Date: Tue, 17 May 2011 22:00:29 -0400
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: ILPI <info**At_Symbol_Here**ILPI.COM>
Subject: Re: Piranha solution
In-Reply-To: <5B0B5ACDD36F9340940DAC5575821D870112D364**At_Symbol_Here**>

I've said it before on this list, so I will simply reference the previous discussion(s) and say here that Piranha solution is exceedingly dangerous and, in all but carefully controlled and highly limited circumstances, poses an unacceptable risk in synthetic research labs.  The near miss you describe and the apparently limited knowledge of those who were using it serves to reinforce my argument. ;L=DCHAS-L&D=0&T=0&P=48619 ;L=DCHAS-L&D=0&T=0&P=52225 t/chem/piranha_solution.html

Rob Toreki

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On May 17, 2011, at 4:20 PM, Johnson, Amy Carr wrote:

I have been reading about how to make Piranha solution and I keep coming across this statement,  =93Add the acid to the peroxide, although some authorities disagree=94   Why would authorities not agree that adding acid to water instead of water to acid is best?
I have seen some say add acid to peroxide for initial solution, but when refreshing, add aliquots of hydrogen peroxide to Piranha mixture.  Is that ok?
We recently had an incident when Piranha came in contact with ferric chloride and instantly reacted
violently Was this due to the metal, the fact that both are oxidizers, both, or something else?
I have read that neoprene gloves should always be worn.  True?
What type of glass is appropriate for containment?

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