TETRASODIUM PYROPHOSPHATE
Prepared at the 41st JECFA (1993), published in FNP 52 Add 2 (1993) superseding specifications prepared at the 37th JECFA (1990), published in
FNP 52 (1992). Metals and arsenic specifications revised at the 55th JECFA (2000). A group MTDI of 70 mg/kg bw, as phosphorus from all food
sources, was established at the 26th JECFA (1982)
SYNONYMS Tetrasodium diphosphate, sodium pyrophosphate; INS No 450 (iii)
DEFINITION
Chemical names Tetrasodium diphosphate, tetrasodium pyrophosphate
C.A.S. number 7722-88-5
Chemical formula Anhydrous: Na4P2O7
Decahydrate: Na4P2O7 · 10H2O
Formula weight Anhydrous: 265.94
Decahydrate: 446.09
Assay Not less than 95.0% on the ignited basis
DESCRIPTION Colourless or white crystals, or a white crystalline or granular powder; the decahydrate effloresces slightly in dry air
FUNCTIONAL USES Emulsifier, buffering agent, emulsifying agent, sequestrant
