EDTA 2Na, Disodium EDTA, 139-33-3

EDTA 2Na, Disodium EDTA, 139-33-3

EDTA 2NA (DISODIUM EDTA)

CAS 139-33-3 | C₁₀H₁₄N₂Na₂O₈

SECTION 1: PRODUCT IDENTITY AND DEFINITION

Description: EDTA 2Na (Disodium EDTA) is a versatile chelating agent. It is the disodium salt of ethylenediaminetetraacetic acid. It is a white, odorless, crystalline powder that is soluble in water. It functions by forming stable complexes with metal ions such as calcium, magnesium, iron, copper, and zinc, effectively "trapping" them and preventing them from participating in unwanted reactions. This property makes it invaluable in water treatment, detergents, cosmetics, food preservation, pharmaceuticals, and agriculture.

SECTION 2: SYNONYMS AND OTHER NAMES

SECTION 3: CHEMICAL STRUCTURE AND PROPERTIES

Structural Formula:

text

    OOC - CH₂         CH₂ - COO⁻
           \         /
            N - CH₂ - CH₂ - N
           /         \
    OOC - CH₂         CH₂ - COO⁻
                      
             2 Na⁺

    Ethylenediaminetetraacetic Acid Disodium Salt (EDTA 2Na)

Description: EDTA 2Na is a hexadentate chelating agent, meaning it can form six coordinate bonds with a metal ion. The molecule contains two amine nitrogen atoms and four carboxylate oxygen atoms that act as donor atoms. In the disodium salt form, two of the four acidic hydrogens are replaced by sodium ions, making the compound water-soluble. The remaining two hydrogens can be neutralized upon binding to metal ions, releasing protons. This structure allows EDTA to form extremely stable 1:1 complexes with polyvalent metal ions.

SECTION 4: PHYSICAL AND CHEMICAL PROPERTIES

SECTION 5: CHELATION MECHANISM

Description: EDTA 2Na acts by forming extremely stable, water-soluble complexes with metal ions. The chelation process involves the coordination of the metal ion by the four carboxylate oxygen atoms and the two amine nitrogen atoms of the EDTA molecule, forming five-membered rings. This encapsulating structure effectively "traps" the metal ion, preventing it from participating in undesirable chemical reactions such as oxidation, precipitation, or catalysis. The stability of the metal-EDTA complex varies with different metal ions, with Fe³⁺ forming the most stable complex (Log K = 25.1) and Mg²⁺ forming the least stable (Log K = 8.7).

SECTION 6: APPLICATIONS

SECTION 7: INDUSTRIAL APPLICATION DETAILS

7.1 Water Treatment

• Application: Water softening and scale prevention

• Mechanism: Binds Ca²⁺ and Mg²⁺ ions, preventing them from forming insoluble carbonates and sulfates

• Typical Concentration: 1 – 10 ppm (continuous) / 50 – 200 ppm (shock treatment)

7.2 Detergents and Cleaning Products

• Application: Improves cleaning efficiency

• Mechanism: Binds metal ions (Ca²⁺, Mg²⁺) that interfere with surfactants

• Typical Concentration: 0.1 – 1.0%

• Advantages: Enhances foam stability, prevents soil redeposition

7.3 Cosmetics and Personal Care

• Application: Formulation stabilizer and chelating agent

• Mechanism: Binds metal ions that can catalyze oxidation and rancidity

• Typical Concentration: 0.05 – 0.5%

• Common Products: Shampoos, conditioners, creams, lotions, soaps

7.4 Food Industry

• Application: Antioxidant synergist and preservative

• Mechanism: Binds metal ions (Fe³⁺, Cu²⁺) that catalyze oxidation

• Typical Concentration: 0.01 – 0.1% (food additive)

• Benefits: Maintains color, flavor, and texture; prevents rancidity

7.5 Pharmaceuticals

• Application: Anticoagulant and excipient

• Mechanism: Binds Ca²⁺ ions required for blood clotting

• Typical Concentration: 0.5 – 1.0 mg/mL

• Usage: Blood collection tubes (purple top), topical preparations

7.6 Agriculture

• Application: Micronutrient availability

• Mechanism: Binds metal ions; increases solubility and plant uptake

• Typical Concentration: 0.1 – 0.5%

• Advantages: Prevents metal ion precipitation; improves nutrient delivery

SECTION 8: COMPARISON WITH OTHER EDTA SALTS

SECTION 9: REGULATORY STATUS

SECTION 10: SAFETY AND TOXICOLOGICAL PROFILE

GHS Classification:

• Not classified as hazardous for health

• May cause eye irritation (Category 2)

Safety Recommendations:

• S26: In case of eye contact, rinse immediately with plenty of water and seek medical advice

• S36/37: Wear suitable protective clothing and gloves

• S45: In case of accident, seek medical advice

SECTION 11: STORAGE AND SHELF LIFE

Packaging Options:

• 25 kg multi-layer paper bags with PE inner liner

• 25 kg HDPE drums

• 1 kg, 5 kg, 10 kg (upon request)

SECTION 12: QUALITY CERTIFICATES AND STANDARDS

SECTION 13: DISCLAIMER AND LEGAL NOTICE

DISCLAIMER (LEGAL NOTICE): This Technical Data Sheet (TDS) is for informational purposes only and does not constitute a binding specification. The values stated herein are based on typical laboratory results. The user is solely responsible for determining the suitability of the product for the intended application and for ensuring compliance with all local regulations. A current Safety Data Sheet (SDS) and Certificate of Analysis (COA) should be requested prior to use. Allergic reactions are rare but possible in sensitive individuals; suitability tests should be conducted. This document does not grant any license or patent rights for use of the product.