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  2. Arsenic - Wikipedia

    en.wikipedia.org/wiki/Arsenic

    In As 4 S 10, arsenic has a formal oxidation state of +2 in As 4 S 4 which features As-As bonds so that the total covalency of As is still 3. [38] Both orpiment and realgar, as well as As 4 S 3, have selenium analogs; the analogous As 2 Te 3 is known as the mineral kalgoorlieite, [39] and the anion As 2 Te − is known as a ligand in cobalt ...

  3. Arsenic compounds - Wikipedia

    en.wikipedia.org/wiki/Arsenic_compounds

    Arsenic forms colorless, odorless, crystalline oxides As 2 O 3 ("white arsenic") and As 2 O 5 which are hygroscopic and readily soluble in water to form acidic solutions. Arsenic(V) acid is a weak acid and the salts are called arsenates , [ 5 ] the most common arsenic contamination of groundwater , and a problem that affects many people.

  4. Arsenic cycle - Wikipedia

    en.wikipedia.org/wiki/Arsenic_cycle

    The arsenic (As) cycle is the biogeochemical cycle of natural and anthropogenic exchanges of arsenic terms through the atmosphere, lithosphere, pedosphere, hydrosphere, and biosphere. Although arsenic is naturally abundant in the Earth's crust, long-term exposure and high concentrations of arsenic can be detrimental to human health. [1] [2]

  5. Medical use of arsenic trioxide - Wikipedia

    en.wikipedia.org/wiki/Medical_use_of_arsenic...

    When administered intravenously, a steady state is reached after 8–10 days. Arsenic binds to proteins to an insignificant extent. The highest concentrations of arsenic are found in the liver, kidneys, heart, lungs, hair, and nails. Arsenous acid is oxidized to arsenic acid and methylated in the liver, [65] [66] [67] and then excreted 60% in ...

  6. Arsenate-reducing bacteria - Wikipedia

    en.wikipedia.org/wiki/Arsenate-reducing_bacteria

    Arsenate is the major arsenic form in oxidizing environments; however, in one study, bacteria from arsenic-contaminated soil at a smelter site was able to reduce As(+5) to As(+3) under anaerobic conditions at arsenic concentration as high as 75 mg/L. [3] Arsenate-respiring bacteria and Archaea have also recently been isolated from a diversity of natural environments, including freshwater ...

  7. Arsenic trioxide - Wikipedia

    en.wikipedia.org/wiki/Arsenic_trioxide

    2 HNO 3 + As 2 O 3 + 2 H 2 O → 2 H 3 AsO 4 + N 2 O 3. In terms of its resistance to oxidation, arsenic trioxide differs from phosphorus trioxide, which readily combusts to phosphorus pentoxide. Reduction gives elemental arsenic or arsine (AsH 3) depending on conditions: [22] As 2 O 3 + 6 Zn + 12 HNO 3 → 2 AsH 3 + 6 Zn(NO 3) 2 + 3 H 2 O ...

  8. Allotropes of arsenic - Wikipedia

    en.wikipedia.org/wiki/Allotropes_of_arsenic

    Upon sublimation at 616 °C, the gas phase arsenic molecules lose this packing arrangement and form small clusters of As 4, As 2, and As, though As 4 is by far the most abundant in this phase. [1] If these vapors are condensed swiftly onto a cold surface (<200 K), solid yellow arsenic (As 4 ) results due to the lack of energy required to form ...

  9. Arsine - Wikipedia

    en.wikipedia.org/wiki/Arsine

    In its standard state arsine is a colorless, denser-than-air gas that is slightly soluble in water (2% at 20 °C) [1] and in many organic solvents as well. [citation needed] Arsine itself is odorless, [5] but it oxidizes in air and this creates a slight garlic or fish-like scent when the compound is present above 0.5 ppm. [6]