Overview
Sodium nitrite is an inorganic compound produced industrially by absorbing nitrogen oxides in sodium hydroxide or sodium carbonate solutions. It serves as a versatile intermediate in chemical synthesis and has been used commercially since the early 20th century. As a food additive (E250), it prevents botulism in cured meats while imparting the characteristic pink color. In industrial contexts, its oxidizing properties make it valuable for corrosion inhibition in cooling systems and as a precursor in diazonium salt production for dyes.
Physical and Chemical Properties
Sodium nitrite forms deliquescent crystals that readily absorb moisture from air. It exhibits thermal instability, decomposing above 320°C to release oxygen and form sodium oxide and nitrogen oxides. The compound demonstrates strong oxidizing behavior, particularly in acidic conditions where it decomposes to release toxic nitrogen dioxide gas. Its ability to form stable complexes with hemoglobin (forming methemoglobin) underlies both its toxicity and its medical applications as an antidote for cyanide poisoning.
Main Applications
In the food industry, sodium nitrite functions as a preservative in cured meats (bacon, ham, sausages) at concentrations of 50-200 ppm. It inhibits Clostridium botulinum growth while enhancing flavor and color development. Industrial applications dominate global consumption, particularly in: 1) Diazo dye production as a nitrosating agent 2) Rubber industry as a polymerization inhibitor 3) Metal treatment for corrosion inhibition 4) Pharmaceutical synthesis for vasodilators and cyanide antidotes 5) Photography as a developer additive.
Safety and Storage
Sodium nitrite requires careful handling due to its acute toxicity (LD50 oral-rat: 180 mg/kg) and oxidizing nature. Workers should use PPE including nitrile gloves, goggles, and respiratory protection when handling powder forms. Storage must prevent contact with acids, reducing agents, and combustible materials. Bulk quantities should be kept in original, moisture-resistant containers in well-ventilated areas. Spills should be contained with inert absorbents and disposed as hazardous waste according to local regulations.
B2B Procurement Guide
Industrial buyers should specify purity requirements (typically 97-99% for most applications) and particle size when ordering. Technical grade suffices for corrosion inhibition, while food/pharmaceutical applications require USP or FCC grades. Consider transportation regulations - sodium nitrite is classified as UN1500 (Oxidizer, 5.1) for shipping. Reliable suppliers provide proper hazardous material documentation including SDS and transport emergency cards. Bulk purchases (25kg bags or 1-ton supersacks) typically offer 10-15% cost savings versus small-quantity orders.
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