Can you boil boiling water a second time?

Boiling water boils and boils again to drink. Boiling water is boiled and boiled twice, as long as the water itself is not contaminated, it can be drunk. However, it is not recommended to boil the water repeatedly or boil it for too long to drink, because the water may be contaminated and will have an impact on human health.

Repeatedly boiling water, may have a greater risk of bacteria in the water, bacteria and dust in the water may affect the human body, and it is difficult to ensure that the boil to 1, bacteria can not be guaranteed to be destroyed, if the drinker has weak gastrointestinal function, may have diarrhea, bloating and other uncomfortable symptoms. In addition, if the water boiled a few days ago is boiled a second time, there is a greater possibility of unclean substances, and it is not recommended to continue drinking.

It is recommended to drink the boiled water on the same day, if the boiled water is not drunk on the same day, special attention should be paid to the storage environment and method, such as covering the lid to avoid foreign objects falling into the water and preventing contamination by bacteria in the air.

From a health point of view, boiled water can be boiled again, but not repeatedly.

Boiled water can be re-boiled without any harm to the body, but repeated boiling will evaporate and concentrate the water and nitrite.

As the concentration increases, some nitrates are decomposed into nitrite by heat, which is not good for health.

Therefore, it is recommended to drink the boiling water as soon as possible after boiling, and do not store it for a long time. But boiling water is not as long as possible, because the longer it is boiled, the more volatile the water is.

The harmful substances and nitrite will be concentrated due to the evaporation of water, and the content is relatively high, and drinking such water is also harmful to the body.

Precautions for boiling water in electric kettles

Don't drink freshly boiled water: Many people wait for the water to boil and pour water to drink without delay, but in fact, they don't drink freshly boiled water, because the chlorine in tap water combines with residual organic matter in the water to produce chloroform.

and other carcinogenic compounds. It is recommended that the lid of the boiling water container be turned open when the water is about to boil, and then boil for another 3 minutes before turning off the heat, and then leave it for a while before drinking.

Do not turn on the electricity first, and then fill the water; Do not use an electric kettle to cook anything with acid, alkali or salt to avoid corroding the kettle and generating heat.

Utensil. Carefully check for pot water leakage around the bakelite socket before powering it on after each water filling.

The above content refers to Encyclopedia - boiled water.

The water is boiled, and the spring can generally be boiled a second time.

From a health point of view, it is possible to continue drinking water if it is boiled twice, but it is best not to boil the water repeatedly, after boiling it once, before the next drink, as long as it is heated to drink.

Although water can be boiled twice, it is not recommended to boil water overnight. There will be a certain concentration of nitrite in the overnight boiling water, which is a harmful substance to the human body, although the impact is not particularly large, but long-term drinking will be harmful to health.

If you usually drink purified water or mineral water, there is no need to boil the water at all, as long as the water is heated and you can drink it, because the two types of water are filtered themselves, and if you boil it, the nutrients in it will be lost.

Recommended daily water intake:

Under normal circumstances, if an adult is engaged in light physical labor, he should drink 1500 1700 ml of water per day; If you are engaged in manual labor in a high-temperature environment, how to increase the amount of water intake.

In addition to the water drunk every day, the meal also contains a certain amount of water, so the normal water intake plus the water in the diet, a person's daily water intake of about 2700 3000 ml is more appropriate. <>

Boiling water can be boiled a second time.

But water should not be boiled repeatedly. Water vaporizes a portion of it when it is boiled, and repeated boiling causes a large amount of mineral components to remain in the remaining water, producing nitrite, which is not good for health.

After boiling boiled water, after being left in the air for 16 hours, the total number of E. coli will seriously exceed the standard, therefore, the shelf life of boiled water after boiling is only 16 hours, and it is recommended to drink it up within this time.

From a health point of view, boiling water can be boiled a second time, and when we usually say that we can't drink "a thousand boiling water", we are not talking about boiling water twice, but water that has been boiled many times.

When the water is boiled, it vaporizes a part, and if it is boiled many times, a large amount of mineral components remain in the remaining water, and the concentration is very high.

Water that cannot be drunk in life:

1. Raw water: Raw water contains a variety of microorganisms and viruses, which cannot be directly drunk, and can be infected with fungi, parasites, viruses and so on.

2. Aging water: Aged water is also called stagnant water, water that has been stored for a long time, and there are few active water molecules in this water, and long-term drinking will increase the risk of esophageal cancer and stomach cancer.

3. Thousands of boiling water: Thousands of boiling water is water that has been boiled many times, and the content of minerals in this water is very high, which will increase the risk of liver and kidney stones after drinking.

4. Unboiled water: Unboiled water is similar to raw water, and fungal and viral infections are possible, and it will also increase the risk of carcinogenesis and teratogenicity.

