Sodium ferrocyanide

Source: Wikipedia, the free encyclopedia.
Sodium ferrocyanide[1]
Names
IUPAC name
Tetrasodium [hexacyanoferrate(II)]
Other names
  • Yellow prussiate of soda (YPS)
  • Tetrasodium hexacyanoferrate
  • Gelbnatron
  • Ferrocyannatrium
  • sodium hexacyanoferrate(II)
  • Yellow blood salt[citation needed]
Identifiers
3D model (
JSmol
)
ECHA InfoCard
 100.033.696 Edit this at Wikidata
EC Number
  • 237-081-9
E number E535 (acidity regulators, ...)
UNII
  • InChI=1S/6CN.Fe.4Na/c6*1-2;;;;;/q6*-1;+2;4*+1
  • [Na+].[Na+].N#C[Fe-4](C#N)(C#N)(C#N)(C#N)C#N.[Na+].[Na+]
Properties
Na4[Fe(CN)6]
Molar mass 303.91 g/mol
Appearance pale yellow crystals
Odor odorless
Density 1.458 g/cm3
Melting point 435 °C (815 °F; 708 K) (anhydrous)
81.5 °C (178.7 °F; 354.6 K) (decahydrate) (decomposes)
10.2 g/100 mL (10 °C)
17.6 g/100 mL (20 °C)
39.7 g/100 mL (96.6 °C)
1.530
Structure
monoclinic
Related compounds
Other anions
 Sodium ferricyanide (Red prussiate of soda)
Other cations
 Potassium ferrocyanide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Sodium ferrocyanide is the sodium

anion. Despite the presence of the cyanide ligands, sodium ferrocyanide has low toxicity (acceptable daily intake 0–0.025 mg/kg body weight[2]). The ferrocyanides are less toxic than many salts of cyanide, because they tend not to release free cyanide.[3] However, like all ferrocyanide salt solutions, addition of an acid or exposure to UV light can result in the production of hydrogen cyanide gas, which is extremely toxic. [4][5]

Uses

When combined with an Fe(III) salt, it converts to a deep blue pigment called

mercaptans
.

In the EU, ferrocyanides (E 535–538) were, as of 2018, solely authorized as additives in

anticaking agents. The kidneys are the organ susceptible to ferrocyanide toxicity, but according to the EFSA, ferrocyanides are of no safety concern at the levels at which they are used.[7]

Production

Sodium ferrocyanide is produced industrially from

ferrous chloride, and calcium hydroxide, the combination of which affords Ca2[Fe(CN)6] · 11 H2O. A solution of this salt is then treated with sodium salts to precipitate the mixed calcium-sodium salt CaNa2[Fe(CN)6]2, which in turn is treated with sodium carbonate to give the tetrasodium salt.[8]

References

  1. ^ Sodium ferrocyanide MSDS Archived 2010-05-17 at the Wayback Machine
  2. ^ "Toxicological evaluation of some food additives including anticaking agents, antimicrobials, antioxidants, emulsifiers and thickening agents". inchem.org. World Health Organization. 1974. Archived from the original on 1 December 2010. Retrieved 18 May 2009.
  3. ISBN 0-12-352651-5
    .
  4. ^ "PubChem Compound Summary for CID 26129, Sodium ferrocyanide". National Center for Biotechnology Information. PubChem. Archived from the original on 2023-02-13. Retrieved 2023-01-17.
  5. ^ "PubChem Compound Summary for CID 768, Hydrogen Cyanide". National Center for Biotechnology Information. PubChem. Archived from the original on 2023-03-03. Retrieved 2023-01-17.
  6. ^ "Prussian blue". Encyclopædia Britannica. Archived from the original on 5 September 2015. Retrieved 18 May 2009.
  7. PMID 32626000.{{cite journal}}: CS1 maint: multiple names: authors list (link
    )
  8. ISBN 978-3527306732
    .
Retrieved from "https://en.wikipedia.org/w/index.php?title=Sodium_ferrocyanide&oldid=1214527366"