EDTA-Na structure


Ethylenediaminetetraacetic acid (EDTA acid);
EDTA-2Na disodium salt;
EDTA-4Na tetrasodium salt;
EDTA-3Na trisodium salt.

EDTA is a representative substance of chelating agents, sequestering agent, complexing agent.
Various metal salts of EDTA (e.g. EDTA-Na, sodium salts of EDTA) are often used in practical applications.

Technical data:

itemsEDTA AcidEDTA-2NaEDTA-4Na
CAS Number60-00-46381-92-613235-36-4
EC Number200-449-4613-386-6;
Molecular FormulaC10H16N2O8C10H14N2O8Na2-2H2OC10H12N2O8Na4-4H2O
Molecular weightM=292.2M=372.24M=452.23
Content [%]≥99.0≥99.0≥99.0
Chloride (as Cl) [%]≤ 0.05≤ 0.01≤ 0.05
Sulfate (as SO4)[%]≤ 0.05≤ 0.05≤ 0.05
Heavy metal(by Pb) [%] ≤ 0.001≤ 0.001≤ 0.001
Iron (Fe) [%]≤ 0.001≤ 0.001≤ 0.001
Chelation value (mgCaCO3/g)≥ 339≥ 265≥ 215
PH value2.5-3.04.0-5.0 (5% aqueous solution)10.5-11.5 (5% aqueous solution)
AppearanceWhite crystalline powderWhite crystalline powderWhite crystalline powder
CharacteristicEDTA acid is soluble in alkaline solutions, such as solutions of sodium hydroxide, sodium carbonate, and ammonia.
Insoluble in cold water, alcohol and general organic solvents.
Good water solubility.
Insoluble in organic solvents such as ethanol and ether.
EDTA-2Na contains two crystal water, and easy to lose crystal water when drying.
Soluble in water, alkaline in aqueous solution. Slightly soluble in organic solvents such as ethanol.
EDTA-4Na contains 4 crystal water, and can lose part or all of its crystal water at high temperature.
EDTA and EDTA sodium salts

Related products


Traditonal Chelating Agents
Aminopolycarboxylates: EDTA acid, EDTA-Na/K, DTPA & DTPA-5Na/5K
Polyphosphonates: HEDP, DTPMP, ATMP


EDTA is widely used and is a representative substance of chelating agent. It can form stable water-soluble complexes with alkali metals, rare earth elements and transition metals. It is widely used in polymer chemical industry, daily chemical industry, paper industry, pharmaceutical industry, agriculture, textile printing and dyeing industry, aquaculture, photographic chemicals, oil field chemicals, water treatment agents, boiler cleaning agents and analytical reagents.

EDTA-2Na is an important complexing agent, used for complexing metal ions and separating metals, this product is used as bleaching fixing solution for color photographic material developing and processing, and dyeing auxiliary, fiber treatment agent, cosmetic additive, medicine, food, agricultural chemical microfertilizer production, blood anticoagulant, complexing agent, detergent, stabilizer, synthetic rubber, polymerization initiator and heavy metal quantitative analysis agent, etc.
In the chlorinated reduction initiation system for SBR polymerization, disodium EDTA is used as a component of the active agent, mainly for complexing iron ions and controlling the rate of polymerization reaction.

EDTA-4Na is a widely used metal ion chelating agent. It can be used in textile industry dyeing, water quality treatment, color sensitization, pharmaceutical, daily chemical, detergent, paper making and other industries as additive, activator, water purifier, metal ion masking agent and activator in butyl rubber industry. It is used in the dry acrylic industry to offset metal interference and improve the color and brightness of the dyed fabric.

25kg kraft paper bags, woven bags, plastic bags inside barrels, or packaging according to customer requirements.

Store in a dry and ventilated warehouse, avoid direct sunlight, store with attention to sunlight, moisture, fire prevention, lightly stacked and lightly placed.

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