What is low fluorine water?

Fluorine is a lively nonmetallic element, which can react with many elements and compounds and has a wide range of uses. They all exist in the form of compounds in nature. Fluorine is one of the indispensable trace elements in human life activities. Fluorine has many physiological functions. It is generally believed that fluorine participates in the normal metabolism of human body. Proper amount of fluorine can maintain the normal calcium and phosphorus metabolism of the body and promote the calcification of teeth and bones, thus ensuring the normal growth and development of teeth and bones. At the same time, proper amount of fluoride can prevent dental caries and have certain influence on nerve conduction and metabolic enzyme system. Long-term intake or inhalation of water, food or air with high fluorine content can cause endemic fluorosis, also known as endemic fluorosis. Due to different environmental media carrying fluorine, the types of endemic fluorosis are different, so endemic fluorosis can be divided into drinking water type, domestic coal pollution type, diet type and industrial pollution type. Judging from the current situation, endemic fluorosis exists in different degrees in other provinces, municipalities and autonomous regions in China except Shanghai, which is distributed in 1 187 counties (cities, districts and counties), with a population of about 330 million, more than 40 million patients with dental fluorosis and more than 2.6 million patients with skeletal fluorosis. Therefore, it is of great significance to establish the hygienic standard of fluorine in drinking water, air, grain and vegetables to protect residents' health. The current standards in China are as follows: drinking water should not exceed1.0 mg/L; The once maximum allowable concentration in the atmosphere is 0.02mg/m3, and the daily maximum allowable concentration is 0.007mg/m3；. Rice, flour, beans, vegetables and eggs are less than or equal to 2.0mg/kg, fruit is less than or equal to 0.5mg/kg and meat is less than or equal to 2.0mg/kg. .