Arsenic trioxide
| Arsenic trioxide | |
|---|---|
| Identifiers | |
| InChI | InChI=1/As4O6/c5-1-6-3-8-2(5)9-4(7-1)10-3 |
| InChIKey | KTTMEOWBIWLMSE-UHFFFAOYAT |
| Standard InChI | InChI=1S/As4O6/c5-1-6-3-8-2(5)9-4(7-1)10-3 |
| Standard InChIKey | KTTMEOWBIWLMSE-UHFFFAOYSA-N |
| CAS number | [] |
| EC number | |
| ChemSpider | |
| Properties[1] | |
| Chemical formula | As2O3 |
| Molar mass | 197.84 g mol−1 |
| Appearance | white powder |
| Melting point |
312.3 °C |
| Boiling point |
457.2 °C |
| Solubility in water | 3.7 g/100 ml (20 °C) |
| Structure (cubic)[2] | |
| Space group | Fd3m (No. 227) |
| Lattice constant | a = 1104.57 pm |
| Structure (monoclinic)[3] | |
| Space group | P21/n (No. 11) |
| Lattice constant | a = 533.9 pm, b = 1298.4 pm, c = 454.05 pm, α = 90°, β = 94.26°, γ = 90° |
| Thermochemistry (As4O6)[4] | |
| Std enthalpy of formation ΔfH |
−1312.7 kJ mol−1 |
| Standard molar entropy S |
214 J K−1 mol−1 |
| Hazards[5][6] | |
| EU index number | 033-003-00-0 |
| GHS pictograms |    
|
| GHS signal word | DANGER |
| GHS hazard statements | H300, H314, H350, H400, H411 |
| PEL (U.S.) | 0.01 mg m−3 TWA (as As) |
| Related compounds | |
| Other anions | Arsenic trisulfide Arsenic triselenide |
| Other cations | Phosphorus trioxide Antimony trioxide Bismuth trioxide |
| Other compounds | Arsenic pentaoxide |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
Arsenic trioxide, As2O3, is the major commercial compound of arsenic, and the normal product when arsenic is burned in air.[7]
References
- ↑ CRC Handbook of Chemistry and Physics, 62nd ed.; Weast, Robert C., Ed.; CRC Press: Boca Raton, FL, 1981; p B-79. ISBN 0-8493-0462-8.
- ↑ Bozorth, Richard M. The crystal structures of the cubic forms of arsenious and antimonous oxides. J. Am. Chem. Soc. 1923, 45 (7), 1621–27. DOI: 10.1021/ja01660a006.
- ↑ Frueh, Alfred J., Jr. The crystal structure of claudetite (monoclinic As2O3). Am. Mineral. 1951, 36 (11–12), 833–50, <http://www.minsocam.org/ammin/AM36/AM36_833.pdf>.
- ↑ Jolly, William L. Modern Inorganic Chemistry, 2nd ed.; McGraw-Hill: New York, 1991; p 582. ISBN 0-07-032768-8.
- ↑ Index no. 033-003-00-0 of Annex VI, Part 3, to Regulation (EC) No 1272/2008 of the European Parliament and of the Council of 16 December 2008 on classification, labelling and packaging of substances and mixtures, amending and repealing Directives 67/548/EEC and 1999/45/EC, and amending Regulation (EC) No 1907/2006. OJEU L353, 31.12.2008, pp 1–1355 at p 427.
- ↑ "Inorganic arsenic", 29 C.F.R. § 1910.1018, 58 FR 35310, June 30, 1993, as amended. Arsenic (inorganic compounds, as As). In Pocket Guide to Chemical Hazards; U.S. Department of Health and Human Services (NIOSH) Publication No. 2005-149; Government Printing Office: Washington, DC, 2005. ISBN 9780160727511, <http://www.cdc.gov/niosh/npg/npgd0038.html>.
- ↑ Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984; pp 668–70. ISBN 0-08-022057-6.
Further reading
- Arsenic and arsenic compounds. In Overall Evaluations of Carcinogenicity: An Updating of IARC Monographs Volumes 1 to 42; IARC Monographs on the Evaluation of Carcinogenic Risks to Humans Supplement 7; International Agency for Research on Cancer: Lyon, France, 1987; pp 100–6. ISBN 92-832-1411-0, <http://monographs.iarc.fr/ENG/Monographs/suppl7/Suppl7-19.pdf>. Arsenic in Drinking Water. In Some Drinking-water Disinfectants and Contaminants, including Arsenic; IARC Monographs on the Evaluation of Carcinogenic Risks to Humans 84; International Agency for Research on Cancer: Lyon, France, 2004; pp 39–267. ISBN 92-832-1284-3, <http://monographs.iarc.fr/ENG/Monographs/vol84/mono84-6.pdf>.
- Arsenic Compounds, Inorganic. In Report on Carcinogens, Eleventh Edition; U.S. Department of Health and Human Services, Public Health Service, National Toxicology Program, 2005, <http://ntp.niehs.nih.gov/ntp/roc/eleventh/profiles/s015arse.pdf>.
External links
 |
See also the corresponding article on Wikipedia. |
- IPCS Environmental Health Criteria 182: Arsenic
- IPCS Poisons Information Monograph G042: Arsenic
- WHO Food Additives Series 24
- JECFA Evaluation: Arsenic
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