Overview
Sodium nitrite granular is an essential industrial chemical with the formula NaNO₂. As an ionic compound, it dissociates in water to form nitrite ions (NO₂⁻), which give it versatile chemical properties. Primarily manufactured through the absorption of nitrogen oxides in sodium hydroxide or carbonate solutions, this granular form offers better handling and controlled dissolution compared to powdered variants. It's regulated in food applications due to its toxicity at high doses.
Physical and Chemical Properties
The granular form exhibits higher stability than powders, with reduced dust formation during handling. Its melting point at 271°C makes it suitable for high-temperature industrial processes. As a strong oxidizing agent, sodium nitrite reacts vigorously with reducing agents and ammonium salts. Its aqueous solution is alkaline (pH ~9) and decomposes when heated above 320°C, releasing toxic nitrogen oxides.
Main Applications
In food processing (E250), it inhibits Clostridium botulinum growth in cured meats while imparting the characteristic pink color. The meat industry consumes approximately 60% of global production. Industrial uses include rubber chemical blowing agents, heat transfer salts, and corrosion inhibitors in closed-loop water systems. It's also a precursor for azo dyes and pharmaceuticals like vasodilators.
Safety and Storage
Classified as GHS06 (toxic) and GHS03 (oxidizer), sodium nitrite requires strict handling protocols. Storage areas must be segregated from acids and organic materials to prevent dangerous reactions. Bulk containers should be moisture-proof to prevent caking. Spills should be neutralized with reducing agents like sodium thiosulfate before cleanup with adequate respiratory protection.
B2B Procurement Guide
Industrial buyers should specify technical grade (≥97%) or food grade (≥99%) based on application. Food-grade purchases require documentation of heavy metal limits (As <3 ppm, Pb <10 ppm). Consider packaging options: 25kg woven bags with PE liners for small quantities or 1-ton bulk bags for large-scale users. Verify supplier compliance with local regulations (e.g., EU Regulation (EC) No 1333/2008 for food use).
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