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Why is the water in Henan salty?

Because the local water contains fluorine and arsenic. It may also be because the local sodium chloride (salt) content is high. In water, when the fluorine content is greater than 1.2mg/L, it is called excessive fluorine, also called high fluorine water. Soluble solid content >; 1500mg/L is called brackish water. Fluorine is a nonmetallic chemical element, which ranks ninth in the periodic table of elements and belongs to the main group element of the seventh group in the second cycle. Its chemical properties are so active that it can hardly exist alone. It exists in the state of various compounds in nature, widely exists in rocks, soils and oceans, and is widely distributed on the earth. China is a country with serious water shortage, with a per capita water resource of about 2400m3, which is only 1/4 of the global per capita water resource. Moreover, the spatial and temporal distribution is uneven, and the water environment is seriously polluted. Primary inferior water is widely distributed, especially in the arid inland areas of northwest China. Due to the scarcity of precipitation and strong evaporation, water resources are naturally scarce. Groundwater, as the main water supply source, generally has high salt content and high fluorine content. The main manifestations are high concentration of saline-alkali components, even high hardness, high fluorine, high arsenic, high iron and manganese, low iodine and low selenium, which have seriously affected the quality of life and health of local people for many years. The bitter water in China is mainly due to excessive use of water for a long time, or crustal changes, resulting in the water level being lower than sea level, seawater flowing backwards and surface water flowing through saline-alkali land. It mainly refers to lake water, river water and groundwater with salt content of1000 ~ 5000mg/L. The brackish water in China is mainly distributed in the arid inland areas of northwest China, the northern and eastern coastal areas. Bitter salt water contains a lot of heavy metals and harmful impurities, and it tastes bitter and difficult to drink directly. Long-term drinking will lead to gastrointestinal dysfunction and low immunity.