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The river water was contaminated with toxic metals including arsenic, copper, barium, cadmium, chromium, lead, mercury, nickel, and thallium. [2] Cleanup costs may exceed $1.2 billion. [3] A toxic heavy metal is a common but misleading term for a metal-like element noted for its potential toxicity. [4]
Selenium pollution might impact some aquatic systems and may be caused by anthropogenic factors such as farming runoff and industrial processes. [100] People who eat more fish are generally healthier than those who eat less, [101] which suggests no major human health concern from selenium pollution, although selenium has a potential effect on ...
Name Location Dependent population Description Sources of pollution Impact Bharalu River: Assam, India: One of the most polluted rivers in the state of Assam. [19] The biochemical oxygen demand of the river is 52 mg/L in compared to the permissible limit set by the National River Conservation Directorate (NRCD) at 3 mg/L. [20]
Metal toxicity or metal poisoning is the toxic effect of certain metals in certain forms and doses on life.Some metals are toxic when they form poisonous soluble compounds. . Certain metals have no biological role, i.e. are not essential minerals, or are toxic when in a certain for
Immediate tests showed increased amounts of arsenic and selenium, [6] but the river was deemed by state officials to be a safe source for drinking water. However, further tests showed the ash to contain pollutants including but not limited to arsenic, copper, selenium, iron, zinc and lead. [1]
These contaminants fall into two separate categories, acute and chronic effects. Acute effects occur within hours or days of the time that a person consumes a contaminant. [33] People can experience acute health effects from almost any contaminant if they are exposed to extraordinarily high levels (as in the case of a spill).
Low rates of selenium volatilization from selenate-supplied Muskgrass (10-fold less than from selenite) may be due to a major rate limitation in the reduction of selenate to organic forms of selenium in Muskgrass.
The USGS defined the biogeochemical pathway of selenium moving "from rock to duck” as the 'Kesterson effect". [13] The group of symptoms and effects observed in birds from research at Kesterson Reservoir is known as "Kesterson Syndrome". [14] Selenium is a naturally occurring element in the environment, and is an essential dietary nutrient.