EDTA-MnNa₂, Disodium Manganese EDTA

1. Product Profile

Chemical Name: Disodium Manganese Ethylenediaminetetraacetate

Abbreviation: EDTA-MnNa₂ / Mn-EDTA

CAS No.: 15375-84-5

EC No.: 239-407-5

Molecular Formula: C₁₀H₁₂N₂O₈MnNa₂·2H₂O*

Molecular Weight: 425.16 g/mol*

*Hydration state may vary depending on product specification.

Appearance: Light pink crystalline powder

Solubility: Readily soluble in water

Purity: >99%

Manganese (Mn): 12.5-13.5%

Water-Insoluble Matter: <0.1%

pH (10 g/L, 25°C): 6.0-7.0

Typical Elemental Composition: C 28.25% | H 3.79% | N 6.59% | O 37.63% | Mn 12.92% | Na 10.82%

Storage: Keep tightly sealed in a cool, dry place away from direct sunlight and moisture.

2. Role of Manganese in Plant Nutrition

Manganese is an essential micronutrient involved in several key physiological processes, including:

• Photosynthesis and chlorophyll formation

• Photosystem II and water-splitting reactions

• Enzyme activation

• Nitrogen metabolism and nitrate reduction

• Protein and carbohydrate metabolism

• Antioxidant defense

Manganese deficiency commonly appears as interveinal chlorosis, reduced growth, shortened internodes, poor root development and impaired crop quality.

3. How EDTA-Mn Works

EDTA forms a stable chelate around Mn²⁺, helping keep manganese soluble and available to plants.

Reduced Soil Fixation

In alkaline, calcareous or high-phosphate soils, free manganese can rapidly form poorly soluble compounds. EDTA complexation helps protect Mn²⁺ from precipitation and fixation.

Flexible Uptake

EDTA-Mn can be applied through:

• Foliar spraying

• Fertigation

• Drip irrigation

• Soil application

Foliar application is particularly useful when rapid correction of manganese deficiency is required.

Efficient Physiological Delivery

Once absorbed, manganese participates in photosynthesis, enzyme activation, nitrogen metabolism and cellular antioxidant systems.

4. Typical Production Process

Main Raw Materials

• Disodium EDTA

• Manganese sulfate

• Sodium hydroxide

• Deionized water

Typical Process

1. Dissolve disodium EDTA in warm water at approximately 50–60°C.

2. Prepare and filter the manganese sulfate solution separately.

3. Slowly combine the manganese solution with the EDTA solution.

4. Adjust pH to approximately 6.5–7.5.

5. Maintain controlled temperature and agitation until chelation is complete.

6. Filter, concentrate and spray-dry to obtain powder, or formulate directly into a liquid product.

Key process controls include pH, temperature and calcium/magnesium impurity levels, as competing metal ions may affect chelation efficiency.

5. Main Applications

Agriculture

The primary application of EDTA-MnNa₂ is as a high-efficiency chelated manganese source in:

• Water-soluble fertilizers

• Micronutrient blends

• Foliar fertilizers

• Liquid fertilizers

• Fertigation formulations

• Specialty NPK fertilizers

It is particularly suitable for high-value crops, vegetables, fruit trees, legumes and crops grown under conditions where manganese availability is limited.

Industrial Applications

EDTA-Mn may also be used as a specialty manganese complex in selected chemical, analytical and industrial formulations, subject to the required product grade and applicable regulations.

6. Advantages over Inorganic Manganese Sources

Compared with conventional manganese sulfate or manganese chloride, EDTA-MnNa₂ offers several formulation and application advantages:

Improved Manganese Availability

Chelation helps reduce precipitation and fixation, particularly under alkaline, calcareous or phosphate-rich conditions.

High Water Solubility

Suitable for fully water-soluble fertilizer and liquid fertilizer systems.

Flexible Application

Compatible with foliar spraying, fertigation, drip irrigation and soil application.

Better Formulation Stability

EDTA protects Mn²⁺ from undesirable reactions with other ions, improving stability in many multi-nutrient formulations.

Efficient Micronutrient Delivery

Provides manganese in a readily available chelated form suitable for precision crop nutrition.

7. Summary

EDTA-MnNa₂ is a highly soluble and stable chelated manganese source designed for modern fertilizer formulations and precision crop nutrition.

By protecting Mn²⁺ from precipitation and soil fixation, it improves manganese availability and offers greater formulation flexibility than conventional inorganic manganese salts.

It is particularly suitable for water-soluble fertilizers, foliar nutrients, fertigation systems, micronutrient blends and specialty NPK formulations, making it a practical manganese source for high-value and intensive cropping systems.

EDTA-MnNa₂, Disodium Manganese EDTA