ARSENIC TRIOXIDE

PRODUCT IDENTIFICATION
CAS NO. 1327-53-3

ARSENIC TRIOXIDE

EINECS NO. 215-481-4
FORMULA As2O3 (As4O6)
MOL WT. 197.84

H.S. CODE

 2811.29
TOXICITY Oral rat LD50: 14.6 mg/kg
SYNONYMS Arsenic (III) oxide; arsenic sesquioxide
Arsenite; Arsenolite; Arsenous acid; Arsenous acid anhydride; arsenous trioxide; Diarsentrioxid (German); Trióxido de diarsénico (Spanish); Trioxyde de diarsenic (French);
SMILES  

CLASSIFICATION

 

PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE Odorless Transparent crystals, or white powder
MELTING POINT 315C
BOILING POINT 465C
SPECIFIC GRAVITY 3.74
SOLUBILITY IN WATER 3.7 g/l00 ml water @ 20C
pH  
VAPOR DENSITY  

AUTOIGNITION

 

NFPA RATINGS

Health: 3 Flammability: 0 Reactivity: 1

REFRACTIVE INDEX

 

FLASH POINT

 

STABILITY Stable under ordinary conditions

GENERAL DESCRIPTION APPLICATIONS

Timber treatment, wood preservatives, agricultural chemicals, glass, pharmaceuticals and non-ferrous alloys.
SALES SPECIFICATION

APPEARANCE

Odorless white powder
As2O3

99.0% min

Fe

0.05% max

MOISTURE

0.5% max

TRANSPORTATION
PACKING 200kgs in drum
HAZARD CLASS 6.1
UN NO. 1561
OTHER INFORMATION
European Hazard Symbols: T+ N, Risk Phrases: 23/25-45-50/53, Safety Phrases: 45-53-60-61

