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14402-88-1
C10H12N2O8MgNa2•2H2O
394.55
Product Description
EDTA-MgNa2·2H2O is the dihydrate form of magnesium disodium ethylenediaminetetraacetate, commonly called EDTA magnesium, EDTA-Mg, magnesium disodium EDTA or chelated magnesium EDTA.
In this coordination compound, one magnesium ion is held within an EDTA ligand, while two sodium ions balance the charge. The product is generally supplied as a white crystalline powder that dissolves in water and is primarily used as a source of chelated magnesium in water-soluble fertilizers, foliar formulations, fertigation systems and selected technical formulations.
Magnesium is classified as a secondary plant nutrient rather than a micronutrient. It is the central atom in the chlorophyll molecule and also participates in enzyme activation and normal plant metabolism.
Commercial products described as EDTA-MgNa2 may not all have exactly the same hydration state. Buyers should therefore confirm the molecular formula, moisture content, magnesium reporting basis and current batch Certificate of Analysis before comparing quotations.
Item | Description |
|---|---|
Product name | Magnesium Disodium EDTA Dihydrate |
Common abbreviation | EDTA-MgNa2·2H2O |
Alternative names | EDTA magnesium, magnesium EDTA, magnesium disodium EDTA, EDTA-Mg |
Common commercial CAS number | 14402-88-1 |
Alternative hydrate CAS used by some catalogues | 194491-32-2 |
Dihydrate formula | C10H12MgN2Na2O8·2H2O |
Theoretical molecular weight of dihydrate | Approximately 394.53 g/mol |
Anhydrous coordination-salt molecular weight | Approximately 358.50 g/mol |
Appearance | White crystalline powder |
Typical commercial magnesium level | Approximately 5.5–6.5%, subject to grade and reporting basis |
Typical pH | Approximately 6.0–7.5 for a 1% aqueous solution |
Solubility | Water-soluble; verify the required concentration and clarity |
Main commercial use | Chelated magnesium source for fertilizer and technical formulations |
The CAS number and hydration description shown on an SDS may vary between suppliers. Purchase specifications and shipping documents should use one internally consistent identity.
The difference between an anhydrous calculation and a dihydrate calculation directly affects the reported molecular weight and theoretical magnesium percentage.
The anhydrous coordination salt has a molecular weight of approximately 358.50 g/mol and contains about 6.78% theoretical magnesium on an anhydrous basis. The ideal dihydrate has a molecular weight of approximately 394.53 g/mol and contains about 6.16% theoretical magnesium as supplied.
Consequently, two results that appear different may describe the same material on different bases:
“Mg on a dry basis” excludes the measured water content.
“Mg as supplied” includes water present in the commercial product.
“Chelated Mg” should indicate magnesium demonstrated to be associated with the declared chelating agent.
“Total Mg” may include both chelated and non-chelated magnesium.
For meaningful supplier comparisons, ask every supplier to state the hydration form, test method and reporting basis.
The following values are typical procurement references rather than a universal AOZUN specification. Final limits must be confirmed in the applicable TDS and batch COA.
Parameter | Typical procurement reference | Why it matters |
Appearance | White crystalline powder | Basic identity and contamination check |
Chelated magnesium | 5.5–6.5% | Confirms the delivered magnesium level |
pH, 1% aqueous solution | 6.0–7.5 | Affects formulation and application compatibility |
Water-insoluble matter | ≤0.10% | Important for clear liquids, filters and spray nozzles |
Water solubility | Clear or nearly clear solution at the agreed test concentration | “Water-soluble” alone does not define usable concentration |
Moisture or loss on drying | Grade-specific | Required to interpret assay and magnesium results |
Chelated fraction | Agreed specification and validated method | Distinguishes a true chelate from a simple physical blend |
Sodium content | Report when formulation sodium loading matters | Relevant in recirculating and salt-sensitive systems |
Particle size | Buyer-specific | Influences dissolution and dust generation |
Trace elements or heavy metals | Market- and application-specific | Required for compliance and formulation control |
The agreed COA should clearly state whether each result is measured as supplied or calculated on a dry basis.
EDTA is a multidentate ligand that coordinates a magnesium ion through several donor atoms. This creates a soluble magnesium–EDTA complex and reduces the amount of uncomplexed magnesium immediately available to react with incompatible components. That controlled complexation is the practical reason formulators choose EDTA-Mg over an unchelated magnesium salt in selected systems.
