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: Argus Chemicals srl - Arsenobetaine
Material database: Sigma-Aldrich - Matrix CRM - Soil, Sludge, Sediment: Trace Metals - Sand 1
Link database: Encyclopedia of Earth: Health effects of arsenic
Material database: NIES - National Institute for Environmental Studies - CRM 8: Vehicle Exhaust Particulates
Material database: SUPELCO by Sigma-Aldrich - Arsenic(III) oxide
Material database: United States Pharmacopeial Convention (USP) - Roxarsone
Material database: NIES - National Institute for Environmental Studies - CRM 18: Human Urine
Material database: IRMM - Institute for Reference Materials and Measurements - BCR-146R - Sewage sludge
Link database: Encyclopedia of Earth: Secondary arsenic minerals in the environment
Material database: Strem Chemicals, Inc. - Dimethylarsinic acid (Cacodylic acid)
Material database: National Institute of Standards and Technology (NIST) - SRM 2976
Material database: Sigma-Aldrich - Matrix CRM - Soil, Sludge, Sediment: TCLP Metals - Sandy Loam 6
Material database: Argus Chemicals srl - Monomethylarsonic acid, disodium salt
Material database: IAEA - MEL International Atomic Energy Agency - IAEA-433 Trace Elements and Methylmercury in Marine Sediment
Link database: US FDA: Product Safety Information: 3-Nitro (Roxarsone) and Chicken
Material database: IRMM - Institute for Reference Materials and Measurements - BCR-277R - Estuarine Sediment
Link database: Chemical & Engineering News: Eating arsenic
Link database: US EPA: Basic Information about Arsenic in Drinking Water
Directory of scientists: Florence Pannier
Material database: JRC - Joint Research Centre - ERM-CE278k - Mussel tissue