INTRODUCTION
Ferric Ammonium Citrate (FAC) is a mixture of indefinite composition that contains ferric and ammonium cations and citrate(3−) anions.
It may be obtained as red crystals or a brownish yellow powder or as green crystals or powder. Distinguishing feature of this compound is that it is very soluble in water, in contrast to ferric citrate which is not very soluble.
| Synonyms | Ammonium ferric citrate Iron(III) ammonium citrate |
| CAS no. | 1185-57-5 |
| EINECS no. | 214-686-6 |
| Molecular formula | Variable (Complex Salt) |
| Molecular weight | Variable (Complex Salt) |
| Structure |  |
APPLICATIONS
FAC has a wide range of applications and therapeutic uses, including:
| As a food ingredient, it has an INS number 381, and is used as an acidity regulator. |
| As a nutritional supplement. |
| As a hematinic that tends to stimulate blood cell formation or to increase the hemoglobin in the blood. |
| Source of iron in treating iron-deficiency anemia. It is less constipating than inorg forms of iron. It is free from astringent & irritant properties. |
| As a reducing agent of metal salts of low activity like gold and silver. |
| In medical imaging, it is used as a contrast medium. |
| With potassium ferricyanide as part of the cyanotype photographic process. |
| Used in Kligler iron deeps to determine hydrogen sulfide production in microbial metabolism. |
| Inks & Digital Inks. |
| Water purification & Pool chemicals. |
| Finishing & Flux. |
SPECIFICATIONS – reference BP
| Test | Unit | Specification |
|---|---|---|
| Description | – | Thin, transparent, dark red scales or granules or brownish red powder, odorless; deliquescent in moist air and is affected by light |
| Solubility (at 20⁰C) | – | Soluble in 0.5% part of water. Almost insoluble in 95% ethanol |
| Identification | – | Should be positive for Iron, Ammonia and Citrates as per BP |
| Arsenic | ppm | Max 4 |
| Lead (Pb) | ppm | Max 30 |
| Zinc (Zn) | – | Sample should be less turbid than standard |
| Sulphate | % | NMT 0.3 |
| Assay (as Fe) as such basis | % w/w | 20.5 – 22.5 |
– Spray dried homogeneous powder & granules
STORAGE
Keep well closed, protected against light, dry and at room temperature.
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