Boiling water can be boiled a second time. Boiled water can be reheated when it cools. The biggest advantage of boiling water is that most of the bacteria, viruses, and fungi that remain in the water can be killed by high temperature when boiling for a few minutes to tens of minutes.

After the boiled water becomes cool, if it is stored for too long, bacteria and other microorganisms will invade, and it is generally heated at this time. Prevent vomiting, diarrhea and other symptoms of infection after drinking, especially infants and young children with weakened immunity are more likely to have digestive symptoms.

Water that has been boiled twice can be drunk. From a health point of view, boiling water can be boiled a second time, and we usually say that we can't drink "thousand boiling water", not the second boiling water, but the water that has been boiled many times, and the water will vaporize part of it when it is boiled, and repeated boiling will cause a large number of mineral components to remain in the remaining water.

The concentration is very high, and after drinking, it will increase the risk of liver, kidney, stomach, and intestinal stones, and the mineral concentration in the water boiled twice does not reach the pathogenic concentration at all, so you can drink it.

Usually said that you can't drink the second boiled water, it should be said that the overnight water or long-term storage of boiling water boiled again, boiled water is the same as other food, should not be stored for a long time, overnight boiling water will have a certain concentration of nitrite, this ingredient is a carcinogen, although the concentration is not high. However, long-term drinking will gradually be enriched, so that it can cause disease.

The friends have probably heard the elders say that boiling water cannot be boiled repeatedly. Even if you discard the water and turn it back on, you don't want to drink overnight water that has been reheated. This is contrary to our philosophy of water conservation.

Why is there a saying that boiling water cannot be re-boiled?

First, the nitrite content in the secondary boiling water increases. When tap water is boiled overnight, the nitrite content in the water increases with the number of re-boils or the time it is left out. Data show that nitrite can cause poisoning as much as one gram or three grams can cause death.

At the same time, esophageal cancer is positively correlated with the amount of nitrite ingested by patients. In the environment of gastric acid, nitrite reacts with secondary amines, tertiary amines and amides in food to form nitrosamines, which are strong carcinogens.

Second, experiments have confirmed. Combined with the drinking habits in daily life, the experimental team designed and adapted to the repeated boiling of pure water and tap water, that is, the nitrite content was determined after being placed for different times. They repeatedly boiled tap water and purified water in different groups, boiled once every 20 minutes, boiled 30 times per hu, sampled and tested every two hours, and left to stand for 24 hours after boiling.

They then tested the tap water that had been boiled for 24 hours, and after the purified water was left for another 24 hours, the final change in nitrite content from 24 hours to 120 seconds showed an overall upward trend. After the tap water and purified water were boiled and kept warm, the nitrite content did show an upward trend.

Third, microorganisms mutate and multiply. After boiling the water overnight, the nitrite content in the water was in line with our drinking standards. However, although there is no need to worry too much about this problem, if the overnight tea is not closed, the longer it is, the more microorganisms will multiply, and more dust may fall in.

Water can usually be boiled a second time, and drinking water that is boiled a second time is generally not harmful to the body. However, it is generally not recommended to boil water repeatedly and drink it, as it may affect your health to a certain extent.

No, you can't drink reboiled water; This kind of water is boiled for too long, and the water has a high content of non-volatile substances, such as calcium, magnesium and other heavy metal components and nitrite. Drinking this water for a long time will interfere with people's gastrointestinal function, causing temporary diarrhea and bloating; Toxic nitrite can also cause hypoxia in the body, and in severe cases, coma, convulsions, and even death.

It is not possible to boil the water for the second time, because the second boiling of water will cause a lot of sediment to be produced in the water, and these substances cannot be discharged after entering the body.

Boiling water can be boiled a second time.

Under normal circumstances, the water is boiled and then heated and boiled after it has cooled, so that there will be no safety problems when boiling once or twice.

However, if you use an automatic heating tool (such as a kettle, water dispenser, etc.), it will automatically reheat as long as the temperature is low to a certain level.

If the water in the water heater is heated repeatedly for more than ten hours or several days (some people call it "thousand boiling water") and is not replaced, the water may contain high health hazards, such as harmful substances dissolved in heating elements and containers, and some trace harmful substances contained in the raw water will also accumulate.

Even if the "overnight boiling water" has been boiled many times and left for 48 hours, the nitrite content of the experimental surface is only 6, which is still far from the national standard of 1mg l nitrite for drinking water.

The nitrite content of the secondary boiled water is only trace and is within the safe drinking range.

It is recommended to drink the boiling water on the same day, if the boiled water is not drunk on the same day, special attention should be paid to the storage environment and method, such as covering the lid to avoid foreign objects falling into the water to prevent contamination.