I believe you must understand the harm of water pollution, or you can imagine how serious the problem will be. But only intuitive figures can let us see the seriousness of the situation. Shaanxi Environmental Protection Integration will help you understand the truth of water pollution!
At present, there are 2 million new cancer patients in China, and the number of deaths caused by cancer is up to 1.4 million. According to the data provided by insiders, China has 243 cancer villages. In many areas, the incidence rate of cancer is higher than the incidence rate of cardiovascular and cerebrovascular diseases, which is the cause of death.
The existence of cancer villages makes us pay more attention to the safety of drinking water, and tap water is the most important thing related to drinking water. As we all know, the main source of tap water is surface water such as local reservoirs and rivers, and some areas are from deep well water. The water company can be said to be strict in the treatment of water source, but due to technology and other reasons, some harmful substances such as heavy metals, residual chlorine, bacteria can not be removed, laying a hidden danger for the health of residents.
In some areas of China, the surface water and groundwater have been seriously polluted, which has reached the edge of the cliff that kills people! Practice has proved that the nature of drinking water is closely related to cancer. When drinking water is polluted by toxic and harmful chemicals or pathogenic microorganisms, it can cause abnormal sensory properties of water and cause diseases. Long term intake can lead to cancer. In many regions of China, cancer has occurred in groups, including many cancer villages, cancer townships, cancer counties, and even cancer basins (such as some areas in the middle reaches of the Huaihe River). The culprit is often the large-scale pollution of drinking water.
Inorganic arsenic: no trace of carcinogenesis in drinking water
According to the assessment, the arsenic hazard in China, especially the drinking water type arsenic poisoning, will become a major drinking water sanitation problem in China in the 21st century. The 2007 edition of Food, Nutrition, Physical Activity and Cancer Prevention states that:
There is sufficient evidence to suggest that inorganic arsenic in drinking water is one of the causes of lung cancer, and inorganic arsenic contaminated water may be one of the causes of skin cancer. Arsenic and arsenide are considered carcinogens. Limited evidence suggests that inorganic arsenic contaminated water is one of the causes of renal and bladder cancer cancer.
Arsenic containing compounds are widely used in agriculture as herbicides, insecticides, fungicides, rodenticides and various preservatives. If they are used in large quantities, they will cause serious pollution to crops and increase the arsenic content in food. In addition, the groundwater (such as well water and hot spring) near arsenic bearing mineral deposits and other nonferrous metal mineral deposits has high arsenic content, which is one of the main sources of drinking water pollution.
Mutagenicity of arsenide
It has been confirmed that many arsenides have mutagenicity, which can lead to gene mutation, chromosome abnormalities and inhibit the repair of DNA damage. Sodium arsenate can pass through the placental barrier and has certain teratogenicity to mice. Epidemiological investigation shows that inorganic arsenic compounds are related to the occurrence of human lung cancer and skin cancer. It was confirmed by the WHO in 1982 that inorganic arsenic is a carcinogen and can induce a variety of tumors.
Arsenic poisoning area
Arsenic poisoning is also regional in China. There are two types of endemic arsenism in China, namely drinking water type and coal burning type. Arsenic poisoning in drinking water is caused by excessive arsenic content in drinking water. This type is mainly concentrated in Xinjiang, Inner Mongolia, Shanxi and Taiwan. Coal burning pollution type is caused by burning high arsenic coal, baking grain and pepper with coal fire, which seriously pollutes indoor air and food. This type is mainly seen in Guizhou Province at present.
The main symptoms of endemic arsenism are skin damage, including hyperkeratosis of palmar extension, peripheral neuritis, and increased incidence rate of skin cancer. The patient began to show intermittent claudication, and then the skin became dark, showing brown or dark brown spots. The palms and toes were highly keratinized, which could develop into skin cancer.
Water is the source of life, and the safety of drinking water is closely related to our health. Therefore, we must pay attention to water pollution and treatment plan. Solve the problem from the source of pollution.
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