Ask the chemistry master to answer: Why is drinking pure water poisonous?

Drinking water can also be toxic? Recently, some media said that drinking too much water will lead to "water poisoning". In this regard, Yang, a classmate of Nanjing University, was deeply touched. A few days ago, after she visited Sun Yat-sen Mausoleum with her classmates, she suddenly felt dizzy and depressed. According to the doctor's diagnosis, Yang was "water poisoning" due to improper drinking water. Why is drinking water toxic? What kind of water should we drink? Professor Wang Yulian, a medical expert, pointed out that the body fluids of healthy people are weakly alkaline. If the pH value of body fluid is lower than 7.35, a lactic acid compound will be produced in the human body, which will make the blood acidic for a long time and lead to various chronic diseases. The fundamental cause of human illness is acid-base imbalance. With the continuous improvement of people's living standards in Nanjing, people consume acidic foods (meat, eggs, rice flour, wine, etc.). ) is also increasing day by day, leading to the phenomenon of "human acidification" becoming more and more serious. Some data show that cardiovascular diseases, diabetes, cancer and other diseases are mostly related to human blood acidification. To achieve the goal of eliminating human acidification, it is necessary to complete it through water that is in close contact with acidic substances. However, the pH value of "pure water" is generally around 6.0, and the sanitary index of drinking water in China stipulates that the pH value is 6.5 to 8.5. The surface tension of "pure water" is relatively small, so it is difficult to play the role of "detoxification". On the contrary, due to excessive drinking of "acid water", organic substances in the human body are lost with the discharge of urine, which eventually leads to "water poisoning". Drinking pure water for a long time may affect your health. In hot weather, bottled mineral water and pure water are often the "treasures" that tourists carry with them. However, according to Dr. Chen from Jiangbei People's Hospital, although bottled mineral water and purified water can quench thirst, excessive drinking will lead to excessive salt loss in the human body, which will lead to mild "water poisoning". It is understood that "pure water" has become the daily drinking water of many Nanjing citizens, and some people even cook and cook soup with pure water. In this regard, experts reminded that "pure water" should not be used as daily drinking water for a long time, especially for infants and children. Experts pointed out that the current sanitary condition of pure water is worrying. At the same time, due to the change of water structure in the process of pure water reproduction, nutrients needed by human body cannot be sent to cells. In addition, after various physical, chemical and biological purification treatments, the raw water has removed trace elements and minerals needed by the human body, making it even more unsuitable for drinking. It is understood that there are nearly 100 pure water production enterprises in Nanjing, with a daily production capacity of 30 to 40 tons. Many of them are family-owned water-making enterprises with simple production technology and unsatisfactory sanitary conditions. These water-making enterprises generally have no quality supervision link, so they can't guarantee the quality of finished water. 3 The sanitary problem of bottled water can not be ignored. According to industry insiders, the bottled water itself has the problems of repeated use and unclean disinfection, especially the repeated use of water containers, which leads to excessive microbial indicators and nitrite, and unqualified conductivity to measure the purity of pure water. The expired use of water containers makes some chemicals dissolve in water, which poses a hidden danger to consumers' healthy drinking water. Drinking alkaline ionized water is good for health. In order to prevent the continuation of the phenomenon of "water poisoning", researchers have developed a kind of high-quality drinking water-alkaline ionized water, in addition to taking measures in various aspects. It is understood that the generation of drinkable alkaline ionized water should first filter and purify ordinary tap water to remove harmful impurities, and then use the principle of "like charges repel and opposite charges attract" in physics to make cations such as calcium, magnesium and other healthy electrolytes in water flow to the cathode of the electrolyzer when water is electrolyzed in the electrolyzer, thus forming directly drinkable alkaline ionized water. Alkaline ionized water has the characteristics of small water mass, strong permeability, strong solubility and rich new ecological oxygen, which can penetrate deep into human body and neutralize the accumulated acidic toxins in human body, thus achieving the purpose of human health. Nanjing people are expected to drink alkaline ionized water. It is understood that there are several enterprises developing and manufacturing alkaline ionized water equipment in Nanjing. In the past, due to market development problems and technical reasons, the application of alkaline ionized water technology in Nanjing has been hidden in the "boudoir". According to an industry insider, after the improvement of the first generation technology, the products currently developed have broken the "bottleneck" of high price, and at the same time, this technology pays more attention to the design for family use, and the scientific awareness of drinking water of Nanjing citizens is also constantly improving, so the application of this technology will gradually spread. People in the industry are optimistic that they are actively developing equipment for manufacturing alkaline ionized water suitable for large water supply enterprises, and this technology has attracted the attention of relevant departments. If it runs smoothly, Nanjing citizens are expected to drink alkaline ionized water within five years.