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Ferrous Sulfate
Pure
Ferrous Sulfate

Ferrous Sulfate: CAS Number: 7720-78-7 (anhydrous), 17375-41-6 (monohydrate), 7782-63-0 (heptahydrate), Molecular Formula: FeSO4 for Anhydrous, Molecular Weight: 151.91 for Anhydrous

Ferrous Sulfate FCC Food Grade
FeSO4·7H2O Formula weight 278.02
CAS: [7782-63-0]

DESCRIPTION
Ferrous Sulfate occurs as pale, blue-green crystals or granules that are efflorescent in dry air. In moist air, it oxidizes readily to form a brown-yellow, basic ferric sulfate. A 1:10 aqueous solution has a pH of about 3.7. One gram dissolves in 1.5 mL of water at 25° and in 0.5 mL of boiling water. It is insoluble in alcohol.
Function: Nutrient.

REQUIREMENTS
Identification: A sample gives positive tests for Ferrous Salts (Iron) and for Sulfate.
Assay: Not less than 99.5% and not more than 104.5% of FeSO4·7H2O.
Lead: Not more than 2 mg/kg.
Mercury: Not more than 1 mg/kg.


Ferrous Sulfate, Dried FCC Food Grade
FeSO4·xH2O Formula weight, anhydrous 151.91
CAS: [7720-78-7]

DESCRIPTION
Ferrous Sulfate, Dried, occurs as a gray-white to buff colored powder consisting primarily of FeSO4·H2O, with varying amounts of FeSO4·4H2O. It dissolves slowly in water, but is insoluble in alcohol.
Function: Nutrient.

REQUIREMENTS
Identification: A sample gives positive tests for Ferrous Salts (Iron) and for Sulfate.
Assay: Not less than 86.0% and not more than 89.0% of FeSO4.
Insoluble Substances: Not more than 0.05%.
Lead: Not more than 2 mg/kg.
Mercury: Not more than 1 mg/kg.


Ferrous Sulphate BP Grade Ph Eur
Dried Ferrous Sulphate
General Notices
FeSO4 -- 151.9 -- 13463-43-9

DEFINITION
Hydrated ferrous sulphate from which part of the water of hydration has been removed by drying.
Content: 86.0 per cent to 90.0 per cent.

CHARACTERS
Appearance: Greyish-white powder.
Solubility: Slowly but freely soluble in water, very soluble in boiling water, practically insoluble in ethanol (96 per cent).
It is oxidized in moist air, becoming brown.

IDENTIFICATION
A. It gives the reactions of sulphates.
B. It gives reaction (a) of iron.
C. It complies with the limits of the assay.

TESTS
Solution S: Dissolve 2.00 g in a 5 per cent V/V solution of lead-free nitric acid R and dilute to 100.0 ml with the same acid.
pH: 3.0 to 4.0.
Chlorides: Maximum 300 ppm.
Chromium: Maximum 1.00 × 102 ppm.
Copper:Maximum 50.0 ppm.
Ferric ions: Maximum 0.50 per cent.
Manganese: Maximum 0.10 per cent.
Nickel: Maximum 1.00 × 102 ppm.
Zinc: Maximum 1.00 × 102 ppm.


Ferrous Sulfate Heptahydrate ACS AR Analytical Reagent Grade
Iron (II) Sulfate Heptahydrate
FeSO4 . 7H2O
Formula weight 278.01
CAS Number 7782-63-0

NOTE: Due to inherent oxidation, ferric ion (Fe3+) content may increase on storage.

REQUIREMENTS
Assay ≥99.0% FeSO4 . 7H2O
MAXIMUM ALLOWABLE
Insoluble matter 0.01%
Chloride (Cl) 0.001%
Phosphate (PO4) 0.001%
Copper (Cu) 0.005%
Manganese (Mn) 0.05%
Zinc (Zn) 0.005%
Ferric ion (Fe3+) 0.1%
Substances not precipitated by ammonium hydroxide 0.05%

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