Ammonium iron (III) citrate

Structural formula
General
Surname	Ammonium iron (III) citrate
other names	Ammonium iron citrate Ammonium ferric 2-hydroxy-1,2,3-propane tricarboxylate Ferriammonium citrate
Molecular formula	C 6 H 8 O 7 • nFe • nH 3 N
Brief description	dark brown, almost odorless solid
External identifiers / databases
CAS number 1185-57-5 EC number 214-686-6 ECHA InfoCard 100.013.351 PubChem 3080636 ChemSpider 2338386 Wikidata Q473522
properties
Molar mass	261.974 g mol −1
Physical state	firmly
solubility	very good in water (1200 g l −1 at 20 ° C)
safety instructions
GHS labeling of hazardous substances no GHS pictograms H and P phrases H: no H-phrases P: no P-phrases
Toxicological data	2000 mg kg −1 ( LD 50 ,  rat ,  oral )
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Ammonium iron (III) citrate , also known as ammonium iron citrate , iron ammonium citrate, ferric ammonium citrate or citric acid iron , forms non-stoichiometric , depending on the iron content, green (14.5 - 16% Fe) to brown (16.5 - 28% Fe) crystals that are easily soluble in water smell slightly of ammonia . The crystals, which are sparingly soluble in ethanol, dissolve in air and decompose when exposed to (sunlight) light.

use

It is mainly used for photosensitization. Substances impregnated with solutions of ammonium iron citrate, tartaric acid and silver nitrate can be used as photo positive with shades of brown.

Ammonium iron (III) citrate is used both in cyanotype and in medicine, here for the treatment of iron deficiency anemia .

Manufacturing

Ammonium iron (III) citrate can be prepared by neutralization of citric acid with iron (III) hydroxide and ammonia are produced.

Individual evidence

1. ↑ ^{a b c d} data sheet ammonium iron (III) citrate (PDF) from Merck , accessed on January 19, 2011.
2. ↑ Entry on ammonium iron (III) citrate in the ChemIDplus database of the United States National Library of Medicine (NLM)
3. ^ ^{A b c} Franz von Bruchhausen, Siegfried Ebel, Eberhard Hackenthal: Hager's handbook of pharmaceutical practice: substances AK . Springer DE, 1999, ISBN 978-3-642-58387-2 , pp. 73 ( limited preview in Google Book search).
4. ^ Society for photographic high-quality printing processes: Cyanotype , accessed on May 22, 2013.