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存放过久的水。饮用水存放时间长了,其中含氮的有机物会不断被分解成亚硝酸盐,还会有细菌污染。饮用后亚硝酸盐与血红蛋白结合,会影响血液的运氧功能。所以,在热水瓶里存放多日的开水、重复煮沸的残留水、沸腾很久的水,其成分都已发生变化而不能喝了。
Store too long water. Drinking water has been stored for a long time, of which nitrogen-containing organic compounds are continuously decomposed into nitrites and bacteria can be contaminated. Nitrite after drinking and hemoglobin combined, will affect the blood oxygen function. Therefore, in a thermos for many days of boiling water, repeated boiling water, boiling water for a long time, its composition has changed and can not drink.