Overview
Ethylenediaminetetraacetic Acid (EDTA) is a synthetic amino acid derivative renowned for its exceptional chelating properties. Developed in the 1930s, it has become indispensable across multiple industries due to its ability to bind and neutralize metal ions. Its versatility stems from the six binding sites (four carboxylate groups and two amine groups) that form stable complexes with cations like calcium, magnesium, and heavy metals. In its disodium salt form (EDTA-2Na), it gains enhanced water solubility, expanding its utility in liquid formulations. The compound is produced through the reaction of ethylenediamine with formaldehyde and sodium cyanide, followed by hydrolysis. Global production exceeds 100,000 tons annually, serving sectors from wastewater treatment to biomedical research.
Physical and Chemical Properties
EDTA exists as a white, odorless crystalline powder with limited solubility in water (0.5 g/L at room temperature). Its solubility significantly improves in alkaline conditions or when converted to salt forms like EDTA-2Na or EDTA-4Na. The compound decomposes at 250°C without melting, releasing nitrogen oxides and carbon monoxide. As a hexaprotic acid (H6Y2+), it undergoes stepwise deprotonation with pKa values ranging from 0 to 10. This property enables pH-dependent chelation efficiency. EDTA forms 1:1 complexes with most metal ions, with stability constants (log K) varying from 8.7 for Ca2+ to 25.1 for Fe3+. These complexes remain stable across wide temperature and pH ranges, making EDTA effective in harsh industrial environments.
Main Applications
In water treatment, EDTA prevents scale formation by sequestering calcium and magnesium ions. It's crucial in boiler systems and cooling towers, with typical dosages of 1-10 ppm. The food industry employs it (E385) to preserve color and texture in canned products by chelation of metal catalysts that cause oxidation. The pharmaceutical sector utilizes EDTA in anticoagulant tubes (as K2EDTA or K3EDTA) and in chelation therapy for heavy metal poisoning. Cosmetic formulations incorporate it at 0.1-0.3% to stabilize products by inactivating metal contaminants. Industrial cleaning applications include metal surface treatment and detergent boosters, where it removes metallic deposits without corrosive effects.
Safety and Storage
While EDTA has low acute toxicity (LD50 > 2,000 mg/kg in rats), prolonged exposure may cause kidney damage due to mineral depletion. Powder forms require NIOSH-approved dust masks during handling to prevent respiratory irritation. Spills should be contained with inert absorbents and disposed as hazardous waste in many jurisdictions. Storage recommendations include airtight containers in temperature-controlled areas (<30°C) with relative humidity below 65%. Incompatible materials include strong oxidizers and reactive metals. Shelf life typically exceeds 3 years when stored properly. Transportation regulations vary by form: powder is usually non-hazardous, while concentrated solutions may require special labeling.
B2B Procurement Guide
Industrial buyers should specify technical (≥99%), food (FCC grade), or pharmaceutical (USP/EP) purity requirements. Bulk purchases (tonnage quantities) commonly use 25kg woven bags with polyethylene liners, while laboratory-scale procurement opts for 1kg bottles. Key certifications include ISO 9001 and REACH compliance documentation. Asian manufacturers dominate global supply, with China producing approximately 60% of world output. Price fluctuations correlate with glycine and sodium cyanide feedstock costs. Strategic buyers monitor these raw material markets and consider long-term contracts during price troughs. Sample testing for heavy metal content and assay purity is recommended before large orders.
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