Tetrasodium EDTA (4Na): A Powerful Heavy Metal Chelator for Industrial and Environmental Applications
Molecular Formula: C₁₀H₁₂N₂O₈Na₄ · 4H₂O
Molecular Weight: 452.23
CAS No.: 13235-36-4
Product Grades:
- Industrial Grade
- Daily Chemical Grade
- Spray Tetrasodium
- Tetrasodium Dihydrate
Specifications:
| Item | Industrial Grade | Daily Chemical Grade | Spray Tetrasodium | Tetrasodium Dihydrate |
| Purity (%) | ≥99.0 | ≥99.5 | ≥99.3 | 107-109 |
| Chloride (Cl) (%) | ≤ 0.01 | ≤ 0.01 | ≤ 0.01 | ≤ 0.01 |
| Sulfate (SO₄, %) | ≤ 0.05 | ≤ 0.05 | ≤ 0.03 | ≤ 0.05 |
| Heavy Metals (Pb, %) | ≤ 0.001 | ≤ 0.001 | ≤ 0.001 | ≤ 0.001 |
| Iron (Fe, %) | ≤ 0.001 | ≤ 0.001 | ≤ 0.0005 | ≤ 0.001 |
| Loss on Drying (%) | ≥ 220 | ≥ 220 | ≥ 220 | ≥ 234 |
| Chelation Value (mg CaCO₃/g) | 10.5-11.5 | 10.5-11.5 | 10.5-12.5 | 10.5-11.5 |
| NTA (%) | ≤ 1.0 | ≤ 0.1 | ≤ 3.0 | —— |
| Density (g/L) | —— | —— | 600-800 | —— |
| Appearance | White Crystal Powder | White Crystal Powder | White Powder | White Crystal Powder |
Characteristics:
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Appearance: Tetrasodium Ethylenediaminetetraacetic acid is typically a white crystalline powder, and the specific appearance can vary slightly depending on the grade.
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Chelation Value: Tetrasodium EDTA is a strong chelating agent, and its ability to form stable complexes with metal ions is crucial in various applications such as water treatment, agriculture, and cosmetics.
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Purity: The purity of this compound ranges from 99.0% to 99.5%, with the industrial-grade material typically offering the lowest purity level, and the daily chemical grade having higher purity requirements.
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Chemical Composition: It contains sodium (Na) and ethylenediaminetetraacetic acid (EDTA), and in the form of dihydrate, it includes water molecules that aid in its solubility and stability.
Uses and Applications:
Tetrasodium EDTA is widely used across various industries due to its chelating properties:
- Water Treatment: It helps in softening water by binding to metal ions like calcium and magnesium, preventing scaling and corrosion.
- Cosmetics and Personal Care: Used as a stabilizer and preservative by sequestering metal ions that could cause product degradation.
- Detergents: It improves the effectiveness of surfactants by binding to metal ions in the water.
- Agriculture: In fertilizers, EDTA is used to make micronutrients more available to plants by binding to trace metals.
- Industrial Cleaning: It can enhance the cleaning process by removing metal ions from surfaces or solutions.
