The correct way to boil water:
1, when the water boils (80℃-90℃), open the lid.
Doing so can make some organic pollutants in the water evaporate with the steam when heating.
2. Wait for the water to boil for about 3 minutes before turning off the fire.
This is because the tap water at home has been chlorinated to remove impurities such as microorganisms. But at the same time, chlorine interacts with the residual organic matter in water, which will form some harmful compounds. But if you boil for 3 minutes, the harmful compounds in the water will be reduced, and it will become safe drinking water at this time.
3, water can not be boiled repeatedly, it is best to drink now.
Flowing water has a certain self-purification ability, and the most ideal drinking water is fresh water. If water molecules are at rest, they will become aged water. If minors drink it regularly, it will obviously slow down cell metabolism and affect growth and development; Middle-aged and elderly people often drink it, which will accelerate aging. However, the deep well water, which has just been pumped out and is constantly moving, only contains 0.0 17 mg of nitrite per liter.
Precautions for drinking water:
1, freshly boiled tap water
Many people like drinking boiled water, but do you know? You can't drink water once it is boiled. Because our tap water is chlorinated and disinfected, the combination of chlorine and residual organic matter in water will produce carcinogenic compounds such as halogenated hydrocarbons and chloroform.
Step 2 stay out of water for a long time
If boiled water is left for a long time, the nitrogen-containing organic matter in it will be continuously decomposed into nitrite. In particular, boiled water stored for a long time is bound to be contaminated by bacteria. At this time, the decomposition of nitrogen-containing organic matter will be accelerated and more nitrite will be formed. After drinking such water, nitrite will combine with hemoglobin and affect the oxygen transmission function of blood.
3. Repeatedly boiled water
Nowadays, more and more families use electric kettles. Many people can't finish boiling water at once, and then boil it repeatedly. Or boil the remaining warm water in the thermos bottle before drinking, in order to save water, coal (gas) and time. These practices are not worth taking.