Analysis of sodium nitrite
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Sodium nitrite, which acts as an anti-polymerization agent, is used in the extraction of both isoprene and butadiene. I would like to know how the concentration of sodium nitrite in the extractant is determined
GB 1907-2003 Food Additives – Sodium Nitrite; GB 2367-2006 Industrial Sodium Nitrite; GB/T 633-1994 Chemical Reagents – Sodium Nitrite; TB/T 2059.3-2006 Methods for Analyzing Diesel Locomotive Coolants – Part 3: Determination of Sodium Nitrite. I also conduct analyses of sodium nitrite, but in the case of industrial raw materials. They are all redox titrations; the first two involve direct titration with potassium permanganate, the third one is a back-titration using sodium thiosulfate, and for the fourth one, it’s unclear as no information is available.