arsenic

Arsenic is a chemical element that has the symbol As and atomic number 33. Its Atomic Mass is 74.92. Its Ionic Charge is (3-). This is a notoriously poisonous metalloid that has many allotropic forms: yellow (molecular non-metallic) and several black and gray forms (metalloids) are a few that are seen. Three metalloidal forms of arsenic with different crystal structures are found free in nature (the minerals arsenic sensu strictu and the much rarer arsenolamprite and pararsenolamprite), but it is more commonly found as arsenide and arsenate compounds. Several hundred such mineral species are known. Arsenic and its compounds are used as pesticides, herbicides, insecticides and various alloys.

The most common oxidation states for arsenic are -3 (arsenides: usually alloy-like intermetallic compounds), +3 (arsenates(III) or arsenites, and most organoarsenic compounds), and +5 (arsenates(V): the most stable inorganic arsenic oxycompounds). Arsenic also bonds readily to itself, forming, for instance, As-As pairs in the red sulfide realgar and square As43- ions in the arsenide skutterudite. In the +3 oxidation state, the stereochemistry of arsenic is affected by possession of a lone pair of electrons.



The term "arsenic" was found in the following pages:

Material database: Sigma-Aldrich - Matrix CRM - Soil, Sludge, Sediment: Trace Metals - Sandy Loam 8
Link database: Toxicology by Steven G. Gilbert: A Small Dose of Arsenic
Instrument database: GBC Scientific Equipment Ltd. - 908AA Atomic Absorption spectrophotometer
Material database: JRC - Joint Research Centre - BCR-185R - Bovine Liver
Link database: US FDA: Questions & Answers: Apple Juice and Arsenic
Material database: International Atomic Energy Agency (IAEA) - IAEA-436A Tuna Fish Flesh Homogenate
Material database: IRMM - Institute for Reference Materials and Measurements - BCR-038 - Fly ash from pulverized coal
Material database: RECIPE Chemicals + Instruments GmbH - ClinChek 8842 Whole blood, lyophilized, trace elements level III
Material database: Sigma-Aldrich - Matrix CRM - Soil, Sludge, Sediment: TCLP Metals - Sandy Loam 8
Material database: RECIPE Chemicals + Instruments GmbH - ClinChek 8883 Control blood plasma, lyophilised, trace elements level I: LOT 1286
Material database: Sigma-Aldrich - Matrix CRM - Soil, Sludge, Sediment: Trace Metals - Sandy Loam 9
Material database: National Metrology Institute of Japan (NMIJ) - NMIJ CRM 7901-a - Arsenobetaine solution
Material database: National Institute of Standards and Technology (NIST) - SRM 1633b - Constituent Elements in Coal Fly Ash
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Material database: IRMM - Institute for Reference Materials and Measurements - IRMM-804 Rice Flour
Material database: Laboratoire de toxicologie - QM-H-Q1412 - Human hair
Link database: Encyclopedia of Earth: Arsenic (in the Environment)
Methylmercury in fish: Can you cook it out ? | EVISA's News
8th International Congress on Arsenic in the Environment | EVISA's Agenda of Events