Uranyl carbonate
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CO3.png)
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| General | |||||||||
| Surname | Uranyl carbonate | ||||||||
| Ratio formula | (UO 2 ) CO 3 | ||||||||
| Brief description |
greenish-yellow solid |
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| properties | |||||||||
| Molar mass | 330.037 g mol −1 | ||||||||
| Physical state |
firmly |
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| solubility |
not soluble in water |
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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 carbonate , ((UO 2 ) CO 3 ) is the greenish-yellow uranyl salt of carbonic acid .
Occurrence
Uranyl carbonate occurs naturally as the mineral rutherfordin . Furthermore, other carbonate-containing uranyl minerals occur in nature , including for example Albrechtschraufite (Ca 4 Mg (UO 2 ) 2 (CO 3 ) 6 F 2 · 17 H 2 O), andersonite (Na 2 Ca [(UO 2 ) ( CO 3 ) 3 ] (H 2 O) 5 ), astrocyanite (Cu 2 (Ce, Nd, La) 2 UO 2 (CO 3 ) 5 (OH) 2 · 1.5 H 2 O) and Liebigite (Ca 2 UO 2 (CO 3 ) 3 · 11 H 2 O).
presentation
The uranyl carbonates are mainly formed in a basic medium at high CO 2 partial pressures, since there can be no complexation in the acidic range due to the release of carbon dioxide.
Uranyl carbonate can be prepared by heating a mixture of uranium trioxide with carbon dioxide in water at a temperature of 300 ° C.
properties
Anhydrous uranyl carbonate is stable up to 500 ° C. In aqueous solutions, anionic tricarbonate complexes with the [UO 2 (CO 3 ) 3 ] 4− ion form at low hydroxide ion concentrations . In addition to the tricarbonate complex, the dicarbonate complex [UO 2 (CO 3 ) 2 ] 2− was also detected in the solid state and in solution. In addition, the trimeric complex [(UO 2 ) 3 (CO 3 ) 6 ] 6− is also found in solution , whereby the individual species are strongly dependent on the pH value.
Health and environmental hazards
Uranyl carbonate, like all uranium compounds, is radioactive and should therefore be treated with the appropriate care and absorption into the body avoided.
literature
- Ingmar Grenthe, Janusz Drożdżynński, 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 .
Individual evidence
- ↑ G. Meinrath, T. Kimura: Carbonate complexation of the uranyl (VI) ion . In: Journal of Alloys and Compounds . tape 202 , no. 1-2 , December 10, 1993, pp. 89-93 , doi : 10.1016 / 0925-8388 (93) 90523-P .
- ↑ Chinh Nguyen Trung, GM Begun, Donald A. Palmer: Aqueous uranium complexes. 2. Raman spectroscopic study of the complex formation of the dioxouranium (VI) ion with a variety of inorganic and organic ligands . In: Inorganic Chemistry . tape 31 , no. 25 , December 1, 1992, pp. 5280-5287 , doi : 10.1021 / ic00051a021 .
- ↑ Entry on uranium compounds in the GESTIS substance database of the IFA , accessed on February 1, 2016 (JavaScript required)
- ↑ 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.
- ↑ a b c Lester R. Morss, Norman M. Edelstein, Jean Fuger (Eds.): The Chemistry of the Actinide and Transactinide Elements. Springer, Dordrecht 2006, p. 261.
- ↑ Eugene. Staritzky, DT Cromer: Crystallographic Data. 130. Uranyl Carbonate, UO 2 CO 3 . In: Analytical Chemistry . tape 28 , no. 7 , July 1, 1956, p. 1211 , doi : 10.1021 / ac60115a053 .
- ↑ Balaram Sahoo, D. Patnaik: Carbonates of Uranium . In: Nature . tape 185 , no. 4714 , March 5, 1960, p. 683 , doi : 10.1038 / 185683a0 (Letters to Nature, "Letters to the Editor ").
- ↑ WA de Jong, E. Apra, TL Windus, JA Nichols, RJ Harrison, KE Gutowski, DA Dixon: Complexation of the Carbonate, Nitrate, and Acetate Anions with the Uranyl Dication: Density Functional Studies with Relativistic Effective Core Potentials . In: Journal of Physical Chemistry A . tape 109 , no. 50 , December 1, 2005, p. 11568-11577 , doi : 10.1021 / jp0541462 .
