Good art book, let me correct some of your mistakes: Water that has been boiled repeatedly is water that has been boiled repeatedly. Generally speaking, boiled water in households refers to water that has been boiled to kill most harmful bacteria. But drinking water is toxic. There are two types of poisons: 1. Bacterial poison (ubiquitous) 2. Mineral poison (rarely found only in certain mountainous regions rich in mineral resources). eliminated by heating alone. Additionally, heating can cause some initially beneficial and harmless elements to chemically react with the oxygen present in the water and transform them into toxic oxides (Okay... you have to call me obscene...) and the water diversion machine. you mentioned that purified water generally refers to almost "absolutely pure" H2O obtained by removing all bacteria and miminerals present in water by the method of distillation (don't ask me to explain this to you...) (but long-term consumption of distilled water will cause a lack of trace elements in humans . However, don't always drink mineral water if you don't remember it clearly. that it's because of the water that you're feeling uncomfortable, so switch to a bottled water brand If the discomfort persists, check your water fountain again. to wash it?! The water is clean but may be contaminated.
Please refer to Guoke.com's rumor crusher from last year. 'boiling water' will have no significant impact on the human body.
http://www.guokr.com/post/17654/
Conclusion: partly true. Nitrites present in drinking water are en carcinogenic and toxic effects and increase with repeated heating. However, nitrites obtained from drinking water are much lower than those obtainable from other foods, and their impact on humans is limited.