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not_important
International Hazard
Posts: 3873
Registered: 21-7-2006
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Piranha Solution:
http://web.princeton.edu/sites/ehs/labsafetymanual/cheminfo/...
http://web.mit.edu/cortiz/www/PiranhaSafety.doc
http://www.enma.umd.edu/LAMP/Sop/Piranha_SOP.htm
http://smfl.microe.rit.edu/piranha
http://ehs.uky.edu/ohs/piranha.html
Generally you don't keep piranha around once used, especially if you've mixed the acid and peroxide to some ratio, then started the cleaning. If you
start with the H2SO4 and warm it up, then dribble in H2O2 giving it plenty of time to react and not build up an excess, you can let the used acid sit
for awhile, as often the reaction continues for a period of time, then slowly heat it up to 150 C or so, leaving it as mostly H2SO4 with any inorganic
salts formed in the cleaning. If the acid isn't strongly discoloured, you can store it for reuse. I would not store premixed piranha for any length
of time.
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stoichiometric_steve
National Hazard
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Registered: 14-12-2005
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| Quote: | Originally posted by not_important
I would not store premixed piranha for any length of time. |
i left some pretty dilute piranha in an emaille pot for about a week. when i came back, the pot had a tiny hole where the acid crept on the work
bench, ruining the plastic coated wood surface.
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Magpie
lab constructor
Posts: 5939
Registered: 1-11-2003
Location: USA
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Mood: Chemistry: the subtle science.
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I can vouch for that. I recently bought an Allihn condenser off eBay with a bad rust deposit in the cooling jacket. As recomended on this forum I
filled the jacket with aqueous oxalic acid solution (5wt%), and within an hour the rust color had completely disappeared!
I normally woudn't buy glassware that looked that bad but it had the rare 40/50 taper fitting.
The single most important condition for a successful synthesis is good mixing - Nicodem
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Sedit
International Hazard
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Registered: 23-11-2008
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Hey maybe Im to much of a free thinker and all but..... Have you tryed to use common rust remover to get ride of it? Its sodium bisulfite and a couple
other things which I cant remember but its made for removing Fe contamination from stuff so it seems like its pretty much what your looking for. Try
the laundry isle.
Knowledge is useless to useless people...
"I see a lot of patterns in our behavior as a nation that parallel a lot of other historical processes. The fall of Rome, the fall of Germany — the
fall of the ruling country, the people who think they can do whatever they want without anybody else's consent. I've seen this story
before."~Maynard James Keenan
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Magpie
lab constructor
Posts: 5939
Registered: 1-11-2003
Location: USA
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Mood: Chemistry: the subtle science.
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Buy rust remover, buy oxalic acid. I already had the oxalic acid on hand. Where I live rust from tap water does not occur. So I'm done now.
The single most important condition for a successful synthesis is good mixing - Nicodem
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