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:

Workshop Arsenic 2005: Remediation of arsenic contamination of soils, surface and groundwater | EVISA's Agenda of Events
Material database: IAEA - MEL International Atomic Energy Agency - IAEA-140/TM Trace elements and methylmercury in seaweed
Material database: National Institute of Standards and Technology (NIST) - SRM 1635 - Trace Elements in Coal (Subbituminous)
Material database: Sigma-Aldrich - Matrix CRM - Soil, Sludge, Sediment: Trace Metals - Fresh Water Sediment 3
Material database: RECIPE Chemicals + Instruments GmbH - ClinCal 9943 Whole blood calibrator lyophilised for trace elements
Material database: Sigma-Aldrich - Matrix CRM - Soil, Sludge, Sediment: TCLP Metals - Sandy Loam 13
Directory of scientists: William R. Cullen
Arsenic-eating bacteria rewrite evolutionary history | EVISA's News
Link database: EFSA: Metals as contaminants in food
Material database: Institute of Nuclear Chemistry and Technology (INCT/ICHTJ) - INCT-MPH-2 MIXED POLISH HERBS
Material database: National Metrology Institute of Japan (NMIJ) - NMIJ CRM 7402-a: Trace Elements, Arsenobetaine and Methylmercury in Cod Fish Tissue
Material database: RECIPE Chemicals + Instruments GmbH - ClinChek 8931 - Urine Control lyophilised for Arsenic Species: LOT 035
Link database: Metal Speciation Toxicokinetics Database: Arsenic
Material database: National Institute of Standards and Technology (NIST) - SRM 2976 - Mussel Tissue (Trace Elements & Methylmercury) Freeze-dried
Material database: RECIPE Chemicals + Instruments GmbH - ClinChek 8880 Blood Serum Control lyophilised, trace elements level I: LOT 347
Material database: National Research Council of Canada (NRC - CNRC) - LUTS-1 - non defatted lobster hepatopancreas
Material database: Sigma-Aldrich - Matrix CRM - Soil, Sludge, Sediment: Trace Metals - Sandy Loam 11
Material database: Sigma-Aldrich - Matrix CRM - Soil, Sludge, Sediment: Trace Metals - Sewage Sludge 2
Material database: FAPAS - Test Material T07112 (Canned Crab Meat)
Scientists discover new broad-spectrum antibiotic based on arsenic | EVISA's News