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Chelation does not make magnesium completely unaffected by its environment. The behavior of EDTA-Mg depends on pH, dilution, temperature, ionic strength, other ligands and competing metal ions.
EDTA forms stronger complexes with several metals, including iron, copper and zinc, than it does with magnesium. A concentrated mixture containing unchelated higher-affinity metal ions may therefore cause metal exchange. This can change magnesium availability, solution color, clarity or the chelation status of other nutrients.
A laboratory compatibility test should be completed before commercial production.
Magnesium has several essential functions in plants:
It occupies the central position in the chlorophyll molecule.
It supports photosynthesis and energy transfer.
It contributes to the activation of multiple enzyme systems.
It participates in phosphate and carbohydrate metabolism.
It is mobile within the plant, so deficiency symptoms often appear first on older leaves.
Magnesium deficiency can produce interveinal chlorosis, in which the tissue between leaf veins becomes yellow while the veins remain greener. Similar symptoms can also result from root damage, pH imbalance, salinity or antagonism from other nutrients. Fertilizer recommendations should therefore be based on soil, water or tissue analysis rather than leaf color alone.
EDTA-Mg may be included in foliar fertilizers when a formulator needs a water-soluble, chelated magnesium source. Its low insoluble-matter level can help protect filters and spray nozzles when the finished formulation is correctly dissolved and filtered.
The final spray concentration must be established through crop-specific trials. Excessive concentration, unsuitable water quality, high temperature or application under intense sunlight may increase the risk of leaf injury.
The product can be incorporated into fertilizer programs delivered through drip irrigation or other fertigation systems. Before use, formulators should evaluate source-water hardness, alkalinity, pH and the presence of phosphate, carbonate, silicate or competing metal ions.
Do not assume that stability in a diluted irrigation solution guarantees stability in a concentrated stock tank.
EDTA-Mg may be used in hydroponic formulations where controlled magnesium delivery and water solubility are important. Magnesium, calcium, potassium and total salinity should be balanced together because excessive concentrations of one cation can affect the uptake of others.
In recirculating systems, sodium introduced by the disodium salt should also be considered in the long-term nutrient balance.
EDTA-Mg can be added to water-soluble NPK and specialty fertilizer blends. Uniform particle distribution, moisture protection and compatibility with the other components should be tested before scale-up.
The product should not be treated as a direct one-to-one replacement for magnesium sulfate or magnesium nitrate because the magnesium concentration and accompanying ions are different.
EDTA-Mg may be suitable for clear liquid or suspension fertilizer systems when the product dissolves at the required concentration and remains stable throughout the intended shelf life.
Accelerated stability testing should include:
Low- and high-temperature storage
Freeze–thaw exposure where relevant
Solution clarity and sediment
pH drift
Color change
Assay and chelated-magnesium retention
Packaging compatibility
Reagent or technical grades may be used in research, analytical or industrial formulations that specifically require a magnesium–EDTA complex. Suitability must be based on an application-specific specification.
Agricultural or industrial grade material must not be assumed to meet food, pharmaceutical, injectable or diagnostic requirements.
Factor | EDTA-MgNa2·2H2O | Magnesium Sulfate | Magnesium Nitrate |
Magnesium form | EDTA-chelated magnesium | Unchelated magnesium salt | Unchelated magnesium salt |
Typical Mg concentration | Around 6%, depending on grade | Higher than EDTA-Mg | Higher than EDTA-Mg |
Additional nutrient | No sulfur or nitrogen claim | Supplies sulfur | Supplies nitrate nitrogen |
Main advantage | Controlled chelated form for selected formulations | Economical bulk magnesium source | Highly soluble magnesium and nitrogen source |
Main limitation | Higher cost and lower Mg density | May not suit every concentrated mixture | Adds nitrate nitrogen and is more hygroscopic |
Best suited for | Specialty chelated formulations, foliar products and precise nutrient systems | General magnesium correction and sulfur supply | Formulations requiring both magnesium and nitrate nitrogen |
EDTA-Mg is not automatically the best magnesium source for every crop or formulation. Magnesium sulfate is often more economical for large magnesium corrections, while EDTA-Mg is selected when the chelated form provides a specific formulation or application advantage.
No. The products have different elemental magnesium percentages, molecular weights, counterions and formulation behavior.
