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: Food Analysis Performance Assessment Scheme (FAPAS) - Test Material T07121 (Canned Fish)
Link database: Arsenic and Uranium in Fertilizer
Directory of scientists: Dulasiri Amarasiriwardena
New Agilent HPLC column for routine determination of arsenic species in human urine by HPLC-ICP-MS | EVISA's News
Material database: National Institute of Standards and Technology (NIST) - SRM 2669 - Arsenic Species in Frozen Human Urine
Material database: IRMM - Institute for Reference Materials and Measurements - BCR-402
Link database: SSWM: Arsenic Removal Techniques
Material database: IRMM - Institute for Reference Materials and Measurements - BCR-664
Material database: The Food and Environment Research Agency (FAPAS) - Test Material T07112 (Canned Crab Meat)
Visualizing the bioaccumulation of arsenic in a fern | EVISA's News
Material database: Canadian Certified Reference Materials Project (CCRMP) - GTS-2a Gold Ore Mill Tailing
Material database: RECIPE Chemicals + Instruments GmbH - ClinCal 9988 Urine calibrator lyophilised for trace elements: LOT 432
Material database: Strem Chemicals, Inc. - Dimethylarsinic acid (Cacodylic acid)
Material database: IAEA - MEL International Atomic Energy Agency - IAEA-405 - Trace Elements and Methylmercury in Estuarine Sediment
Material database: American Elements - Triphenylarsine Oxide
Material database: JRC - Joint Research Centre - ERM-AC626 Arsenobetaine in Water
A silent pandemic: Industrial chemicals are impairing the brain development of children worldwide | EVISA's News
Material database: Canadian Certified Reference Materials Project (CCRMP) - CUPD-1 Copper Anode
Link database: US EPA: Basic Information about Arsenic in Drinking Water
Link database: CAMEO Chemicals: Arsenic disulfide