Potassium pyrosulfate, or potassium disulfate, is an inorganic compound with the chemical formula K2S2O7.
P 2475 (OTTO) Potassium pyrosulphate, 98% Cs 7790-62-7 - used in analytical chemistry; samples are fused with potassium pyrosulfate, (or a mixture of potassium pyrosulfate and potassium fluoride) to ensure complete dissolution prior to a quantitative analysis.