From:
Pereira Hicks, Cristiane <pereir10**At_Symbol_Here**MSU.EDU>
Subject:
Re: [DCHAS-L] Peroxide strips and 2-propanol
Date:
Oct 3, 2025 22:18 UTC
Reply-To:
ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID:
<DS7PR12MB8250BE0AEC5817F3E2BABDECD3E4A**At_Symbol_Here**DS7PR12MB8250.namprd12.prod.outlook.com>
In-Reply-To:
<CAOCg_ca7=fRTk3Q_rfa-awZufUtffZa+m1OYhds_gqoKGjv8vQ**At_Symbol_Here**mail.gmail.com>
You should take a look at this publication:
From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> on behalf of Laurie Yoder <000022a100962bdc-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>
Sent: Friday, October 3, 2025 12:45:50 PM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Subject: [DCHAS-L] Peroxide strips and 2-propanol
I am doing a chemical hygiene independent study course with a student, and (mainly for educational purposes) we tested our 2-propanol in the stock room with peroxide test strips. There was an intense unmistakable color change, which seemed surprising given
that the containers are less than 1 year old. My question is if others of you with more experience have gotten positive tests like this--can it really contain that much peroxide or is there some other interference happening with the test strips?
- The brand is "WaterWorks", not expired.
- The strip was dipped in the 2-propanol, extra drips removed, then a drop of DI water was added to the strip.
- We also tried it in reverse-adding the water first, then dipping. Same result.
- Other organics tested in this way did not indicate any peroxides.
We don't distill the stuff so I'm not overly concerned, mainly curious. What's happening?
Laurie
--
Laurie M. Yoder, PhD (she,her)
Schedule
an appointment here
Associate Professor of Chemistry and Chemical Hygiene OfficerFaculty
Athletics RepresentativeEastern Mennonite University
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