Potassium nitrite

Potassium nitrite (CAS 7758-09-0, E249) is an inorganic potassium salt of nitrous acid, available under designations including Potassium Nitrite ACS and potassiumnitrite(1:1). It is classified under EC 231-832-4 and carries the food additive designation E 249 within the European Union.

In cured meat processing, potassium nitrite inhibits Clostridium botulinum growth by reacting with myoglobin to form nitrosomyoglobin, simultaneously fixing colour and extending shelf life. In pharmaceutical manufacturing, it serves as a reagent in diazotisation reactions and as a reference standard in analytical applications requiring ACS-grade purity.

Potassium nitrite is supplied in food-grade (E249), ACS, and pharmaceutical-grade forms, with compliance to FCC and Ph.Eur. monographs available depending on grade. It falls under REACH regulation and is classified as an oxidising solid requiring appropriate handling documentation. Packaging is typically offered in 25 kg bags or fibre drums. HS code 28341000 applies.