Safety and Disposal
Piranha solution is very dangerous, being both strongly acidic and a strong oxidizer. Solution that is no longer being used should never be left unattended if hot. It should not be stored in a closed container. Piranha solution should not be disposed with organic solvents (e.g. in waste solvent carboys), as this will cause a violent reaction and a substantial explosion.
Piranha solution should be allowed to cool, and oxygen gas should be allowed to dissipate prior to disposal. When cleaning glassware, it is both prudent and practical to allow the piranha solution to react overnight. This allows the spent solution to degrade prior to disposal. While some institutions believe that used Piranha solution should be collected as hazardous waste, others believe that it can be poured down the drain with copious amounts of water.
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