The rapid development of industry and agriculture, although this is a good thing, but at the same time there will be some shortcomings. Among them, the water environment pollution is becoming more and more serious. The phenomenon of excessive selenium in water is also common. The industrial wastewater containing selenium is mainly from the industry where selenium is produced and used. Such as: smelting selenium-containing metal ores, oil refining, thermal power generation, pigments and special glass and other industries. Pollution of water environment caused by selenium and its compounds.
We know that selenium is an essential element for the human body, but selenium deficiency and excess are not good, and selenite acid in water is a common pollutant. Among them, coal power industry, glass and ceramic industry, copper, zinc and lead ore roasting industry, semiconductor and electronics industry, as well as pigments, dyes, rubber, metallurgy and other industrial production and application process will discharge selenium wastewater. Selenium often exists in the form of selenate and selenite in water, and selenite ion can be reduced to fine granular elemental selenium under acidic conditions. Excessive intake of selenium can stimulate the human eyes and respiratory system, and cause gastrointestinal disorders in severe cases.
The toxicity and bioavailability of selenium mainly depend on its state. In most cases, selenium exists in the form of selenate ion (SeO42-) and selenite ion (SeO32-). Selenates and selenites are both water-soluble and toxic to organisms in high concentrations. The element selenium is generally considered non-bioavailable because it is insoluble in water. Hydrogen selenide (H2Se) is a highly toxic gas, which can be quickly oxidized into non-toxic elemental selenium in the air. Under strong reduction conditions, it will form insoluble selenium metal precipitate.
Remember! Don’t assume that selenium is an essential element regardless of how much it is. According to the relevant requirements, water quality online monitors are installed in the sewage discharge ports of major industries to carry out real-time detection, so as to determine whether the selenium in the water exceeds the standard and poses a threat to the ecological environment and human health. The T8000-Se total selenium online analyzer produced by Hangzhou Modi is used to detect the content of selenium in water!
