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Views: 0 Author: Site Editor Publish Time: 2026-08-05 Origin: Site
Manganese sulfate (chemical formula MnSO₄) is an inorganic compound that typically appears as a pale pink, odorless crystalline powder or granular solid. It is highly soluble in water, making it an ideal delivery form for manganese in both agricultural and industrial processes.
The most common commercial form is manganese sulfate monohydrate (MnSO₄·H₂O, CAS Number: 10034-96-5), which typically contains 31–32% manganese content. Other hydrate forms exist, but the monohydrate dominates the market due to its stability and cost-effectiveness.
Property | Value |
Chemical formula | MnSO₄ (anhydrous); MnSO₄·H₂O (monohydrate) |
Molecular weight | 151.00 g/mol (anhydrous); 169.02 g/mol (monohydrate) |
Appearance | Pale pink crystalline powder or granules |
Odor | Odorless |
Solubility in water | Highly soluble (~52 g/100 mL at 20°C for monohydrate) |
pH (5% solution) | 3.0–4.5 (mildly acidic) |
Manganese content | ~32% Mn (monohydrate); ~36% Mn (anhydrous) |
Melting point | 700°C (decomposes) |
Density | 2.95 g/cm³ (monohydrate) |
The high water solubility of manganese sulfate is its defining advantage over other manganese sources such as manganese oxide (MnO) or manganese carbonate (MnCO₃). This property makes it the form of choice for solution-based applications, foliar spraying, and processes requiring rapid manganese availability.
Agriculture is the largest end-use market for manganese sulfate by volume, accounting for roughly 40–50% of global consumption.
Role in Plant Nutrition
Manganese is an essential micronutrient for all crops. It plays a vital role in:
Photosynthesis
● : Manganese is a key component of the oxygen-evolving complex in Photosystem II, where water is split to generate electrons.
Enzyme activation
● : It activates over 35 enzymes involved in carbohydrate metabolism, nitrogen assimilation, and antioxidant defense.
Chlorophyll synthesis
● : Manganese deficiency leads to interveinal chlorosis (yellowing between leaf veins) and reduced photosynthetic capacity.
Crops Most Sensitive to Manganese Deficiency
Crop | Deficiency Symptoms | Typical Application Rate |
Soybeans | Interveinal chlorosis on young leaves | 0.5–2.0 kg Mn/ha (foliar) |
Wheat & Barley | Grey speck, pale green striping | 1.0–2.5 kg Mn/ha |
Corn (Maize) | Yellow to white striping between veins | 1.0–3.0 kg Mn/ha |
Potatoes | Black spot, reduced tuber quality | 0.5–1.5 kg Mn/ha (foliar) |
Cotton | Yellowing between veins, crinkled leaves | 0.5–1.0 kg Mn/ha |
Citrus & Fruit Trees | Mottled leaves, reduced fruit set | 0.3–1.0 kg Mn/ha (foliar) |
Application Methods
Soil broadcast
● : 6–11 kg Mn/ha incorporated into soil before planting. Best suited for acidic to neutral soils (pH < 6.5). In high-pH or calcareous soils, manganese rapidly oxidizes to unavailable forms, so soil application is less effective.
Banded application
● : 1.4–2.3 kg Mn/ha placed in bands near the seed row. More efficient than broadcast since less manganese contacts the soil.
Foliar spray
● : 0.5–2.0 kg Mn/ha dissolved in water and sprayed directly onto crop foliage. This is the most common and effective method for correcting deficiencies during the growing season, as it bypasses soil fixation issues. Manganese sulfate is the preferred form for foliar application due to its high solubility.
Seed treatment
● : Coating seeds with manganese sulfate solution before planting. Effective for early-season deficiency prevention in small grains.
Soil Conditions That Trigger Deficiency
Manganese deficiency is most common under the following soil conditions:
High soil pH (> 6.5)
● : Manganese availability decreases sharply as pH rises. Calcareous and over-limed soils are particularly prone.
High organic matter soils (muck, peat)
● : Organic matter can complex manganese into unavailable forms.
Sandy soils with low cation exchange capacity
● : These soils have limited manganese reserves and are easily depleted.
Cold, wet conditions
● : Reduced microbial activity and root growth limit manganese uptake in early spring.
Dry conditions
● : Surface soil drying reduces manganese availability to shallow-rooted crops.
Manganese is an essential trace mineral for all livestock and poultry species. Manganese sulfate monohydrate is widely used as a feed-grade supplement due to its high bioavailability compared to manganese oxide.
Functions in Animal Nutrition
Bone development
● : Manganese is required for the synthesis of chondroitin sulfate, a key component of cartilage and bone matrix. Deficiency causes perosis (slipped tendon) in poultry and leg abnormalities in swine.
Reproductive performance
● : Adequate manganese levels support normal estrus cycles, conception rates, and fetal development. Deficiency is linked to reduced fertility and increased embryonic mortality.
