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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 its salts, known as arsenates , [ 36 ] are a major source of arsenic contamination of groundwater in regions with high levels of naturally ...
Arsenic trioxide powder.. Compounds of arsenic resemble in some respects those of phosphorus which occupies the same group (column) of the periodic table.The most common oxidation states for arsenic are: −3 in the arsenides, which are alloy-like intermetallic compounds, +3 in the arsenites, and +5 in the arsenates and most organoarsenic compounds.
[8] [9] Cp PEt = C 5 (4-EtC 6 H 4) 5), Cp * =(η 1-Me 5 C 5) Other reactions of main group compounds with yellow arsenic have been shown to involve units of arsenic with more than four atoms. In reaction with the silylene compound [PhC(N t Bu) 2 SiN(SiMe 3 ) 2 ], an aggregation of As 4 was observed to form a cage compound of ten arsenic atoms ...
The European Commission (2000) reports that levels of arsenic in air range 0–1 ng/m 3 in remote areas, 0.2–1.5 ng/m 3 in rural areas, 0.5–3 ng/m 3 in urban areas, and up to about 50 ng/m 3 in the vicinity of industrial sites. Based on these data, the European Commission (2000) estimated that in relation to food, cigarette smoking, water ...
In all of these the geometry around the As III centers are approximately trigonal, the lone pair on the arsenic atom is stereochemically active. [1] Well known examples of arsenites include sodium meta-arsenite which contains a polymeric linear anion, (AsO − 2) n, and silver ortho-arsenite, Ag 3 AsO 3, which contains the trigonal AsO 3− 3 ...
Arsenic (III) enters the cells though aquaporins 7 and 9, which is a type of aquaglyceroporin. [26] Arsenic (V) compounds use phosphate transporters to enter cells. [26] The arsenic (V) can be converted to arsenic (III) by the enzyme purine nucleoside phosphorylase. [26]
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 ...
Arsenic (33 As) has 32 known isotopes and at least 10 isomers. Only one of these isotopes, 75 As, is stable; ... 5+ 66m2 As 3023.(3) keV 7.98(26) μs IT 66 As 9+
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