Ammonium perrhenate(APR) is the ammoniumsalt of perrhenic acid, NH4ReO4. This is the most common form in which rheniumis traded. It is a white, water-soluble salt. It was first described soon after the discovery of rhenium.
Ammonium perrhenate may be prepared from virtually all common sources of rhenium. The metal, oxides, and sulfides can be oxidized with nitric acid and the resulting solution treated with aqueous ammonia. Alternatively an aqueous solution of Re2O7 can be treated with ammonia followed by crystallisation.
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