Replacement must be calculated from the required amount of elemental magnesium:
Required product amount = Target elemental magnesium ÷ Product magnesium fraction
The calculation should use the guaranteed magnesium value from the current COA, not a theoretical value copied from a general database.
Replacing magnesium sulfate also removes sulfur from the formula. Replacing magnesium nitrate changes the nitrogen balance. The complete nutrient formulation must therefore be recalculated.
Very acidic or strongly alkaline conditions may change complex behavior and the stability of other formulation ingredients. Measure pH after all components have been added because individual raw-material pH values do not predict the final solution pH.
Unchelated iron, copper, zinc and other metal ions can compete with magnesium for EDTA. This risk is especially important in concentrated stock solutions.
Whenever possible, use separately validated chelated trace elements and avoid leaving excess free metal ions in the concentrate.
Phosphate and carbonate can form poorly soluble salts with free magnesium under unfavorable conditions. Chelation may reduce immediate interaction, but it does not eliminate risks created by dilution, pH changes or metal exchange.
Hardness, bicarbonate alkalinity, dissolved metals and salinity can change product performance. Deionized, reverse-osmosis or otherwise controlled water may be preferable for concentrated liquid formulations.
A product that dissolves rapidly at low concentration may dissolve more slowly in a cold or highly concentrated solution. Validate dissolution time, maximum practical concentration and low-temperature stability.
A practical starting sequence for laboratory evaluation is:
Charge the mixing vessel with approximately 50–70% of the required water.
Start moderate agitation and confirm the initial water temperature and pH.
Add EDTA-MgNa2·2H2O gradually rather than dumping the full quantity at once.
Mix until the solution is visually clear and no undissolved material remains.
Add other fully dissolved components one at a time.
Avoid direct contact between concentrated EDTA-Mg and concentrated incompatible salts.
Adjust the final pH only after the main ingredients are dissolved.
Add the remaining water and mix to uniformity.
Check appearance, pH, density and filtration behavior.
Complete a jar test and stability study before full-scale production.
This sequence is a formulation-development guide, not a universal manufacturing instruction. The actual process should be validated for the finished formula and equipment.
The product name, CAS number, formula and hydration description should agree across the quotation, TDS, SDS, COA, label and transport documents.
Ask whether the supplier reports total Mg, water-soluble Mg, chelated Mg or a combination of these values. Also confirm how the chelated fraction is measured.
A result calculated on a dry basis cannot be compared directly with a result reported as supplied. Moisture or loss-on-drying data must be reviewed with the magnesium assay.
Instead of requesting only “water-soluble,” specify:
Test concentration
Water temperature
Water quality
Mixing time
Acceptable clarity
Maximum insoluble residue
EDTA-MgNa2 introduces sodium into the formulation. This may matter in sodium-sensitive crops, saline water or recirculating hydroponic systems.
The sample should represent the proposed commercial grade. Evaluate dissolution, filtration, pH, compatibility and storage stability before approving a bulk shipment.
A qualified EDTA-MgNa2·2H2O supplier should be able to provide the documents applicable to the offered grade:
Technical Data Sheet
Safety Data Sheet
Batch Certificate of Analysis
Product specification
Country-of-origin statement when required
Packaging information
Shelf-life or retest guidance
Regulatory or compliance statements relevant to the destination market
Additional impurity or trace-metal testing when agreed
The buyer should verify that documents refer to the same grade and hydration form. A high-purity laboratory catalogue specification should not be substituted for an agricultural bulk-product specification without technical review.
Agricultural grade is intended for fertilizer manufacturing or plant-nutrition applications. Important controls generally include chelated magnesium, water solubility, pH, insoluble matter and relevant contaminants.
Technical grade may be suitable for industrial formulations in which application-specific performance is more important than reagent-level purity. The required test methods and impurity limits should be agreed before purchase.
Reagent-grade material normally has tighter identity and assay requirements and may be offered in smaller packaging. Reagent grade does not automatically mean pharmaceutical, food or injectable grade.
Do not use agricultural or technical EDTA-Mg in food, dietary supplements, pharmaceuticals, injections or medical products unless the exact grade is explicitly manufactured, tested and legally approved for that use.
Compliance depends on the product, intended use, dosage, destination market and current regulations.
A common export package is a 25 kg net bag with an inner moisture-resistant liner. Alternative package sizes may be available by agreement.
