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 -Silt Clay 1
Material database: RECIPE Chemicals + Instruments GmbH - ClinCal 9988 Urine calibrator lyophilised for trace elements: LOT 122
Material database: IAEA - MEL International Atomic Energy Agency - IAEA-476 Fish Homogenate
Material database: National Metrology Institute of Japan (NMIJ) - NMIJ CRM 7901-a: Arsenobetaine solution
Capabilities of EU labs to determine inorganic arsenic in food have improved | EVISA's News
Link database: US FDA: Arsenic in Rice and Rice Products
Material database: National Analysis Center for Iron & Steel (NACIS) - NCS ZC73014 Trace Elements in Tea
Journals database: Phosphorus, Sulfur, and Silicon and the Related Elements
Link database: ATSDR: ToxFAQs for Arsenic
Two new Thio-Arsenosugars found in Scallops | EVISA's News
Link database: CBI: France legislation: Wood preserved with arsenic and chromium
Material database: National Institute of Standards and Technology (NIST) - SRM 2677a
Material database: IRMM - Institute for Reference Materials and Measurements - ERM-DB001: Trace Elements in Human Hair
Highly selective Cr(VI) determination at ultra-trace levels using on-line trapping of Cr(III) with ICP-MS detection | EVISA's News
New Certified Reference Materials supporting the analysis of food supplements | EVISA's News
Material database: National Institute of Standards and Technology (NIST) - SRM 363
Workshop Arsenic 2005: Remediation of arsenic contamination of soils, surface and groundwater | EVISA's Agenda of Events
Link database: Hazardous Substances Data Bank: Arsenic, elemental
Material database: National Institute of Standards and Technology (NIST) - SRM 726 - Selenium, Intermediate Purity
Link database: US FDA: Arsenic in Rice and Rice Products (09/2012)