SODIUM THIOSULFATE
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 sulfites established at the 51st JECFA in 1998.
SYNONYMS Sodium hyposulfite; INS No. 539
DEFINITION
Chemical names Sodium thiosulfate
C.A.S. number 7772-98-7
Chemical formula Na2S2O3 · 5H2O
Formula weight 248.17
Assay Not less than 99.0% on the dried basis
DESCRIPTION Colourless crystals or coarse crystalline powder; deliquesces in moist air and effloresces in dry air above 33o
FUNCTIONAL USES Antibrowning agent, antioxidant, sequestrant
