Ammonium perrhenate (APR) is the ammonium salt of perrhenic acid, NH4ReO4. This is the most common form in which rhenium is 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
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