POTASSIUM METABISULFITE
Prepared at the 53rd JECFA (1999) and published in FNP 52 Add 7 (1999), superseding tentative specifications prepared at the 51st JECFA (1998),
published in FNP 52 Add 6 (1998). Group ADI 0-0.7 mg/kg bw as SO2 for sulfite established at the 51st JECFA in 1998.
SYNONYMS INS No. 224
DEFINITION
Chemical names Potassium disulfite, potassium pentaoxodisulfate, potassium pyrosulfite
C.A.S. number 16731-55-8
Chemical formula K2S2O5
Formula weight 222.33
Assay Not less than 90%
DESCRIPTION Colourless free-flowing crystals, crystalline powder, or granules, usually
having an odour of sulfur dioxide
FUNCTIONAL USES Antibrowning agent, antioxidant, preservative
