Uranyl acetate
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| General | ||||||||||
| Surname | Uranyl acetate | |||||||||
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| Molecular formula | C 4 H 6 O 6 U | |||||||||
| Brief description |
yellow rhombic prisms (dihydrate) |
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| properties | ||||||||||
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| Physical state |
firmly |
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| density |
2.89 g cm −3 |
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| Melting point |
110 ° C (loss of crystal water) |
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| boiling point |
275 ° C (thermal decomposition) |
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| solubility |
moderate in water (76.94 g l −1 ) |
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| Hazard and safety information | ||||||||||
 Radioactive |
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | ||||||||||
Uranyl acetate (UO 2 (CH 3 COO) 2 · 2 H 2 O) is a yellow, crystalline solid consisting of rhombic crystals with a slightly acetic odor. At temperatures above 110 ° C the water of crystallization is lost ; if the substance is heated above 275 ° C, it thermally decomposes to uranium trioxide (UO 3 ).
presentation
Uranyl acetate is obtained from uranium trioxide by reaction with 30% acetic acid :
use
Uranyl acetate is used for negative contrasting in electron microscopes . In fact, it is necessary for most processes in electron microscopy in biology. Uranyl acetate solutions are sensitive to light and decompose primarily under UV radiation . One and two percent uranyl acetate solutions are used as indicators and for titration in higher concentrations in analytical chemistry . In the presence of magnesium acetate, uranyl acetate forms crystals of sodium magnesium uranyl acetate , which, in contrast to other sodium salts, is relatively sparingly soluble and can be identified microscopically based on its crystal form.
safety instructions
Commercial uranyl acetate preparations are made from depleted uranium and have (free of hydration water) a radioactivity of 13.69 to 18.87 kBq / g (0.37 to 0.51 µ Ci / g.) This low radiation intensity is too weak to be dangerous as long as the material is not incorporated .
Uranium compounds are highly toxic regardless of their radioactivity. After ingestion (orally, as dust via the respiratory tract or in contact with wounds), it is very toxic to the human body. Risks for the entire organism from long-term exposure cannot be ruled out. This is how genetic damage and cancer can develop.
Individual evidence
- ↑ a b c d e f Entry on uranyl acetate in the GESTIS substance database of the IFA , accessed on July 23, 2016(JavaScript required) .
- ↑ a b Data sheet Uranyl Acetate ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. (PDF; 172 kB) from Ladd Research, accessed March 16, 2014.
- ↑ Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the specified labeling it falls under the group entry uranium compounds with the exception of those specified elsewhere in this Annex in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA) , accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .
- ↑ The hazards emanating from radioactivity do not belong to the properties to be classified according to the GHS labeling.
- ↑ Hagers Handbuch der Pharmaceutischen Praxis , Volume 2, Berlin 1910, p. 1069.
- ↑ http://www.chemischemlexikon.de : Uranyl acetate .
- ↑ Abou-Donia MB, Dechkovskaia AM, Goldstein LB, Shah DU, Bullman SL, Khan WA: Uranyl acetate-induced sensorimotor deficit and increased nitric oxide generation in the central nervous system in rats. , Pharmacol Biochem Behav. 2002 Jul; 72 (4): 881-90. PMID 12062578
literature
- Ingmar Grenthe, Janusz Drożdżyński, Takeo Fujino, Edgar C. Buck, Thomas E. Albrecht-Schmitt, Stephen F. Wolf: Uranium , in: Lester R. Morss, Norman M. Edelstein, Jean Fuger (eds.): The Chemistry of the Actinide and Transactinide Elements , Springer, Dordrecht 2006; ISBN 1-4020-3555-1 , pp. 253-698; doi : 10.1007 / 1-4020-3598-5_5 .
