在全国各地亚硝酸钠中毒的事件屡有发生。造成亚硝酸钠中毒的原因是多方面的，但其中一个不可忽视的原因是人们对亚硝酸钠的性质、危害及其鉴别缺乏正确全面的认识。亚硝酸钠（NaNO2）在外观上和袋装精食盐（NaCl）极相似，两者比重几乎相等，而且亚硝酸钠和食盐都具咸味。因此 Sodium nitrite poisoning throughout the country have occurred frequently. The causes of sodium nitrite poisoning are manifold, but one of the reasons that can not be ignored is the lack of a correct and comprehensive understanding of the nature, harm and identification of sodium nitrite. Sodium nitrite (NaNO2) is very similar in appearance to sachet salt (NaCl) and has almost the same specific gravity, with both sodium nitrite and salt being salty. therefore