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DISODIUM ETHYLENEDIAMINETETRAACETATE（EDTA-2NA）
Chemical Formula: C₁₀H₁₄N₂Na₂O₈·2H₂O
Molecular Weight: 372.24
CAS No.: 6381-92-6
EINECS No.: 205-358-3
Introduction
Disodium EDTA (EDTA-2Na) is a white or off-white crystalline or granular powder, odorless with a faintly salty taste. It is highly soluble in water but poorly soluble in ethanol.
As a versatile chelating agent, EDTA-2Na effectively binds metal ions in solutions. It prevents discoloration, spoilage, and cloudiness caused by metals while inhibiting the oxidative loss of vitamin C. Additionally, it enhances the antioxidant stability of oils and fats by neutralizing trace metal catalysts (e.g., iron, copper) that accelerate oxidation.
Widely used in dyes, food, pharmaceuticals, and other industries, EDTA-2Na was classified as Generally Recognized as Safe (GRAS) by the U.S. FDA in 1985.
Specifications
| Item | Specifications |
|---|---|
| Appearance | White crystalline powder, soluble in water |
| Assay, % (as C10H14N2Na2O8·2H2O) | min 99.0 |
| Identification | Meet the requirements |
| Loss on drying (105℃, 3h), % | max 0.3 |
| Residue on ignition, % | max 0.2 |
| pH value (1% solution) | 4.3~4.7 |
| Nitrilotriacetic acid | Pass the test |
| Cyanide (as CN), ppm | max 1.0 |
| Arsenic (as As), ppm | max 3.0 |
| Lead (as Pb), ppm | max 10.0 |
| Heavy metals (as Pb), ppm | max 20.0 |
Functions and Applications
Disodium EDTA (EDTA-2Na) – Applications
Food Uses (Compliant with GB 2760-2014 Standard)
EDTA-2Na is approved for use in the following food categories with specified maximum limits:
- Jams, vegetable pastes/sauces (except tomato sauce): 0.07g/kg
- Preserved fruits (limited to sweet potato products), pickled vegetables, canned vegetables, canned nuts/seeds, and canned multigrain products: 0.25g/kg
- Compound condiments: 0.075g/kg
- Beverages (excluding packaged drinking water): 0.03g/kg
Industrial Uses
EDTA-2Na is widely utilized in:
- Cleaning products: Detergents, liquid soaps, shampoos.
- Agriculture: Chemical sprays, water treatment (chelating agent, pH adjuster, antifoulant).
- Photography: Bleach-fix solutions in color film processing.
- Rubber manufacturing: Acts as a key component in redox initiation systems for styrene-butadiene rubber (SBR) polymerization, where it controls reaction rates by chelating ferrous ions.