Post Date December, 02 2023
Generally, the one-time safe intake of nitrite for the human body is 0.2 mg per kilogram of body weight. According to the sanitary standards for drinking water, the content of nitrite should not exceed 10 mg/liter. If you drink no more than 10 liters of water at a time, it is safe.
Two primary school students in Beijing have demonstrated through scientific experiments that overnight water can be drunk!
They placed hot water in the Science and Technology Museum for one day, two days, and three days, and conducted comparative chemical analysis with water samples from tap water. The values of pH, phosphate, nitrate, dissolved oxygen, chlorine, and chemical oxygen consumption were determined to be within the normal range, which means that overnight water has no side effects on the human body and can be drunk.
The purpose of the experiment is: because I saw some government agencies pouring a large amount of overnight water, I want to use scientific experimental data to confirm that we can drink overnight water! And remind us to save water and avoid waste!
So far, there is no case where a large amount of cancer analysis data in medicine is caused by drinking plain boiled water overnight after waking up in the morning. Therefore, do not panic. When dealing with online rumors, we need to conduct rational analysis and believe in scientific evidence.
The Internet also said that after 16 hours of overnight boiled water, the total number of Escherichia coli bacteria would seriously exceed the standard. Expert Answer: Hu Wengang agrees that water has a shelf life, but he believes that "16 hours" has no scientific basis.
Moreover, the amount of water burned before going to bed at night, and drunk after waking up in the morning, cannot exceed 10 hours of sleep, not more than 16 hours.
Here's my suggestion: I hope everyone can use high-quality insulated cups to store water, and reserve a clean cup to pour water to drink. Avoid touching the water in your mouth and contaminating the water you haven't drunk with saliva.
Water is the source of life and nourishes everything. Don't worry, drink boldly!
The overnight period from 11pm to 7am is 8 hours, so you dare not drink. How dare you drink a glass of water during the day from 9 a.m. to 5 p.m? There is a devil coming out in the dark, scaring you to death.
In this way, all manufacturers of drinking fountains should close down, so it's impossible to finish drinking in a day with a bucket of words.
The saying that overnight water cannot be drunk originated from the Qing Dynasty. According to Yuan Mei's "Zunsheng Shu", "Those who spend the night drinking cold tea on the summer moon cannot eat it, and those who guard the palace have sexual immorality. When they see water, they must hand it over for fear of losing sperm.". The ancients have never said that it can transform human bones and muscles. What fear of spermatorrhea on it? It sounds so disgusting. At that time, people believed that geckos were poisonous. At night, when people fell asleep, they ran out, made love when they saw water, and semen dripped into the water. When people drank it, they became poisoned by geckos, turning their bones and flesh into water, and even the most invincible would be infected with obscenity.
Geckos are rarely seen in modern homes. Generally, the home is relatively clean, so this rule does not hold. The home is dirty and disorderly, except for the presence of cockroaches and mice.
Some people say that water left in the air for a long time can produce many bacteria, which can cause diarrhea when drunk. First of all, it is not so easy to become a bacterial culture medium. If plain water can be used as the culture medium, then our previous life of laboriously preparing the culture medium for cultivating bacteria in the microbiological laboratory will no longer exist. Like humans, bacteria need carbohydrates, nitrogen-containing substances, inorganic salts, and vitamins to grow. Water alone cannot grow, at least very slowly. Secondly, the topic refers to "cold boiled water". After boiling the water, it basically kills 99.9% of the bacteria, which can be considered sterile. In a clean and tidy home, the density of bacteria in the air is not so high, making it less susceptible to infection.
The only source of infection is oral bacteria. You know, there are more than 6 billion bacteria in the human mouth, more than the total number of people on Earth. There will be a large amount of bacteria entering the drinking water, and it is indeed unsafe to store it for a long time. This length of time varies from 2 to 8 hours depending on the cleanliness of the environment.
Therefore, the title should be changed to: After drinking water for a long time, it cannot be drunk.
However, the water in the drinking machine and heat preservation cup does not come into direct contact with the oral cavity, but only with the air. If it is stored for a long time, it will not grow bacteria. Drink it at ease.
