ARSENIC PENTOXIDE

ARSENIC PENTOXIDE
PRODUCT IDENTIFICATION
CAS NO.	1303-28-2
EINECS NO.	215-116-9
FORMULA	As₄O₁₀(As₂O₅)
MOL WT.	459.68
H.S. CODE	2811.29
TOXICITY	Oral rat LD50: 8mg/kg
SYNONYMS	Arsenic Anhydride; Arsenic (V) Oxide;
arsenic acid anhydride; Diarsenic Pentoxide; Fotox; Diarsenpentaoxid (German); Pentaoxido de diarsénico (Spanish); Pentaoxyde de diarsenic (French);
DERIVATION
CLASSIFICATION
PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE	white powder
MELTING POINT	315 C (Decomposes)
BOILING POINT
SPECIFIC GRAVITY
SOLUBILITY IN WATER	150g/100ml
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	white powder
As₂O₅	99.0% min
Fe	0.03% max
MOISTURE	0.3% max
TRANSPORTATION
PACKING	25kgs in Bag
HAZARD CLASS	6.1 (Packing Group: II)
UN NO.	1557
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 AsO₄^3- , arsenite is a salt or ester of arsenious acid having a negative ion of AsO₄^3- 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)