World Health Organization: Arsenic contamination of groundwater should not be neglected
Groundwater is an important part of water resources. Because of its stable water quantity and good water quality, it is one of the important water sources for agricultural irrigation, industry, mining and cities. Especially in arid and semi-arid areas where surface water is scarce, groundwater often becomes the main source of water supply. Therefore, once groundwater is polluted, the impact is inestimable.
The rapid development of industry has destroyed the environment to a certain extent, especially the water quality pollution. The amount of chemical fertilizers and pesticides used in agricultural production is also increasing year by year. Water pollution also diffuses from point to surface. There is a water pollution phenomenon that can not be ignored, that is, arsenic pollution of groundwater.
Arsenic, ranking 33 in the periodic table of chemical elements, is a widespread metal-like element in nature. It is mainly combined with sulfur-bearing rocks and minerals. It is known as its oxide. Under some special geological, geomorphological, climatic and hydrological conditions, arsenic-bearing minerals dissolve and release arsenic into underground aquifers, resulting in natural C of underground drinking water, long-term drinking of groundwater with excessive arsenic, vulnerable to endemic arsenic poisoning in drinking water (referred to as "ground arsenic disease"), and serious cases can lead to lung cancer and skin. Cancer and other cancers. The standard for industrial treatment of arsenic-containing wastewater is no more than 0.5 mg/liter. The United States Environmental Protection Agency (EPA) and the World Health Organization (WHO) set the allowable concentration of arsenic in public drinking water to be no more than 0.01 mg/liter.
(Source: Water Treatment Online Author: Anonymous)
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