Pyrosulfate
（重定向自Pyrosulphate）
In chemistry, disulfate or pyrosulfate is the anion with the molecular formula S
2O2−
7. Disulfate is the IUPAC name.
It has a dichromate-like structure and can be visualised as two corner-sharing SO4 tetrahedra, with a bridging oxygen atom.
In this anion, sulfur has an oxidation state of +6. Disulfate is the conjugate base of the hydrogen disulfate (hydrogen pyrosulfate) ion HS
2O20−
7, which in turn is the conjugate base of disulfuric acid (pyrosulfuric acid).