Solution

First, check that there is no reaction taking place producing heat or evolving gasses. So long as the spill is contained it should be possible to deal with it safely – but be aware there are some combinations of acids that can be very dangerous. Both nitric and acetic acid react violently with concentrated mineral acids, possibly creating a much more dangerous solution. With this in mind the spill should be neutralised and adsorbed as quickly as possible. Metal acid cabinets have a very limited lifespan as the corrosive atmosphere eats away at them, regular checks or replacement with plastic ones is advisable.

Charles Harrison is a safety adviser at a UK university

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