Description
EDTA 4Na, also known as tetrasodium EDTA, is a powerful and widely used chemical compound.EDTA (ethylenediaminetetraacetic acid) is a versatile chelating agent, meaning it can bind to and sequester metal ions. This property makes it useful in a wide range of applications across various industries, including medicine, food, cosmetics, and manufacturing.
Chemical Properties
| Property | Specification / Value |
| Chemical Name | Tetrasodium Ethylenediaminetetraacetate |
| Common Name | EDTA-4Na |
| Chemical Formula | C₁₀H₁₂N₂Na₄O₈ |
| Molecular Weight | ~380.17 g/mol |
| Appearance | White crystalline powder or granules |
| Odor | Odorless |
| Solubility | Freely soluble in water; insoluble in organic solvents |
| pH (1% aqueous solution) | 10.5 – 11.5 |
| Chelating Ability | Strong chelating agent for Ca²⁺, Mg²⁺, Fe³⁺, Cu²⁺ |
| Stability | Stable under normal conditions; stable in alkaline media |
| Hygroscopic Nature | Slightly hygroscopic |
| Thermal Decomposition | Decomposes on heating; no sharp melting point |
| Functionality | Sequestering agent, water softener, metal ion stabilizer |
| Compatibility | Compatible with most surfactants and formulation ingredients |
Uses
Detergents and Cleaning Products: EDTA 4Na is a primary ingredient in many detergents and cleaning formulations. It acts as a “detergent adjuvant” by sequestering metal ions in hard water (e.g., calcium and magnesium). This prevents these ions from interfering with the effectiveness of the surfactants, allowing the detergents to work more efficiently, leading to better cleaning results.
Water Treatment: Due to its ability to bind to metal ions, EDTA 4Na is widely used to soften water and remove heavy metals and other contaminants. This is crucial for preventing scale buildup in pipes and equipment, which can extend their lifespan and improve operational efficiency in systems like boilers and cooling towers.
Textile and Paper Industries: In the textile industry, EDTA 4Na prevents metal ion impurities from altering the color of dyed fabrics, ensuring more vibrant and uniform results. In the pulp and paper industry, it inhibits the catalytic action of metal ions (especially manganese) that can degrade hydrogen peroxide, which is used in chlorine-free bleaching processes. This helps achieve a brighter, whiter paper.
Agriculture: It’s used in some fertilizers to chelate metal nutrients, making them more soluble and readily available for absorption by plants.
Synthetic Rubber Production: EDTA 4Na can act as a catalyst in the polymerization process of synthetic rubber.
Cosmetics and Personal Care Products
Stabilizer and Preservative: In shampoos, soaps, lotions, and other personal care products, EDTA 4Na chelates metal ions that can cause products to spoil, lose their effectiveness, or change color. By binding to these ions, it increases the shelf life and enhances the performance of other ingredients.
Foaming Agent: It can improve the foaming properties of products like shampoos.
Other Uses
Metal Cleaning: It’s used in some cleaning solutions to remove rust, corrosion, and scale from metal surfaces (with the exception of aluminum), as it is less corrosive than acidic cleaners.
Laboratory and Research: In analytical chemistry, it is used in complexometric titrations to accurately measure the concentration of various metal ions in a sample.
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