近年来,由于用水紧张,居民常在家中备一口缸,平时装满水,待停水时用。其实这很不科学,长期食用这种储存了几天的水,会使人中毒得病。 水缸存水,时间越长,在空气中暴露的时间也越长,就越容易受空气中病原微生物的污染而变质;同时,水中细菌会不断生长和繁殖,将水中的硝酸盐还原成亚硝酸盐。亚硝酸盐对人体极为有害:首先,与人体内的血红蛋白结合,变成高铁血红蛋白,造成血液输氧困难。严重时能引起组织缺氧,出现皮肤发绀、头痛、恶心、呕吐、胸闷、心慌筹症状,甚至导致死亡,对婴幼儿危害尤其更大。其次,亚硝酸盐在人体肠道内,与有机胺反应生成一种强致癌物质——亚硝酸铵,可引发食 In recent years, due to water stress, residents often prepare a tank at home, usually filled with water, to be used when no water. In fact, this is very unscientific, long-term consumption of this stored a few days of water, will make people sick. Tank water, the longer the longer the exposure time in the air, the more vulnerable to the pathogenic microorganisms in the air pollution and deterioration; the same time, the bacteria in the water will continue to grow and reproduce, the nitrate in water reduced to Asia Nitrate. Nitrite is extremely harmful to the human body: first, it binds to hemoglobin in the human body and becomes methemoglobin, resulting in difficulty in blood oxygenation. Severe cases can cause tissue hypoxia, skin cyanosis, headache, nausea, vomiting, chest tightness, palpitation symptoms, and even lead to death, especially for infants and young children more harmful. Second, nitrite in the human intestine, with the organic amine react to produce a strong carcinogen - ammonium nitrite, can cause food