Cobalt Sulfate

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Cobalt Sulfate

IUPAC name: cobalt sulfate
CAS number: 10124-43-3
Molecular formula: CoSO4
Molar mass: 154.996 g/mol (anhydrous), 173.01 g/mol (monohydrate), 263.08 g/mol (hexahydrate), 281.103 g/mol (heptahydrate)
Appearance: reddish crystalline (anhydrous, monohydrate), pink salt (heptahydrate)
Density: 3.71 g/cm3 (anhydrous), 3.075 g/cm3 (monohydrate), 2.019 g/cm3 (hexahydrate), 1.948 g/cm3 (heptahydrate)
Solubility: soluble in water, insoluble in ammonia
Co: 21% min
Insoluble matter: 0.02% max
As: 0.0005% max
Pb: 0.002% max

As an inorganic salt of divalent cobalt, cobalt sulfate is widely used in many fields, like in the electroplating and electrochemical industries and as a coloring and drying agent. The most form of cobalt sulfate is cobalt sulfate heptahydrate.

As feed additive, cobalt sulfate is used in animal feeds as a mineral supplement and used on pastures where the forage is cobalt deficient, to provide enough cobalt for ruminants to produce vitamin B12. In the electroplating and electrochemical industries, it is used as a drier for lithographic inks, varnishes, paints, and linoleum; in storage batteries; and as a coloring agent in ceramics, enamels, glazes, and porcelain. It is used in veterinary medication to prevent and treat cobalt deficiency in ruminants, and use in humans to improve hematocrit, hemoglobin, and erythrocyte levels. In addition, it could be applied as catalyst, analysis reagent, tyre adhesive, etc.

Cobalt is considered an essential element for animals, including humans, because it is incorporated into the vitamin B12 molecule. Green plants do not synthesize vitamin B12; microorganisms in ruminants (cud-chewing mammals with multi-chambered stomachs, such as cattle and sheep) are the only major producers of vitamin B12 in the food chain. Vitamin B12 contains about 4% cobalt by weight. Ruminants require 0.07 to 0.10 ppm cobalt in their feed, and lack of cobalt in the soil and feedstuffs prevents them from synthesizing enough B12 for their needs. To prevent cobalt deficiency in cattle and sheep, cobalt sulfate may be added to feedstuffs, or cobalt may be added to the soil to increase its levels in plants.

Related Names
Cobaltous Sulfate | Rose Vitriol | CoSO4 | Feed Additive

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