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The electric kettle boils water repeatedly, and the water is unhealthy to drink. Is it true? -Alice factory

November 18, 2021

Some people believe that repeated heating of water will increase the amount of nitrite in the water, and that drinking such water will cause poisoning and even cancer. The nitrite contained in drinking water is generally converted from the original nitrate in the water. After the drinking water is boiled repeatedly, due to high temperature and lack of oxygen, part of the nitrate is converted into nitrite. In addition, due to the evaporation of water, the concentration of nitrite will increase.

Ingestion of foods with low levels of nitrite can supplement the nitrite in*. However, if too much nitrite is ingested at one time, it is easy to cause acute poisoning, which will oxidize low-iron hemoglobin, which has normal oxygen-carrying capacity in the blood, into methemoglobin, lose the oxygen-carrying ability, and cause tissue hypoxia, which is called methemoglobin. Blood disease. When the intake of nitrite reaches 0.2-0.5 grams, it can cause poisoning, and when it exceeds 3 grams, it can cause death. According to the regulations of relevant departments, the allowable daily intake of nitrite is 0-0.2 mg per kilogram of body weight. For an adult weighing 60 kg, the permissible daily intake of nitrite is equivalent to 0-12 mg.

So, how much nitrite is in the water that is repeatedly boiled?

A study by the Center for Disease Control and Prevention showed that for fresh bottled mineral water, as the number of repeated heating increases, the nitrite content in the hot water gradually increases. After heating to 52 times, the nitrite content It is 2.3 micrograms/liter. Later, in a study conducted by a teacher’s college, the barrel of purified water was heated 181 times, and the content of nitrite in the water was between 3-4 micrograms per liter. Whether it is heated 52 times or 181 times, the result is less than the maximum limit value of 5 micrograms/liter and 100 micrograms/liter of nitrite in my country's packaged drinking water (except mineral water) and mineral water. More importantly, if you want to reach the acutely toxic dose of 0.2 grams of nitrite, you can't just drink a few glasses of water. You need to drink tens of thousands of liters of water at a time. Obviously, this is impossible.

[Disclaimer: The above content comes from the Internet, and does not represent the views of this site. I hope some of the content can help you. 】


We (Alice) are a manufacturer specializing in the production of nameplates for home appliances. We have 21 years of experience in making furniture signs. We can produce zinc alloy, aluminum alloy, stainless steel, copper, brass, iron, and titanium. , PC, PET, PE, pvc and other different labels.

Contact us E-mail: sales03@alicelogo.com

whatApp: +86 132 6564 6796

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