From: George C. Walton <g.c.walton**At_Symbol_Here**REACTIVES.COM>
Subject: Re: [DCHAS-L] Perchloric acid-organic mixtures
Date: Thu, 5 Jun 2014 12:46:22 -0400
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: 000001cf80dd$aed11720$0c734560$**At_Symbol_Here**

You may find Schumacher, J.C., 1960, Perchlorates: Their Properties, Manufacture and Uses helpful.   We purchased a copy years ago from University Microfilms International. Chapters 11 and 12 may be useful.


George C. Walton, CHMM

Reactives Management Corporation

1025 Executive Blvd., Suite 101

Chesapeake, VA  23320

(757) 436-1033


From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of Dan Kuespert
Sent: Thursday, June 5, 2014 10:21 AM
Subject: [DCHAS-L] Perchloric acid-organic mixtures


I was wondering if anyone knows of any actual data about the stability of various perchloric acid-organic solvent mixtures. The mixtures in question are relatively (<10-15%) dilute solutions of perchloric in ethanol, ethylene glycol, butyl Cellosolve, etc. used for electropolishing. I’m having trouble finding literature reports. Of course, there’s plenty of reports (Bretherick’s, about hazards, but no actual information on how much is too much.


Normally, I would recoil from such mixtures, but perchloric-organic mixtures are pretty extensively used in the metallurgy literature. Just because something has been successfully used without incident, though, does not mean that it was used “safely.” It may mean that the lab was lucky.


I’ve had some problems in the past with other witch’s brews used for electropolishing, after which I determined that the literature-reported composition was beyond the actual stability limit for the particular (ethanol-nitric acid) system, so that’s kind of sensitized me to this application.






Dr. Daniel R. Kuespert

Homewood Laboratory Safety Advocate

Krieger School of Arts & Sciences/Whiting School of Engineering

The Johns Hopkins University

103G Shaffer Hall

3400 North Charles St.

Baltimore, MD 21218

(410) 516-5525


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