Arsenic

Arsenic is a chemical element with symbol As and atomic number 33. Arsenic occurs in many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. It was first documented by Albertus Magnus in 1250. Arsenic is a metalloid. It can exist in various allotropes, although only the gray form has important use in industry.

The main use of metallic arsenic is for strengthening alloys of copper and especially lead (for example, in car batteries). Arsenic is a common n-type dopant in semiconductor electronic devices, and the optoelectronic compound gallium arsenide is the most common semiconductor in use after doped silicon. Arsenic and its compounds, especially the trioxide, are used in the production of pesticides, treated wood products, herbicides, and insecticides. These applications are declining, however.

Arsenic is notoriously poisonous to multicellular life, although a few species of bacteria are able to use arsenic compounds as respiratory metabolites. Arsenic contamination of groundwater is a problem that affects millions of people across the world.

Read more about ArsenicCompounds, Occurrence and Production, History, Toxicity and Precautions

Other articles related to "arsenic":

Arsenic Toxicity - Exposure
... The oxides of arsenic are the most common threat since arsenite and arsenate salts are the most toxic ... Thus although arsenic poisoning can be related to human activities such as mining and ore smelting, the most serious problems are natural, resulting from water wells drilled into ... "Inorganic arsenic" (arsenate and arsenite salts) are more harmful than organic arsenic exposure ...
Arsenical Keratosis
... An arsenical keratosis is a growth of keratin on the skin caused by arsenic, which occurs naturally in the earth's crust and is widely distributed in the environment, Arsenical ... Arsenic is also found to be an environmental contaminant in drinking water (well water) and an occupational hazard for miners and glass workers ... Arsenic may also causes other conditions including Bowen's disease, cardiovascular diseases, developmental abnormalities, neurologic and neurobehavioral disorders, diabetes, hearing loss ...
Arsenic - Toxicity and Precautions - Biological Mechanism
... The high affinity of arsenic(III) oxides for thiols is usually assigned as the cause of the high toxicity ... Arsenic disrupts ATP production through several mechanisms ... At the level of the citric acid cycle, arsenic inhibits lipoic acid, which is a cofactor for pyruvate dehydrogenase ...
South Maury Island Environmental Issues - Gravel Mining On Maury Island - Arsenic Contamination
... have shown that the soil in some areas of Vashon-Maury Island has elevated concentrations of arsenic, lead, and cadmium, probably due to decades of copper ... When examined by area, the data indicates the most serious arsenic contamination is in South Vashon-Maury Island ... community raised new questions about the level of arsenic contamination for Vashon-Maury Island as a whole ...
Arsenical Keratosis - Treatment
... dimercaprol) may be helpful to correct acute arsenic exposure, but it has minimal or no effect for patients who had arsenic exposure a long time ago ... acitretin, etretinate) may be helpful in treating arsenic-induced cutaneous lesions and in reducing the risk of cutaneous and internal malignancy formation, especially in Bowman's disease ...