Store EDTA-MgNa2·2H2O:
In its original, tightly closed packaging
In a cool and dry warehouse
Away from rain, direct sunlight and excessive humidity
Away from incompatible chemicals
On clean pallets and off the floor
With damaged bags isolated to prevent contamination
Reseal partly used packages promptly because moisture pickup can cause caking and can change the as-supplied assay.
Shelf life should be taken from the applicable AOZUN TDS or quotation rather than assumed from general industry practice.
Before handling the product, read the current SDS supplied with the batch.
Recommended workplace controls generally include:
Suitable protective gloves
Safety glasses or chemical goggles
Local dust control or adequate ventilation
Good industrial hygiene
Avoiding inhalation of airborne dust
Washing exposed skin after handling
Preventing uncontrolled discharge to drains or surface water
Spilled dry material should be collected in a way that minimizes dust generation. Disposal must follow local requirements and the applicable SDS.
Fertilizer classification, permitted chelating agents, nutrient declarations, contaminant limits, labeling and registration requirements differ between markets.
For example, some jurisdictions treat magnesium as a secondary nutrient and require chelating agents or chelated fractions to be identified by approved analytical methods. The product name alone does not establish regulatory compliance.
Before importing or formulating EDTA-MgNa2·2H2O, confirm:
Intended application
Destination country
Product classification
Required nutrient declaration
Accepted chelating-agent terminology
Required test methods
Contaminant limits
Labeling language
Registration or notification obligations
AOZUN supports B2B buyers by aligning the commercial grade with the customer’s technical and logistical requirements.
Available support may include:
Specification review before quotation
Batch COA and SDS documentation
Representative sample evaluation
Export packaging options
Lot-size and shipment planning
Technical communication for dissolution and compatibility testing
Support for buyer-defined quality parameters
Final values, documents, package sizes and compliance requirements should be confirmed in the AOZUN quotation and sales specification.
For a faster and more accurate quotation, provide:
Product name: EDTA-MgNa2·2H2O
Intended application
Required magnesium specification
Whether results must be reported as supplied or on a dry basis
Required chelated fraction
pH and insoluble-matter limits
Required package size
Trial quantity and annual demand
Destination port or delivery address
Required documents
Applicable regulatory standard
Target delivery schedule
No. Disodium EDTA is an EDTA sodium salt without a pre-chelated magnesium ion. EDTA-MgNa2 contains magnesium coordinated by EDTA and is used when a magnesium–EDTA complex is specifically required.
The ideal dihydrate contains approximately 6.16% theoretical magnesium. Commercial specifications commonly fall around 5.5–6.5%, depending on hydration, purity and reporting basis. Always use the guaranteed COA value for formulation calculations.
Approximately 358.50 g/mol is the molecular weight of the anhydrous coordination salt. The ideal dihydrate is approximately 394.53 g/mol. Some databases list the anhydrous formula even when a commercial product contains water of hydration.
Commercial EDTA-Mg is generally described as water-soluble, but usable solubility depends on concentration, temperature, water quality and the other ingredients present. Specify a practical dissolution and clarity test in the purchase agreement.
Not automatically. Total magnesium and chelated magnesium are different quality parameters. The chelated fraction should be confirmed by an agreed analytical method.
Compatibility must be tested. Because EDTA forms stronger complexes with several competing metals than it does with magnesium, unchelated metals in concentrated formulations may cause ligand exchange.
It can supply magnesium in some formulas, but it is not a one-to-one substitute. The magnesium amount must be recalculated, and the loss of sulfur from magnesium sulfate must be considered.
It may be suitable when sodium loading, magnesium balance, pH, competing nutrients and stock-solution stability have been evaluated. A small compatibility and crop trial is recommended.
There is no universal rate. The correct amount depends on crop, growth stage, deficiency severity, application method, water quality and local regulations. Base the program on soil, water or tissue analysis and qualified agronomic advice.
No. Agricultural or technical material should not be used for food, pharmaceutical, injectable or medical applications unless the exact supplied grade is expressly qualified and legally approved for that use.
Contact AOZUN with your target specification, application, quantity, destination and documentation requirements.
For formulation projects, include your desired magnesium concentration, solution pH, other metal ions and approximate stock-solution concentration. This information helps determine whether the proposed grade should proceed to sample testing and commercial evaluation.
