Overview
EDTA-2Na is the disodium salt of ethylenediaminetetraacetic acid (EDTA), one of the most important chelating agents in industrial chemistry. First synthesized in 1935, it has become indispensable in numerous applications due to its ability to bind metal ions. As a water-soluble white powder, EDTA-2Na offers practical advantages over the free acid form of EDTA. Its chemical stability and non-toxicity at typical usage levels make it suitable for food, pharmaceutical and cosmetic applications where safety is paramount.
Physical and Chemical Properties
EDTA-2Na crystals are hygroscopic and readily dissolve in water to form clear solutions. The compound shows exceptional stability across a wide pH range (2-12), maintaining its chelating ability under diverse conditions. Its most significant chemical property is the formation of stable, water-soluble complexes with nearly all metal ions. The chelation constants vary by metal, with particularly strong binding for calcium (log K = 10.7) and iron (log K = 14.3). This selectivity allows for targeted applications in metal ion control.
Main Applications
In water treatment, EDTA-2Na prevents scale formation by sequestering calcium and magnesium ions. The food industry uses it as a preservative (E386) to maintain color and texture by chelating metal catalysts of oxidation. The pharmaceutical sector employs EDTA-2Na in medications and as an anticoagulant in blood collection tubes. Cosmetic formulations utilize it to stabilize products by binding metal contaminants. Industrial cleaning processes benefit from its ability to dissolve metal oxide deposits.
Safety and Storage
While generally recognized as safe in regulated quantities, EDTA-2Na requires proper handling. Powder form may cause respiratory irritation; use dust masks in bulk handling. Skin contact should be minimized as it can enhance absorption of heavy metals. Store in original packaging at ambient temperature, protected from moisture. Shelf life typically exceeds 3 years when properly stored. Avoid mixing with strong oxidizers as this may cause decomposition.
B2B Procurement Guide
Industrial buyers should prioritize suppliers that provide complete technical data sheets with each batch. Key specifications include purity (typically 98-99%), heavy metal content (<10 ppm), and chloride/sulfate impurity levels. For large-scale procurement, consider bulk packaging options (25kg bags or supersacks) to reduce costs. Verify the manufacturer's quality certifications (ISO, GMP) when purchasing for food or pharmaceutical applications. Just-in-time delivery may be preferable due to the material's indefinite shelf life.
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