EDTA·Na₄ is a widely used chelating agent in water treatment, detergents, textiles, and pharmaceuticals. Proper packaging and storage are critical to maintain its stability and effectiveness.
1. Packaging Requirements
(1) Primary Packaging
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Material:
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Plastic Bags (HDPE or LDPE-lined) – Most common for industrial-grade EDTA·Na₄.
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Multi-layer Kraft Paper Bags – With inner polyethylene coating for moisture resistance.
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Fiber Drums (for bulk quantities) – Lined with plastic to prevent moisture absorption.
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Sealing: Must be airtight to prevent clumping due to hygroscopicity.
(2) Secondary Packaging
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Cardboard Boxes (for smaller quantities, e.g., 25 kg bags).
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Wooden Pallets (for bulk storage and transport).
(3) Labeling
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Chemical Name: “Tetrasodium EDTA” or “EDTA·Na₄”.
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CAS No.: 64-02-8.
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Hazard Symbols: Generally non-hazardous, but may carry irritant warnings.
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Storage Instructions: “Keep dry, store in a cool place.”
2. Storage Conditions
| Factor | Recommended Condition | Risks if Not Followed |
|---|---|---|
| Temperature | 15–30°C (Avoid >40°C) | Degradation at high temps |
| Humidity | <60% RH (Store in dry place) | Absorbs moisture, clumping |
| Light Exposure | Protect from direct sunlight | Possible slow decomposition |
| Ventilation | Well-ventilated area | Prevents dust accumulation |
| Shelf Life | 2–3 years (if sealed properly) | Loses efficacy over time |
Special Notes:
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Do not store near acids or strong oxidizers (risk of reactions).
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Keep away from food and feed (not toxic but not food-safe unless specified).
3. Handling Precautions
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Personal Protection:
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Gloves (powder may cause mild skin irritation).
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Dust mask (if handling large quantities to avoid inhalation).
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Spill Management:
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Sweep up (avoid water to prevent dissolving).
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Store spilled material in a dry container.
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4. Transportation Guidelines
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Land/Sea: Non-hazardous, but should be protected from moisture (sealed containers).
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Air Freight: Generally permitted, but check local regulations.
5. Common Issues & Solutions
| Issue | Cause | Solution |
|---|---|---|
| Clumping/Caking | Moisture absorption | Store in airtight containers with desiccants |
| Discoloration | Long-term light exposure | Use opaque packaging |
| Reduced Efficacy | Old stock (>3 years) | Test before use |
Conclusion
For optimal stability, EDTA·Na₄ should be:
✅ Packaged in moisture-proof bags or drums.
✅ Stored in a cool, dry, and ventilated place.
✅ Kept away from acids, oxidizers, and humidity.
Following these guidelines ensures long shelf life and consistent performance in industrial applications.