Manganese(II) Sulfate Monohydrate
CAS No: 10034-96-5
Molecular Formula: MnSO₄·H₂O
Molecular Weight: 169.01 g/mol
1. Product Description
Manganese(II) sulfate monohydrate is a pale pink to white crystalline solid, highly soluble in water. It is widely used in fertilizers, animal feed, electroplating, ceramics, pigments, and as a nutritional supplement in food and pharmaceutical applications.
2. Specifications – Industrial Grade
| Item | Specification / Typical Value | Test Method / Notes |
|---|
| Appearance | White to light pink crystalline powder | Visual inspection |
| Assay (MnSO₄·H₂O, dry basis) | ≥ 98.5 % | Gravimetric |
| Manganese (Mn) | ≥ 32.0 % | ICP / AAS |
| Moisture | ≤ 0.5 % | Oven-dry method |
| Water-Insoluble Matter | ≤ 0.1 % | Filtration residue |
| Iron (Fe) | ≤ 0.005 % | ICP |
| Lead (Pb) | ≤ 30 ppm | ICP |
| Arsenic (As) | ≤ 5 ppm | ICP |
| Cadmium (Cd) | ≤ 10 ppm | ICP |
| Mercury (Hg) | ≤ 1 ppm | ICP |
| pH (10 % solution) | 4.0 – 6.5 | 20 – 25 °C |
| Bulk Density | ~1.20 – 1.40 g/cm³ | Typical value |
| Solubility | Freely soluble in water, 10 % solution clear | Visual |
Typical Applications:
Fertilizers (Mn micronutrient source), animal feed additive (non-food grade), electroplating, pigments, chemical synthesis, mining industry, and metallurgy.
3. Specifications – Food Grade (FCC / USP / EP)
| Item | Specification / Typical Value | Reference |
|---|
| Appearance | White to pale pink crystals, free from visible impurities | FCC / USP |
| Identification | Passes FCC / USP / EP tests (sulfate and Mn reaction) | FCC / USP |
| Assay (MnSO₄·H₂O) | 98.0 – 102.0 % (on dry basis) | FCC / USP |
| Loss on Ignition (LOI) | 10.0 – 13.0 % | FCC |
| Manganese (Mn) | Consistent with assay (≈ 32–33 %) | ICP |
| Arsenic (As) | ≤ 3 ppm | FCC |
| Lead (Pb) | ≤ 4 ppm | FCC |
| Cadmium (Cd) | ≤ 0.1 ppm | FCC |
| Mercury (Hg) | ≤ 1 ppm | FCC |
| Iron (Fe) | ≤ 10 ppm | USP |
| Chloride (Cl⁻) | ≤ 100 ppm | USP |
| Heavy Metals (as Pb) | ≤ 20 ppm | USP |
| Microbiological Limits | Total plate count ≤ 10³ cfu/g; Yeast & Mold ≤ 10² cfu/g; Coliforms negative | Food grade requirement |
| pH (10 % solution) | 4.0 – 6.0 | 20 – 25 °C |
| Solubility | Freely soluble in water; solution clear | FCC |
Typical Applications:
Food fortification (trace mineral source), dietary supplements, pharmaceuticals, beverage fortification, infant formula (where permitted).
4. Physical & Chemical Properties
Density: ~2.95 g/cm³ (monohydrate)
Solubility: Highly soluble in water, solubility increases with temperature
Appearance: Pink to white crystals or powder
Stability: Hygroscopic; decomposes on strong heating (loses water, forms anhydrous salt)
5. Storage & Handling
Store in a cool, dry, and well-ventilated place.
Keep container tightly closed to prevent moisture absorption (hygroscopic).
Avoid contact with strong oxidizing agents or reducing agents.
Handle in accordance with good industrial hygiene practices; use dust protection if necessary.
6. Packaging
Industrial Grade: 25 kg or 50 kg woven or kraft paper bags, big bags available.
Food Grade: Food-safe polyethylene or laminated bags, typically 1 kg, 5 kg, 25 kg packages with moisture barrier.
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