Examples of superacids are fluoroantimonic acid, magic acid and perchloric acid.
From the en.wikipedia.org
Perchlorate, a type of salt derived from perchloric acid, has been found in drinking water in at least 35 states.
From the kentucky.com
It then can be titrated using a solution in glacial acetic acid of a very strong acid, such as perchloric acid.
From the en.wikipedia.org
It also coprecipitates with silicotungstic acid, and with perchloric acid, without another alkali metal as a carrier, which provides other methods of separation.