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It is rapidly transformed into grey arsenic by light. The yellow form has a density of 1.97 g/cm 3. [23] Black arsenic is similar in structure to black phosphorus. [23] Black arsenic can also be formed by cooling vapor at around 100–220 °C and by crystallization of amorphous arsenic in the presence of mercury vapors. [26] It is glassy and ...
Pearceite is one of the four so-called "ruby silvers", pearceite Cu(Ag,Cu) 6 Ag 9 As 2 S 11, pyrargyrite Ag 3 SbS 3, proustite Ag 3 AsS 3 and miargyrite AgSbS 2. [6] It was discovered in 1896 and named after Dr Richard Pearce (1837–1927), a Cornish–American chemist and metallurgist from Denver , Colorado.
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.
A faulty calibration gave a wavelength of 531.68 nm, which was eventually corrected to 530.3 nm, which Grotrian and Edlén identified as originating from Fe XIV in 1939. [ 9 ] [ 10 ] The lightest of the Group 0 gases, the first in the periodic table, was assigned a theoretical atomic mass between 5.3 × 10 −11 u and 9.6 × 10 −7 u .
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 ...
The reaction of the copper complex [L 2 Cu(NCMe)] (L 2 = [{N(C 6 H 3 iPr 2-2,6)C(Me)} 2 CH]) with yellow arsenic yields the As 4-bridged dimer [{L 2 Cu} 2 - (μ,η 2:2-As 4)]. [22] The four-atom arsenic moiety in this complex was deemed to be "intact" yellow arsenic through the use of density functional theory calculations determining the ...
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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 ...