GENERAL DESCRIPTION OF ARSENIC AND ITS COMPOUNDS
Arsenic is a highly poisonous metallic element in the nitrogen family of group Va in the periodic table. Symbol As; aomic number 33; atomic mass 74.9216; melting point ca 817°C; sublimation point ca 613°C; specific gravity 6.80  or 7.004; 5.73; valence -3, 0, +3, or +5.; electronic config. [Ar]3d104s24p3. It appears in three allotropic forms, yellow, black, and gray. The  stable form is a brittle, steel-gray hexagonal solid that oxidizes rapidly in air, and at high temperatures burns to form a white cloud of arsenic trioxide.  Arsenic and some arsenic compounds sublime when heated and convert to gaseous form. Arsenic is an omnipresent element as arsenic minerals in the various lithosphere or fossil fuels including realgar, orpiment, and arsenopyrite. It is prepared commercially from arsenical pyrites (sulfide ores) by condensation of sublimed gas and by the reduction of white arsenic with carbon.  This element contributes hardness and is used in preparing alloys for hard and corrosion-resistant properties. Arsenic is added to germanium  to form gallium arsenide used in the production of semiconductor devices like integrated circuits and also used in laser and light-emitting diodes (LEDs) to convert electricity directly into light. Arsenic compounds are used as agricultural pesticides (such as copper and lead arsenates), wood preservative, for glass making, in alloys, electronics, in indigo and calico printing, in tanning, in bronzing and pyrotechnics and in the manufacture of  dyestuffs. Though some organic compounds of arsenic were used in medicine such as Salvarsan, used in the treatment of syphilis and yaws, Arsenic preparations  for medical purpose are no longer recommended. Arsenate is salt or ester of arsenic acid having a negative ion of AsO43- , arsenite is a salt or ester of arsenious acid having a negative ion of AsO43- derived from aqueous solutions of As4O6 and arsenide is a negative, trivalent binary arsenic compound such as H3As or GaAs. Many arsenic compounds are strong poisons. Arsenic compounds include:
  • Arsenenic acid (meta-arsenic acid, HAsO3 10102-53-1)
  • Arsenenous acid (HAsO2, 13768-07-5)
  • Arsenic Trichloride (AsCl3, CAS#:7784-34-1): Oily, clear liquid; decomposes in water; used in ceramics, organic chemical syntheses, and in the preparation of pharmaceuticals; light sensitive and moisture sensitive.
  • Arsenic Trisulfide (As2S3, CAS#:1303-33-9): An acidic compound in the form of yellow or red monoclinic crystals with a melting point at 300°C; occurs as the mineral orpiment; used as a pigment.
  • Arsenic Acid (H3AsO4, CAS#: 1327-52-2, 7778-39-4): White, poisonous crystals, soluble in water and alcohol; used in wood treatment, finishing agent for glass and metal, manufacturing of dyestuffs and organic arsenic compounds, soil sterilant. Also known ortho-arsenic acid.
  • Arsenic acid monoammonium salt (AsH6NO4,CAS#: 13462-93-6)
  • Arsenic Disulfide (As2S2, CAS#:1303-32-8): Deep red, lusturous monoclinic crystal ;insoluble in water; used in fireworks; naturally occurs as realgar.
  • Arsenic Pentasulfide (As2S5): Yellow crystals; insoluble in water; readily decompose to the trisulfide and sulfur; used as a pigment.
  • Arsenic Pentoxide: (As2O5, CAS#:1303-28-2 ): white, deliquescent compound that decomposes by heat and is soluble in water. same application with arsenic trioxide.
  • Arsenic Trioxide (As2O3, CAS#:1327-53-3): toxic glassy, amorphous lumps or crystal compound; slightly soluble in water; octahedral crystals change to the monoclinic form by heating at 200°C; arsenious acid; occurs naturally as arsenolite and claudetite; used in some medicinal preparations but in small quantities. It is produced as a by-product of metal smelting operations. It has been estimated that 70% of the world arsenic production is used in timber treatment as copper chrome arsenate, 20% in agricultural chemicals as arsenic-containing pesticides, and the remainder in glass, pharmaceuticals and non-ferrous alloys.
  • Arsenin: A heterocyclic organic compound composed of arsenic in six-membered ring structure in which the carbon atoms are unsaturated, with no nitrogen atoms present.
  • Arseniosiderite (Ca3Fe4(AsO4)4(OH)4· 4H2O): A yellowish-brown mineral consisting of a basic iron calcium arsenate and occurring as concretions.
  • Arseno Compound: a compound containing an As-As bond with the general formula (RAs)n, where R represents a functional group; structures are cyclic or long-chain polymers.
  • Arsenobismite (Bi2(AsO4)(OH)3): A yellowish-green mineral consisting of a basic bismuth arsenate and occurring in aggregates.
  • Arsenoclasite (Mn5(AsO4)2(OH)4): A red mineral consisting of a basic manganese arsenate. Also spelled arsenoklasite.
  • Arsenolamprite (FeAsS): A lead gray mineral consisting of nearly pure arsenic; occurs in masses with a fibrous foliated structure.
  • Arsenolite (As2O3): A mineral crystallizing in the isometric system and usually occurring as a white bloom or crust. Also known as arsenic bloom.
  • Arsenopyrite (FeAsS): A white to steel-gray mineral crystallizing in the monoclinic system with pseudo-orthorhombic symmetry because of twinning; occurs in crystalline rock and is the principal ore of arsenic. Also known as mispickel.
  • Arsine (H3As): A colorless, highly poisonous gas with an unpleasant odor.
  • Arsinic Acid ( R2AsO2H): derived from trivalent arsenic; an example is cacodylic acid, or dimethylarsinic acid, (CH3)2AsO2H.
  • Arsanilic acid (98-50-0): 4-Aminophenylarsonic Acid derived from orthoarsenic acid, is an arsenical antibacterial veterinary medicine used in the prevention and the treatment of swine dysentery.
  • Arsonic Acid: An acid derived from orthoarsenic acid, OAs(OH)3; the type formula is generally considered to be RAsO(OH)2; an example is para-aminobenzenearsonic acid, NH2C6H4AsO(OH)2.
  • Arsonium (AsH4): A radical which may be considered analogous to the ammonium radical in that a compound such as AsH4OH may form.
  • Arsphenamine (139-93-5)
  • Calcium Arsenate (Ca3(AsO4)2, CAS #: 7778-44-1)
  • Carbarsone (121-59-5)
  • Copper Arsenate (As2Cu3O8, CAS#: 10103-61-4)
  • Cupric Arsenide (CuHAsO3, CAS #: 10290-12-7)
  • Dimethylarsine ((CH3)2AsH, 593-57-7)
  • Gallium Arsenide (AsGa, CAS #: 1303-00-0)
  • Lead  Arsenate (PbHAsO4, CAS #: 7784-40-9)
  • Magnesium arsenate (As2Mg3O8, CAS #: 10103-50-1)
  • Manganese arsenate (AsHMnO4, CAS #: 7784-38-5)
  • Methylarsine (CH3AsH2, 593-52-2)
  • 3-Nitro-4-hydroxy-phenyl arsonic acid (121-19-7) : Also called Roxarsone; used in veterinary medicine to promote growth, feed efficiency and pigmentation and to control swine dysentery. . It is used as a synergist of primary anticoccidials.
  • 4-Nitrophenylarsonic acid (98-72-6)
  • Potassium Arsenate (KH2AsO4, CAS #: 7784-41-0)
  • Potassium Arsenite (KH(AsO2)2, CAS #: 10124-50-2)
  • Sodium Arsenate (Na3AsO4, CAS #: 7631-89-2, 7778-43-0(Dibasic), 13464-38-5(tribasic))
  • Sodium Arsenite  (NaAsO2, CAS #: 7784-46-5)
  • Trimethylarsine ((CH3)3As, 593-88-4)
  • Tryparsamide (554-72-3)
  • Zinc Arsenate (As2O8Zn3, CAS#:13464-44-3)