Ammonium aluminium sulfate
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Ammonium aluminium sulfate, also known as ammonium alum is a white crystalline double sulfate usually encountered as the dodecahydrate, formula (NH4)Al(SO4)2·12H2O. It is used in water purification, in vegetable glues, in porcelain cements, in natural deodorants and in tanning, dyeing and in fireproofing textiles.[4] It is also an acidity regulator in its use as a food additive (E523). The dodecahydrate occurs naturally as the rare mineral tschermigite.[1][5]
No human or ecological (for reduced concentrations) toxicity registered.[6]
Uses
The pH of the solution resulting from the topical application of ammonium alum with perspiration is typically in the slightly acid range, from 4 to 5.[7] It is a popular deodorant. A 120 gram stone lasts for at least a year of daily usage – much longer than other deodorants and antiperspirants. It is also hypoallergenic and non-staining.[ref. needed] Potassium alum is also used for this purpose.
References
- ↑ 1.0 1.1 1.2 CRC Handbook of Chemistry and Physics, 62nd ed.; Weast, Robert C., Ed.; CRC Press: Boca Raton, FL, 1981; pp B-75. ISBN 0-8493-0462-8.
- ↑ HSNO Chemical Classification Information Database, <http://www.ermanz.govt.nz/Chemicals/ChemicalDisplay.aspx?SubstanceID=15938> (accessed 23 November 2009), New Zealand Environmental Risk Management Authority.
- ↑ 3.0 3.1 CRC Handbook of Chemistry and Physics, 62nd ed.; Weast, Robert C., Ed.; CRC Press: Boca Raton, FL, 1981; pp B-74. ISBN 0-8493-0462-8.
- ↑ Alum. In The Columbia Encyclopedia, 6th ed.; Columbia University Press: Ithaca, NY, 2004, <http://www.questia.com/library/encyclopedia/alum.jsp>. (accessed 23 November 2009).
- ↑ Tschermigite, <http://webmineral.com/data/Tschermigite.shtml> (accessed 30 November 2009), WebMineral.com. Tschemigite, <http://www.mindat.org/show.php?id=4036> (accessed 30 November 2009), MinDat.org.
- ↑ Ammonium alum. In PAN Pesticide Database; Pesticides Action Network, <http://www.pesticideinfo.org/Detail_Chemical.jsp?Rec_Id=PC33857>. (accessed 23 November 2009).
- ↑ Aluminum Ammonium Sulfate Material Safety Data Sheet; J. T. Baker, March 2009, <http://www.jtbaker.com/msds/englishhtml/a2760.htm>. (accessed 23 November 2009).
External links
- IPCS Environmental Health Criteria 194: Aluminium
- NLM Hazardous Substances Data Bank entry for Aluminum compounds
- FAO/WHO Joint Expert Committee on Food Additives (JECFA) monograph: Aluminium (WHO Food Additives Series 24)
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