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: National Institute of Standards and Technology (NIST) - SRM 2587 - Trace Elements in Soil (contains lead from paint)
Link database: FDA: Arsenic in Pear Juice Analytical Results, 2005-2011
Journals database: Phosphorus, Sulfur, and Silicon and the Related Elements
Directory of scientists: Dirk Wallschläger
Link database: OSHA Method 1006: Arsenic, Cadmium, Cobalt, Copper, Lead, and Nickel
Material database: IRMM - Institute for Reference Materials and Measurements - ERM-CE278k - Mussel tissue
Material database: National Metrology Institute of Japan (NMIJ) - NMIJ CRM 7402-a Trace Elements, Arsenobetaine and Methylmercury in Cod Fish Tissue
Material database: IRMM - Institute for Reference Materials and Measurements - ERM-EC681K POLYETHYLENE (high level)
Material database: Sigma-Aldrich - Matrix CRM - Soil, Sludge, Sediment: TCLP Metals - Sandy Loam 8
Material database: National Institute for Environmental Studies (NIES) - NIES CRM 27: Typical Japanese Diet
Unexpected arsenic compounds found in some low rank coals | EVISA's News
Material database: Sigma-Aldrich - Matrix CRM - Soil, Sludge, Sediment: Trace Metals - Sewage Amended Soil
Link database: CAMEO Chemicals: Arsenic bromide
Link database: Chemical Fact Sheet: Silicon
Material database: National Metrology Institute of Japan (NMIJ) - NMIJ CRM 7901-a: Arsenobetaine solution
UCSC oceanographer Kenneth Bruland honored | EVISA's News
2006: Winter Conference on Plasma Spectrochemistry | EVISA's Agenda of Events
Lehigh University professor receives Astellas Award for arsenic groundwater remediation efforts | EVISA's News
Material database: National Research Council of Canada (NRC - CNRC) - SLRS-6: River Water Certified Reference Material for Trace Metals and other Constituents
Material database: IRMM - Institute for Reference Materials and Measurements - ERM- CD281 - Rye Grass