In many people's minds, overnight water and thousand rolls of water are synonymous with "harmful" substances. Among them, thousand rolls of water is especially attacked by people, and it is considered that the harmful substances exceed the standard and are easy to cause cancer. The reasons they gave are probably as follows:
First: "The content of microorganisms and nitrite in the overnight water increases, and frequent drinking overnight water can cause cancer."
Second: "Thousands of boiling water have boiled too many times, and all the harmful substances in the container have entered the water"!
So, Thousand Rolling Water and Overnight Water are really "harmful water", are they not only toxic but also carcinogenic? Those who dare not drink have a look.
1. The experiment proved: Can I drink Thousand Boiling Water and Overnight Water?
In order to find out whether these two are really harmful, someone did an experiment. First of all, we have prepared several water boiling tools commonly used at home, including electric kettles, iron pots, aluminum pots, induction cookers, etc. We will use these tools to boil several pots of "different water" in turn.
Secondly, the water we choose is common tap water with no impurities in it, which is raw water that cannot be drunk directly.
After the experiment started, we first put the tap water into the electric kettle, iron kettle, aluminum kettle, and induction cooker in turn, and then let them start to boil the water. In order to compare whether the "thousand boiling water" really causes the increase of nitrite, we Specially let the water roll "5 minutes" and "20 minutes" for comparison.
After the water in all the tools was boiled for five minutes, we collected appropriate samples for analysis and research, and found that the nitrite content in the thousand boiling water in the electric kettle was 0.0018mg/L, and the aluminum kettle was 0.0022mg/L , The iron kettle is 0.0018mg/L, and the induction cooker is 0.0031mg/L. It can be seen that the content of nitrite in the boiled water is also different if the container is different.
waited for them to roll for another 20 minutes,We did another analysis. The data are as follows: 0.0028mg/L, 0.0034 mg/L, 0.0025 mg/L, 0.0033 mg/L. It is very intuitive to feel that the more times and the longer the time, the more water is in the water. The higher the content of nitrite, will it affect people's health?
We don’t need to worry about this.
pointed out in my country’s "Drinking Water Standards" that the daily nitrite content in drinking water of Chinese residents should be ≤1mg/L. In the above data, we can see that the water has been boiled for 20 minutes. The nitrite content is only a few mg/L, which does not affect the health of the human body at all. Therefore, the thousand boiled water should belong to the category of normal drinking and rest assured.
Is there any problem with overnight water?
We did not discard the water in the above thousand bouncing water experiment, but placed them in an environment with the same conditions for 24 hours to find out whether the harmful substances in the "overnight water" would exceed the standard.
The time is very fast, and the next day is coming soon, and we did a non-stop measurement of nitrite in the "overnight water" boiled in these kinds of containers. The results are as follows.
The nitrite content in the overnight water in the electric kettle increased to 0.0061mg/L, the nitrite content in the overnight water in the aluminum kettle increased to 0.0085 mg/L, and the nitrite content in the iron kettle increased to 0.0095 mg/L , The nitrite content in the overnight water in the induction cooker was reduced to 0.011 mg/L instead.
To sum up, whether it is a thousand boiled water and overnight water, their overnight water content is far below the level required by the state, so you can drink these water with confidence, it will definitely not cause you to cancer.
However, we found in our experiments that the boiling container has an impact on the quality of the water.
2. Is it better to boil water in an iron pot or an aluminum pot?
The factor that affects human health is not only the indicator of nitrite. Therefore, in addition to monitoring the nitrite content in the water boiled by each boiling tool,By the way, I also checked the content of metal element in each water, and the results surprised us.
In the water boiled by electric kettles, iron kettles, and induction cookers, apart from a small amount of iron, almost no other metal elements can be detected. Iron is an important metal element that our human body needs daily, so these three boiling tools belong to Normal boiling water tools are harmless to the body.
But when we got to the aluminum pot, we found that the aluminum element in the water it boiled seriously exceeded the standard. The longer it was cooked, the higher the aluminum element content. This made us worry. Aluminum is a metal element that is harmful to the human body. .
my country strictly stipulates that the content of aluminum in the daily drinking water of Chinese residents shall not exceed 0.2mg/L. However, the aluminum element in the water boiled in an aluminum pot is about 10 times this value. If we use an aluminum pot to boil water for a long time, the aluminum element in the body will seriously exceed the standard.
Aluminum is a metal element that is not needed by the human body and is difficult to metabolize. Its great harm to the human body is mainly reflected in the brain harm and liver and kidney harm.
When there is too much aluminum in the human body, it will accumulate in the organs, especially the brain, and reduce the person’s IQ and response ability. If a woman consumes too much aluminum during pregnancy, it may cause abnormal brain development in the fetus and give birth to mentally retarded children. . When aluminum accumulates in the liver and kidneys, it can also cause liver and kidney failure, and the risk factor is very high.
Therefore, aluminum pot boiling water may be the most dangerous of all boiling tools. If we can avoid aluminum pots, let's avoid aluminum pots.
3. What should I pay attention to when boiling and drinking water?
1. Try to avoid limescale when boiling water with an iron kettle
In daily tap water, there are a lot of calcium ions and magnesium ions. When we use iron kettles to boil water, the effect of high temperature The lower calcium and magnesium ions are active, and then it will replace the iron ions of in the iron kettle. Therefore, if the iron kettle boils over time,There will be a layer of calcium sulfate or magnesium sulfate precipitation at the bottom. Long-term use of this kettle to boil water may cause excessive intake of magnesium ions.
So, when scale appears on the bottom of the iron kettle, we can pour in a suitable amount of white vinegar, then boil it and then pour it away. After cleaning it again, you will find that the iron kettle is cleaner than when you bought it new.
2. Do not waste water
When we boil and drink water daily, we should save, not only boil as much water as we drink, don’t throw it away.
In 9.6 million square kilometers of China, there are still many places where water is not available. In the northwestern region of our country, there are countless families waiting for water resources. Therefore, we must stop wasting water resources.
3, overnight water is not separated for several nights
Although the overnight water can be drunk, it is still recommended that you should limit this time limit to 24h. Because under the influence of environment and humidity, the growth rate of bacteria is also different, and the way people preserve water is also different.
If your kettle is turned on all day long, don't drink it overnight. There will be a lot of dust and bacteria in it. Try not to drink the same water after several days.
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