Polonium tetranitrate is an inorganic compound, a salt of polonium and nitric acid with the chemical formula Po(NO<sub>3</sub>)<sub>4</sub>. The compound is radioactive, forms white crystals.
Dissolution of metallic polonium in concentrated nitric acid:
Polonium(IV) nitrate forms white or colorless crystals. It dissolves in water with hydrolysis.
It disproportionates in aqueous weakly acidic nitric acid solutions:
The polonium(II) ion (Po<sup>2+</sup>) is then oxidized by nitric acid to polonium(IV).