Arsenic trioxide

Arsenic trioxide
Identifiers
CAS Number	1327-53-3;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:30621;
ChemSpider	452454;
DrugBank	DB01169;
ECHA InfoCard	100.014.075
Gmelin Reference	35185
KEGG	D02106;
PubChem CID	518605;
CompTox Dashboard (EPA)	DTXSID0020103 ;
	InChI InChI=1S/As4O6/c5-1-6-3-8-2(5)9-4(7-1)10-3 Key: KTTMEOWBIWLMSE-UHFFFAOYSA-N;
	SMILES O1[As]2O[As]3O[As]1O[As](O2)O3;
Properties
Chemical formula	As4O6
Molar mass	395.680 g·mol−1
Appearance	white solid
Density	3.74 g/cm3
Melting point	312.2 °C (594.0 °F; 585.3 K)
Boiling point	465 °C (869 °F; 738 K)
Solubility in water	20 g/L (25 °C (77 °F; 298 K))
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H300, H314, H350, H410
Precautionary statements	P201, P202, P260, P264, P270, P273, P280, P301+P330+P331, P303+P361+P353, P304+P340+P310, P305+P351+P338+P310, P308+P313, P363, P391, P405, P501
Threshold limit value (TLV)	0.05 mg/m3 (TWA)
	NIOSH (US health exposure limits):
PEL (Permissible)	0.010 mg/m3 (TWA, as As)
REL (Recommended)	0.002 mg/m3 (15 minute, as As)
IDLH (Immediate danger)	5 mg/m3 (as As)
Safety data sheet (SDS)	Safety Data Sheet
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Arsenic trioxide is the inorganic compound with the formula As₄O₆. As an industrial chemical, its major uses include the manufacture of wood preservatives, pesticides, and glass. For medical purposes, it is sold under the brand name Trisenox among others when used as a medication to treat a type of cancer known as acute promyelocytic leukemia. For this use it is given by injection into a vein.

Arsenic trioxide was approved for medical use in the United States in 2000. It is on the World Health Organization's List of Essential Medicines. Approximately 50,000 tonnes were produced in 1991. Due to its toxicity, a number of countries have regulations around its manufacture and sale.