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: IAEA - MEL International Atomic Energy Agency - IAEA-475 Coastal Sediment
New Agilent HPLC column for routine determination of arsenic species in human urine by HPLC-ICP-MS | EVISA's News
Liquid-liquid extraction in speciation analysis | EVISA's News
Link database: National Research Council: Arsenic in Drinking Water (Update 2001)
Material database: IRMM - Institute for Reference Materials and Measurements - BCR-664
Hungarians exposed to high arsenic levels in drinking water | EVISA's News
Link database: Chemical Fact Sheet: Thallium
Material database: Fluka Chemie GmbH - Arsenic atomic spectroscopy standard solution Fluka
Material database: IRMM - Institute for Reference Materials and Measurements - ERM-EC681m - Polyethylene (high level)
Link database: Arsenic and Uranium in Fertilizer
Lehigh University professor receives Astellas Award for arsenic groundwater remediation efforts | EVISA's News
Link database: CAMEO Chemicals: ARSENIC ACID, LIQUID
Link database: Chemical Fact Sheet: Uranium
Material database: IAEA - MEL International Atomic Energy Agency - IAEA-461 - Clam (Gafrarium tumidum)
Directory of scientists: Gregory A. Cutter
Material database: RECIPE Chemicals + Instruments GmbH - ClinCal 9985 Plasma calibrator lyophilised for trace elements
New Certified Reference Materials supporting the analysis of food supplements available | EVISA's News
Material database: IRMM - Institute for Reference Materials and Measurements - BCR-186 - Pig Kidney
Link database: CBI: Czech Republic legislation: Wood preserved with arsenic and chromium
Directory of scientists: Adrien Mestrot