test, AI seems promising.

Best,
Craig

Craig A. Merlic
Professor of Chemistry, UCLA Department of Chemistry and Biochemistry
Executive Director, UC Center for Laboratory Safety
http://cls.ucla.edu

On 5/8/23, 1:01 PM, "ACS Division of Chemical Health and Safety on behalf of Ralph Stuart" <DCHAS-L**At_Symbol_Here**Princeton.EDU on behalf of ralph**At_Symbol_Here**RSTUARTCIH.ORG> wrote:

> >How about leveraging AI/ChatGPT, Alexa, Siri, etc. to help predict the outcomes when starting with these reagents and using the described process?
>
> >Has anyone tried using one of these to predict potentially dangerous outcomes?

I know of one effort, although I don’t believe it does involves AI (depending on your definition of AI). The Purdue Reactive Hazard Evaluation Analysis and Compilation Tool can be found at
https://rheact.github.io/#/welcome
Based on the data they ask for and logic they describe there, I don’t think that AI’s strengths of sifting through word combinations is likely to be helpful in predicting outcomes.

More specfically, in addition to SDS’s, the Purdue tools walks the user through these steps:
" • Parsing multiple Safety Data Sheets (SDSs) for chemical and safety information
• Creating an operational chemical hazard matrix
• Generating a pairwise chemical compatibility matrix
• Calculating final reaction temperature after an adiabatic temperature change
• Providing PPE recommendations from SDS and PPE questionnaire
We aim for RHEACT to be a quick preliminary screening tool that alerts users about hazards and pushes them to perform further analysis.”

Given that each of these steps need to be sanity-checked to be used for safety decision-making, the data and logic requirements here don’t appear to be quick or preliminary to me.

- Ralph

Ralph Stuart, CIH, CCHO
ralph**At_Symbol_Here**rstuartcih.org

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