The Guidelines for Drinking Water Quality formulated by the World Health Organization (WHO) clearly stipulates that only "safe water" can meet its 3 1 water quality index, and safe water is drinking water that is harmless to human body.
Many experts put forward the concept of "healthy water". In addition to all the conditions of safe water, healthy water must also meet a series of indicators such as hardness, total dissolved solids and silicon dioxide. , in which the PH value must be greater than 7.
According to the national standard for drinking water formulated by China, the PH value of drinking water is between 6.5 and 8.5, and the optimal value is 7.5.
The Health Drinking Water Professional Committee of Chinese Medical Association believes that drinking water that meets the following conditions is more in line with human needs:
It does not contain any substances that are toxic, harmful and peculiar smell to human body, with moderate hardness, alkaline pH value, appropriate mineral content and proportion required by human body, and moderate dissolved oxygen and carbon dioxide content in water.
Water clusters are small, and the binding angle between water molecules is large, which is close to the binding angle between human molecules, and has strong nutritional and physiological functions such as water solubility, permeability and diffusion.
Extended data
Choice of drinking water
1. Brand purchase is preferred for large-scale enterprises and well-known brands. Drinking water has been included in the quality and safety market access management, and all products should be marked with QS.
2. Look at the product label: the qualified product label should clearly indicate its product name, net content, manufacturer's name, address, production date, shelf life, product standard number and other contents.
3. Identify the sensory quality of water: Qualified drinking water should be colorless, transparent, clear, odorless and tasteless, and there is nothing visible to the naked eye. Yellow color, turbidity, flocculent precipitation or impurities, water with peculiar smell must not be drunk.
4. Once the bottled water and bottled water are opened, they should be used up as soon as possible and cannot be stored for a long time. It is best to put it in a dark, ventilated and cool place.
5. When buying a pure water machine, it depends on the sanitary condition of the machine, the inspection of machine management, the replacement of filter elements and the record of cleaning frequency. Try to choose those with good sanitary conditions, machine tube inspection, filter element replacement and high cleaning frequency.
Hygienic standard for drinking water-Baidu Encyclopedia