ALUMINIUM AMMONIUM SULFATE
Prepared at the 63rd JECFA (2004) and published in the Combined Compendium of Food Additive Specifications, FAO JECFA Monographs 1 (2005). A PTWI of 2 mg/kg bw for aluminium was established at the 74th JECFA (2011).
SYNONYMS Ammonium alum; INS No. 523
DEFINITION
Chemical names Aluminium ammonium sulfate
C.A.S. number 7784-25-0
Chemical formula AlNH4(SO4)2 · 12H2O
Formula weight 453.32
Assay Not less than 99.5% of AlNH4(SO4)2 · 12H2O
DESCRIPTION Large, colourless crystals, white granules, or a powder; odourless
FUNCTIONAL USES Buffer, neutralizing agent, colour fixative
