E249：亚硝酸钾

亚硝酸钾，其化学名称“Potassium nitrite”在国际上常被简写为E249。这一编码系统广泛应用于食品工业、化学研究等多个领域，主要用于快速识别和标注。作为常见的食品添加剂，它在加工肉类等产品中发挥防腐和护色作用。

The thickness of surface stress layer is very different between the glasses strengthened by potassium nitrate and potassium nitrite.
经过硝酸钾和亚硝酸钾(E249)钢化处理后的玻璃表面应力层厚度有很大差别。
Accelerating the oxidization of bromocresol purple by potassium bromate with nitrite and its application
亚硝酸加速溴酸钾氧化溴甲酚紫测定食品中亚硝酸盐含量
These are ammonium thiocyanate, potassium iodide, sodium nitrite, and ammonium molybdenate.
试验表明，硫氰酸铵、碘化钾、亚硝酸钠和钼酸铵是可同时使用的注水示踪剂。
Condition of thin-layer scanning : silicon-gel H-0.8 % CMC-Na-0.8 % NaOH thin-layer sheet, Ethyl Acetate-Methanol-ammonia water ( 17 ∶ 2 ∶ 1 ) as expansion agent, improved bismuth and potassium iodide and 2 % sodium nitrite for atomizing develop;
薄层扫描条件：硅胶H-0.8%CMC-Na-0.8%NaOH薄层板，以乙酸乙酯-甲醇-氨水（17∶2∶1）为展开剂，改良碘化铋钾及2%亚硝酸钠喷雾显色；
It is based on the decrease in absorbance of the reaction eriochrome cyanine R with potassium bromate in dilute H3PO4 which is catalyzed by nitrite.
它基于在稀磷酸溶液中，依来铬青R与溴酸钾的反应受亚硝酸根催化而使吸光度降低。

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