From:
Joel Thompson <ironjt81**At_Symbol_Here**GMAIL.COM>
Subject:
Re: [DCHAS-L] Peroxide strips and 2-propanol
Date:
Oct 4, 2025 16:39 UTC
Reply-To:
ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID:
<CAOFLRuZzdd2b926DbLRcKm2m6o7Hamj_WTWD+=JjmN4Pd1FWmw**At_Symbol_Here**mail.gmail.com>
In-Reply-To:
<CAOCg_ca7=fRTk3Q_rfa-awZufUtffZa+m1OYhds_gqoKGjv8vQ**At_Symbol_Here**mail.gmail.com>
Greetings,
I'll recommend taking the ordering number along with batch off of label back to vendor's web site.
See what they have in their documents where they analyzed the batch
they will list trace contamination and any mention of "preservatives" if that apples
Cheers
Dr T
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
-- Joel Thompson, PhD
Associate Professor of Chemistry
Community College of Denver
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