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 1762a - Low Alloy Steel
Link database: Hazardous Substances Data Bank: Arsenic Trioxide
Material database: SUPELCO by Sigma-Aldrich - Arsenic(V) sulfide
Link database: CAMEO Chemicals: ARSENIC ACID, LIQUID
Material database: National Institute of Standards and Technology (NIST) - SRM 363 - Chrom-Vanadium Steel (Modified)
Link database: CBI: The Netherlands legislation: Wood preserved with arsenic and chromium
Material database: National Institute of Standards and Technology (NIST) - SRM 2976 - Mussel Tissue (Trace Elements & Methylmercury) Freeze-dried
Link database: Arsenic speciation in seafood
Why should elemental speciation be done ?
1 Mio $ prize offered for a solution against arsenic in drinking water | EVISA's News
Bangladeshi scientists get prestigious award for arsenic filter | EVISA's News
Link database: CBI: UK legislation: Wood preserved with arsenic and chromium
Material database: National Institute of Standards and Technology (NIST) - SRM 3669 - Arsenic Species in Frozen Human Urine (Elevated Levels)
Material database: RECIPE Chemicals + Instruments GmbH - ClinChek 8880 Blood Serum Control lyophilised, trace elements level I: LOT 347
Link database: Chemical Fact Sheet: Arsenic
Directory of scientists: Michael Krachler
Link database: NIH: Report on Carcinogens: Arsenic and Inorganic Arsenic Compounds
Material database: National Research Council of Canada (NRC - CNRC) - DORM-2
Material database: RECIPE Chemicals + Instruments GmbH - ClinCal 9943 Whole blood calibrator lyophilised for trace elements LOT 1296
Directory of scientists: Miroslav Stýblo