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:

Directory of scientists: Zdenka Šlejkovec
Link database: CBI: Spain legislation: Wood preserved with arsenic and chromium
Material database: National Institute of Standards and Technology (NIST) - SRM 2677a
Call for help: ISO/DIN Project: Standard method for arsenic speciation analysis using HPLC-ICP-MS | EVISA's News
Material database: National Institute of Standards and Technology (NIST) - SRM 2134 - Arsenic in Silicon
Material database: The Food and Environment Research Agency (FAPAS) - Test Material T07128 (Canned Fish)
Material database: Sigma-Aldrich - Matrix CRM - Soil, Sludge, Sediment: Trace Metals - Chalky Loam 1
Sample preservation for speciation analysis - General recommendations | EVISA's News
Link database: GreenFacts: Scientific Facts on Arsenic
Directory of scientists: Kevin Kubachka
Directory of scientists: Dulasiri Amarasiriwardena
Instrument database: Austin AI, LLC - CP-1000 EDXRF system
Link database: CBI: Portugal legislation: Wood preserved with arsenic and chromium
Council Decision 75/437/EEC on Marine Pollution from Land-based Sources | EVISA's News
Material database: Sigma-Aldrich - Matrix CRM - Soil, Sludge, Sediment: Trace Metals - Sandy Loam 7
High Levels of Arsenic in American Wines | EVISA's News
Link database: US FDA: Questions & Answers: Apple Juice and Arsenic
Material database: National Institute of Standards and Technology (NIST) - SRM 695 - Trace Elements in Multi-Nutrient Fertilizer
Chemical speciation analysis for the life sciences | EVISA's News
Link database: Chemical Fact Sheet: Uranium