Product name:Ammonium ferric citrate
CAS:1185-57-5
Molecular Formula:C12H22FeN3O14
Formula Weight:488.16
Density:1.8 g/cm3 (20ºC)
Boiling point:197ºC
Water solubility:1200 g/L (20 ºC)
Appearance:Pale yellow brown to red solid, with a faint ammonia odor
Synonym:Ammonium iron(III) citrate;Citric acid iron ammonium;Ferricammoniumcitrae
Storage conditions:Warehouse low temperature, ventilation, drying
Description:Ammonium ferric citrate is a food additive with E number E381 used as an acidity regulator. It is a green or reddish-brown powder which is very soluble in water.
Other uses for ammonium ferric citrate include water purification and printing (cyanotype). It is used as a reducing agent of metal salts of low activity like gold and silver and is also in a commonly used recipe with potassium ferricyanide to make cyanotype prints. Ammonium ferric citrate is also used in Kligler iron deeps to determine hydrogen sulfide production in microbial metabolism.
Ammonium ferric citrate is present in Scottish carbonated soft drink Irn-Bru.In medicine, ammonium ferric citrate is used as a contrast medium.