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ARSENIC (As)
GENERAL
PROPERTIES
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Symbol:
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As
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Atomic
Number:
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33
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Atomic
Weight:
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74.9216
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Density:
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5.73
gm/cc
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Melting
Point:
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817
oC (28 Atm)
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Boiling
Point:
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613
oC subl.
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Thermal
Conductivity:
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0.502
W/cm/oK @ 298.2 oK
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Electrical
Resistivity:
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33.3
microhm-cm @ 20 oC
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Electronegativity:
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2.0
Paulings
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Specific
Heat:
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0.0785
Cal/g/oK @ 25 oC
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Heat
of Vaporization:
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7.75
K-cal/gm atom at 2467 oC
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Heat
of Fusion:
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6.62
Cal/gm mole
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MATERIAL
OVERVIEW
Characteristics:
Silver-gray brittle, crystalline solid that darkens in
moist air. Allotropic forms: black, amorphous solid
(beta-arsenic); yellow, crystalline solid. Mohs
hardness 3.5; insoluble in water, caustic and
nonoxidizing acids. Attacked by HCl in presence of
oxidant. Reacts with nitric acid. Low thermal
conductivity; a semiconductor.
Derivation:
Flue dust of copper and lead smelters, from which it
is obtained as white arsenic (arsenic trioxide) in
varying degrees of purity. This is reduced with
charcoal. The commercial grade is not made in the
U.S.
Hazard:
Highly toxic by ingestion and inhalation. A known
carcinogen. OSHA standard for employee exposure is 10 ug/m3
of air. Respirators required for worker exposure to more than 500 ug/m3. ACGIH tolerance is 0.2 mg/m3 (As soluble
compounds).t
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Material
Safety Data Sheet - MSDS
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Arsenic MSDS
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TYPICAL
ANALYSES
Impurities
in ppm
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Material
/ Purity:
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5N
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6N
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Al
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<1.0
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0.1
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Ca
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<1.0
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0.1
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Cu
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<1.0
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<0.1
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Fe
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<1.0
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-
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Pb
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<1.0
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-
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Mg
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<1.0
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-
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Si
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<1.0
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0.1
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S
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<1.0
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<0.1
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POWDER, SHOT, PELLETS, & INGOT
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Material
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Purity
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Arsenic
Pieces 3-12mm,
10 Gram Ampoule
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4N,
5N, 6N
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Arsenic
Pieces 3-12mm,
25 Gram Ampoule
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4N,
5N, 6N
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Arsenic
Pieces 3-12mm,
100 Gram Ampoule
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4N,
5N, 6N
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Arsenic
Powder-40 Mesh
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3N,
4N, 5N
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Powder
and pieces are pre-packaged in glass ampoules under
dry argon.
COMPOUNDS
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Material
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Purity
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Arsenic
Iodide, AsI3,
-80 Mesh
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2N,
5N
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Arsenic
Oxide, As2O3,
-100 Mesh
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5N
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Arsenic
Oxide, As2O5,
1/2" by Down
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3N,
5N
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Arsenic
Oxide, As2O5,
-100 Mesh
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3N
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Arsenic
Selenide, As2Se3,
1/4" Pieces by Down
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2N,
5N
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Arsenic
Selenide, As2Se3,
-325 Mesh
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5N
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Arsenic
Sulfide, As2S3,
-325 Mesh
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3N,
4N
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Arsenic
Sulfide, As2S3,
½” Pieces by Down
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4N
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Arsenic
Telluride, As2Te3,
½” Pieces by Down
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2N,
5N
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Arsenic
Telluride, As2Te3,
-325 Mesh
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2N,
5N
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Compounds
are packaged to order and sold by the gram or
kilogram.
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