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| Names | |
|---|---|
| IUPAC name Uranium bis(acetato)-O)dioxo-dihydrate | |
| Other names Uranyl ethanoate | |
| Identifiers | |
| CAS Number | |
| ECHA InfoCard | 100.007.971 
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| CompTox Dashboard (EPA) | |
| Properties | |
| Chemical formula | UO2(CH3COO)2 (anhydrous) UO2(CH3COO)2·2H2O (dihydrate) |
| Molar mass | 424.146 g/mol (dihydrate) |
| Appearance | yellow crystals (dihydrate) |
| Density | 2.89 g/cm (dihydrate) |
| Melting point | decomposes at 80°C (dihydrate) |
| Solubility | slightly soluble in ethanol |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa).
 Y verify (what is ?)
Infobox references
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Uranyl acetate (UO2(CH3COO)2·2H2O) is a slightly radioactive, yellow free-flowing crystalline solid of yellow rhombic crystals with a slight acetic odor. This reagent is a nuclear fuel derivative, and thus its use and possession are sanctioned by international law.
It is used as a negative stain in electron microscopy. In fact, most procedures in electron microscopy for biology require the use of uranyl acetate. In the negative staining method 1% or 2% aqueous solution is normally used. One of the advantages of this type of staining is its simplicity. One can examine the sample within a few minutes after staining. Some biological samples may be adversely affected by uranyl acetate staining and, in these cases, a low-voltage electron microscopy technique may be more suitable due to the improved resolution of low atomic number materials.
1% and 2% uranyl acetate solutions are used as an indicator, and a titrant in stronger concentrations in analytical chemistry, as it forms an insoluble salt with sodium (the vast majority of sodium salts are water-soluble). Uranyl acetate solutions show evidence of being sensitive to light, especially UV and will precipitate if exposed.
Uranyl acetate is also used in a standard test—American Association of State Highway and Transportation Officials (AASHTO) Designation T 299—for alkali-silica reactivity in aggregates (crushed stone or gravel) being considered for use in cement concrete.
Commercial preparations of uranyl acetate are made from depleted uranium and have a typical radioactivity of 0.37 - 0.51 µCi/g. This mild radioactivity level is not sufficient to be harmful while the material remains external to the body. However it is very toxic by ingestion and if inhaled as dust or by skin contact if skin is cut or abraded and there is a danger of cumulative effects from long term exposure.
References
- Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, FL: CRC Press, pp. 3–566, ISBN 0-8493-0594-2
External links
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| Uranium compounds | |||
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| U(II) | |||
| U(III) |
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| U(IV) |
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| U(IV,V) | |||
| U(IV,VI) | |||
| U(V) | |||
| U(VI) | |||
| U(XII) |
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