Peroxyacids (RCO3H) are strong oxidizers; basically, they react by 'donatin g' oxygen atoms to reducing agents RCO3H + reducing agent --> RCO2H (a carboxylic acid) + Reducing agent + an O atom; further chemistry may occur with the oxidized reducing agent. Any decent reducing agent will work; one advantage of using Fe+2 ions, such as in ferrous ammonium sulfate, is that the Fe+2 will be oxidized to Fe+3; this should give a color change which can be used to confirm that the reac tion occurred. To answer the question, there may not be a 'preferred method'; there are do zens of reagents that should work. -----Original Message----- From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**LIST.UVM.EDU] On Behalf Of De bbie M. Decker Sent: Friday, March 12, 2010 5:57 PM To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU Subject: [DCHAS-L] FW: Inactivation of Meta chloro peroxybenzoic acid Hey all you chemists out there! I don't quite know where to begin to give my colleague, Dexter, advice. Ideas? -----Original Message----- From: Dexter Debbie We are using MCPBA to make some epoxides. I need to purify the MCPBA before I use it and the wash and crystalization process leaves a significant anoumt in solution. Usually dichloromethane. I will obviuosly discard this solution as toxic waste but I want to deactivate the MCPBA that remains. I have read you can use NaI , ferrous ions, potassium hydroxide, sodium thiosulfate, etc. What in your knowledge is the preferred method. Thanks. Dexter ----------------------------- Debbie M. Decker, Campus Chemical Safety Officer Environmental Health and Safety University of California, Davis 1 Shields Ave. Davis, CA=A0 95616 (530)754-7964/(530)752-4527 (FAX) dmdecker**At_Symbol_Here**ucdavis.edu Co-Conspirator to Make the World A Better Place -- Visit www.HeroicStories.com and join the conspiracy
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