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Arsenic Structure

Arsenic

Chemical Properties

Melting point 817 °C(lit.)
Boiling point 613 °C(lit.)
Density  5.727 g/mL at 25 °C(lit.)
vapor pressure  1Pa at 280℃
solubility  insoluble in H2O
form  powder
color  Silver to black
Specific Gravity 5.727
Odor Odourless
Resistivity 33.3 μΩ-cm
Water Solubility  insoluble
Sensitive  Air Sensitive
Merck  13,802
Exposure limits TLV-TWA 0.2 mg(As)/m3 (ACGIH), 0.5 mg (As)/m3 (MSHA), 0.01 mg(As)m3 (OSHA); ceiling 0.002 mg(As)/m3/15 min (NIOSH); carcinogenicity: Human Sufficient Evidence (IARC).
Stability Stable. Incompatible with acids, oxidizing agents, halogens. Heat and air-sensitive.
CAS DataBase Reference 7440-38-2(CAS DataBase Reference)
IARC 1 (Vol. 23, Sup 7, 100C) 2012
NIST Chemistry Reference Arsenic(7440-38-2)
EPA Substance Registry System Arsenic (7440-38-2)

Safety Information

Hazard Codes  T,N
Risk Statements  23/25-50/53-36/38-22-45-52/53-51/53
Safety Statements  20/21-28-45-60-61-26-53
RIDADR  UN 1558 6.1/PG 2
OEL Ceiling: 0.002 mg/m3 [15-minute]
WGK Germany  3
RTECS  CG0525000
10
TSCA  Yes
HazardClass  6.1
PackingGroup  II
HS Code  28048000
Hazardous Substances Data 7440-38-2(Hazardous Substances Data)
Toxicity Human exposure occurs occupationally and via food, tobacco smoke, ambient air, and water. Three major groups of arsenic compounds have been defined on the basis of biological considerations: inorganic arsenicals; organic arsenicals; and arsine (gas). The comparative toxicity of these groups is dependent upon the route of exposure and their solubilities; the more quickly absorbed compounds have lower LD50. Arsenic is readily absorbed by the respiratory and gastrointestinal systems and is concentrated in the skin, hair, and nails (Aldrich-Mees’ lines). The cellular toxicity of arsenic is related to reactions with SH-containing mitochondrial enzymes that result in impaired respiration. Arsenic may also compete with phosphate during oxidative phosphorylation.
IDLA 5 mg As/m3

MSDS

Usage And Synthesis

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