General Description
FERRIC AMMONIUM CITRATE(1185-57-5) is a yellowish brown to red solid with a faint odor of ammonia. FERRIC AMMONIUM CITRATE(1185-57-5) is soluble in water. The primary hazard is the threat to the environment. Immediate steps should be taken to limit its spread to the environment. FERRIC AMMONIUM CITRATE(1185-57-5) is used in medicine, in making blueprints, and as a feed additive.
Reactivity Profile
Acidic salts, such as FERRIC AMMONIUM CITRATE, are generally soluble in water. The resulting solutions contain moderate concentrations of hydrogen ions and have pH's of less than 7.0. They react as acids to neutralize bases. These neutralizations generate heat, but less or far less than is generated by neutralization of inorganic acids, inorganic oxoacids, and carboxylic acid. They usually do not react as either oxidizing agents or reducing agents but such behavior is not impossible. Many of these compounds catalyze organic reactions. Special Hazards of Combustion Products: Toxic oxides of nitrogen or ammonia gas may be formed in fires [USCG, 1999].
Air & Water Reactions
Water soluble.
Health Hazard
Inhalation of dust irritates nose and throat. Ingestion causes irritation of mouth and stomach. Dust irritates eyes and causes mild irritation of skin on prolonged contact.
Potential Exposure
Ferric ammonium citrate is used in
blueprinting, photography, medical treatment; and as an
animal food additive.
Fire Hazard
Special Hazards of Combustion Products: Toxic oxides of nitrogen or ammonia gas may be formed in fires.
First aid
If this chemical gets into the eyes, remove any
contact lenses at once and irrigate immediately for at least
15 minutes, occasionally lifting upper and lower lids. Seek
medical attention immediately. If this chemical contacts the
skin, remove contaminated clothing and wash immediately
with soap and water. Seek medical attention immediately.
If this chemical has been inhaled, remove from exposure,
begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if
heart action has stopped. Transfer promptly to a medical
facility. When this chemical has been swallowed, get medical attention. Give large quantities of water and induce
vomiting. Do not make an unconscious person vomit. The
symptoms of metal fume fever may be delayed for
412 hours following exposure: it may last less than
36 hours.
Shipping
UN3077 Environmentally hazardous substances,
solid, n.o.s., Hazard class: 9; Labels: 9-Miscellaneous hazardous material, Technical Name Required.
Incompatibilities
Compounds of the carboxyl group react
with all bases, both inorganic and organic (i.e., amines)
releasing substantial heat, water and a salt that may be
harmful. Incompatible with arsenic compounds (releases
hydrogen cyanide gas), diazo compounds, dithiocarbamates, isocyanates, mercaptans, nitrides, and sulfides
(releasing heat, toxic and possibly flammable gases), thiosulfates and dithionites (releasing hydrogen sulfate and oxides of sulfur).
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.
The molecular formula of ammonium iron (III) citrate is variable. It can be prepared by adding Fe(OH)3 to an aqueous solution of citric acid and ammonia . The brown form is approximately 9% NH3, 16.5 – 18.5 % Fe , and 65 % hydrated citric acid; the green form is approximately 7.5 % NH3 , 14.5 – 16 % Fe, and 75% hydrated citric acid. The green type is more readily reduced by light than the brown.
Other uses for ammonium ferric citrate include water purification and printing (cyano type). 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.
In medicine, ammonium ferric citrate is used as a contrast medium. It is also used as a hematinic.
Chemical Properties
brownish-yellow to brown powder
Chemical Properties
Ferric ammonium citrate (iron (III) ammonium citrate) is prepared by the reaction of ferric hydroxide with citric acid, followed by treatment with ammonium hydroxide, evaporating and drying. The resulting product occurs in two forms depending on the stoichi- ometry of the initial reactants. (1) Ferric ammonium citrate (iron (HI) ammonium citrate, CAS No. 1332-98-5) is a complex salt of undetermined structure composed of 16.5 to 18.5% iron, approximately 9% ammonia, and 65% citric acid and occurs as reddish brown or garnet red scales or granules or as a brownish-yellowish powder. (2) Ferric ammonium citrate (iron (HI) ammonium citrate, CAS No. 1333-00-2) is a complex salt of undetermined structure composed of 14.5 to 16% iron, approximately 7.5% ammonia and 75% citric acid and occurs as thin transparent green scales, as granules, as a powder, or as transparent green crystals. Supposedly, ferric ammonium citrate is one of the few soluble iron compounds which can be added to dairy products without inducing off-flavors.
Chemical Properties
Ferric ammonium citrate forms reddish brown
flakes or grains, or a brownish-yellow powder. It has a
slight ammonia odor. There is also a green form that is
odorless.
Flammability and Explosibility
Notclassified(100%)
storage
Color Code—Green: General storage may be used.Prior to working with this chemical you should be trainedon its proper handling and storage. Store in tightly closedcontainers in a cool, well-ventilated area away from light.Sources of ignition, such as smoking and open flames, areprohibited where ferric ammonium citrate is used, handled,or stored in a manner that could create a potential fire orexplosion hazard.