Growth rate
● : Manganese-dependent enzymes are essential for carbohydrate and lipid metabolism, directly influencing feed conversion efficiency and weight gain.
Eggshell quality in layers
● : Manganese contributes to eggshell formation; deficiency results in thin-shelled eggs and reduced egg production.
Immune function
● : Manganese is a cofactor for superoxide dismutase (Mn-SOD), an important antioxidant enzyme.
Typical Inclusion Rates in Feed
Species | Recommended Mn in Complete Feed (mg/kg) |
Broiler chickens | 60–120 |
Laying hens | 60–120 |
Swine (grower-finisher) | 20–40 |
Swine (breeding) | 40–60 |
Dairy cattle | 40–60 |
Beef cattle | 20–40 |
Aquaculture (fish/shrimp) | 15–30 |
Companion animals (dogs/cats) | 5–15 |
Feed-grade manganese sulfate typically has a purity of 98%+ with manganese content of 31.5–32.5%. It is available in powder and granular forms, with granular preferred for micro-ingredient premix blending to ensure uniform distribution.
The fastest-growing application for manganese sulfate is as a precursor material for lithium-ion battery cathodes. Battery-grade manganese sulfate monohydrate (HPMSM) is the critical manganese source for several mainstream and emerging cathode chemistries.
Key Cathode Chemistries Using Manganese
Cathode Type | Formula | Manganese Role | Key Applications |
NCM (Nickel Cobalt Manganese) | LiNiₓCoᵧMn₁₋ₓ₋ᵧO₂ | Stabilizes structure; reduces cost | EVs, power tools, grid storage |
LMO (Lithium Manganese Oxide) | LiMn₂O₄ | Primary active material | Power tools, e-bikes, hybrids |
LMFP (Lithium Manganese Iron Phosphate) | LiMnₓFe₁₋ₓPO₄ | Increases energy density vs. LFP | Entry-level EVs, energy storage |
Sodium-ion cathodes | NaₓMnO₂-type | Core active material | Grid storage, low-cost applications |
Beyond agriculture and batteries, manganese sulfate serves as a versatile industrial chemical across multiple manufacturing sectors.
Ceramics & Glass
In the ceramics industry, manganese sulfate is used as a coloring agent and glaze component. When fired, manganese compounds produce colors ranging from soft pink to deep purple and brown, depending on the firing atmosphere and glaze composition. Typical applications include:
● Decorative ceramic tiles and sanitary ware
● Art pottery and studio ceramics
● Glass tinting and decolorizing agents
Manganese sulfate is ground and blended into ceramic body formulations or glaze slurries before firing. The typical inclusion rate in glaze recipes ranges from 1–8% by weight.
Pigments & Colorants
Manganese sulfate serves as a starting material for the synthesis of manganese-based inorganic pigments, including:
Manganese violet
● (ammonium manganese(III) pyrophosphate): Used in cosmetics, artists' colors, and plastics
Manganese blue
● (barium manganate(VI) sulfate): A specialty blue pigment
Manganese brown/black spinels
● : Used for coloring concrete products and coatings
These pigments offer excellent lightfastness, chemical resistance, and thermal stability compared to organic alternatives.
Textile Industry
In textile processing, manganese sulfate functions as:
● A mordant in dyeing processes, helping fix dyes to fabric fibers
● A component in oxidation catalysts for dye synthesis
● An additive in textile auxiliaries and finishing agents
Manganese sulfate's role in textile dyeing is particularly significant for vat dyes and sulfur dyes on cotton and cellulosic fibers.
Metal Surface Treatment
Manganese sulfate is used in phosphating solutions for metal surface treatment, where it contributes to:
● Corrosion resistance coatings on steel and iron components
● Improved paint adhesion on automotive and appliance parts
● Wear resistance in moving parts (manganese phosphate coatings)
Other Industrial Uses
Ore flotation
● : Manganese sulfate acts as an activator and depressant in froth flotation processes for mineral beneficiation.
Catalyst manufacturing
● : Serves as a precursor for manganese-based oxidation catalysts used in chemical synthesis and emission control.
Dry cell batteries
● : As an electrolyte component in certain primary battery types (though declining with the shift to alkaline and lithium systems).
Construction chemicals
● : Additive in cement and concrete formulations for color and specific performance properties.
Manganese sulfate is an effective chemical for municipal and industrial water treatment applications:
Iron and manganese control
● : In drinking water treatment, manganese sulfate is used in controlled doses to oxidize and precipitate dissolved iron and manganese, improving water clarity and taste.
Industrial wastewater treatment
● : Serves as a coagulant aid and oxidation catalyst for removing organic contaminants, heavy metals, and color from industrial effluents.
Cooling water treatment
● : Used as a corrosion inhibitor component in closed-loop cooling systems.
The compound's effectiveness in water treatment stems from its ability to participate in oxidation-reduction reactions and form insoluble precipitates that can be removed by filtration.
