Uranyl Acetate Nitrate

URANIUM HEXAFLUORIDE URANYL ACETATE URANYL NITRATE URANYL NITRATE HEXAHYDRATE... 

There are a Tew compounds of alkalies, nitrate, and acetate thai have low solubilities, but most of them are quite complex in composition. For example, sodium uranyl acetate, NaUQifCHjCOOh has low solubility. Silver acetate is an exception but its solubility is moderate. 

Note Uranyl nitrate can be used instead of uranyl acetate [1]. The detection limits for purines are 10 ng substance per chromatogram zone. 

Compound Name Chloroform Uranyl Acetate Uranyl Nitrate Uranyl Sulfate Uranyl Sulfate Urea... 

Uranyl Acetate. U02(C2 0. 21 0 mw 422.19 yel rhomb crysts mp 110° (-2H20) bp 275° (decompn) d 2.893g/cc at 15°. V sol in ethanol sol in w. Prepn is by reacting Na acetate with U nitrate. The acetate has been suggested by DeMent (Ref 2) for use in a pyrot radioactive smoke formulation. The compn consists of U acetate 3, Na chlorate 8, S 4 and amm acid fluoride 4.5p, which upon ignition bums in a flameless reaction generating a grey smoke... 

TJranyl Dihyirogen Orthoarsenate, U02(H2As04)2.3H20, separates in small yellow crystals when a solution of uranyl acetate or nitrate containing an excess of arsenic acid is concentrated.6 The crystals lose their water of crystallisation at 150° C. 

In its precipitation reactions ameiicium(IIl) is very similar to the other tripositive actinide elements and to the rare earth elements. Thus the fluonde and the oxalate are insoluble and the phosphate and iodate are only moderately soluble in acid solution, whereas the nitrates, halides, sulfates, sulfides, and perchlorates are all soluble. Americium(VI) can be precipitated with sodium acetate giving crystals isostructural with sodium uranyl acetate,... 

Longchambon, H. C. R. Hebd. Seances. Acad. Sci. Paris. 1923, 176. 691-693. Chandra, B. P. Indian J. Phvs. 1987, 61A, 51-59. The two spectra labelled uranyl nitrate were labelled uranyl acetate in a previous paper (Chandra, B. P. phvs. stat. sol, (a) 1981, 64. 395-405.) we believe, as Chandra obviously did, that the results would be similar. 

Table 2. Electronic origins (all in cm-1) at very low temperatures in crystalline caesium and rubidium uranyl chloride, caesium uranyl nitrate and sodium uranyl acetate. The quantum number Q characterizing many-electron states in linear chromophores (subject to perceptible relativistic effects) may correspond to two energy levels because of the 4 or 6 ligating atoms in the equatorial plane...

Reactions of uranyl ions UO + To study these reactions use a 0- 1m solution of uranyl nitrate, U02(N03)2.6HzO or of uranyl acetate, U02(CH3C00)2.2H20. 

Fluorescence Uranium salts, when irradiated by ultraviolet rays (e.g. with a u.v. lamp used for paper chromatography) exhibit a characteristic green fluorescence. The phenomenon is especially surprising if in a dark room a bottle containing solid uranyl nitrate or uranyl acetate is irradiated. 

Chemically induced renal failure caused 100% mortality in male Wistar rats after 5 daily exposures to 237 or 1,928 mg U/kg/day as uranyl nitrate hexahydrate or ammonium uranyl tricarbonate, respectively, applied in a water-Vaseline emulsion (De Rey et al. 1983). A 60% mortality rate was also reported for other male Wistar rats that received daily applications of 1,965 mg U/kg as uranyl acetate dihydrate for 1-11 days. No deaths were reported for other Wistar rats similarly treated with 2,103 mg U/kg/day as ammonium diuranate or to an unspecified dose of uranium dioxide (De Rey et al. 1983). 

Electron microscopy and X-ray microanalytical methods showed that uranium as uranyl nitrate hexahydrate penetrated the stratum corneum within 15 minutes and accumulated in the intracellular space between the viable epidermis and the stratum corneum (De Rey et al. 1983). As is the case with inhalation and oral absorption, water solubility is an important determinant of absorption, and no penetration was observed with the insoluble compounds uranium dioxide, uranyl acetate, or ammonium diuranate. After 48 hours, uranium applied as uranyl nitrate was no longer found in the skin and toxicity developed, indicating that the uranium had been absorbed into the blood. 

Property Uranium hexafluoride Uranium tetrachloride UranyF fluoride Uranyl acetate, dihvdrate Uranyl nitrate hexahvdrate... 

In a much earlier patent, the removal of organics from exhaust gases by oxidation over a supported uranium oxide catalyst was reported by Hofer and Anderson [39]. The catalyst was 4% U3O8 supported on alumina spheres. The authors used the incipient wetness technique to impregnate alumina with uranyl nitrate solution. In this case the catalyst precursors were calcined at 700°C for 3 h to decompose the uranium salt. The use of other uranium compounds as starting materials was mentioned and these included uranyl acetate, uranium ammonium carbonate and uranyl chloride. The alumina-supported catalyst had a surface area of ca 400m g and further added components, such as copper, chromium and iron, were highlighted as efficient additives to increase activity. 

Barium Diuranate, BaUjO, is obtained by heating barium uranyl acetate, or by heating together the green oxide and barium chlorate. It is obtained in a hydrated condition when ammonia is added to mixed solutions of barium chloride and uranyl nitrate, or when excess of baryta water is added to uranyl nitrate solution. It is a deep yellow crystalline powder. 

Zinc Uranate, ZnU04, is deposited, according to Wertheim, on a sheet of zinc placed in a solution of uranyl nitrate or it may be precipitated from a solution of zinc uranyl acetate by the addition of baryta water. It is an amorphous yellow powder, insoluble in w ater. 

The triacetate uranyl complex (24) is structurally similar to the trinitrate uranyl complex (6) (three bidentate ligands arranged equa-torially around the uranyl O—U—O axis). It was expected that the visible, near ultraviolet spectrum of the triacetate uranyl complex would be similar to the spectrum of U02(N03)3 as are the spectra of 1102(804)3, 1102(003)3 , and other uranyl complexes which apparently have the same structure (17). The absorption spectrum of uranyl acetate extracted into tri-n-octylamine in xylene from dilute acetic acid is different from the trinitrato uranyl spectrum. This indicates that the triacetate uranyl complex is probably not the species involved. By analogy to the uranyl nitrate system 14), formation of a tetraacetate uranyl complex might be expected. The purpose of this work is to determine the nature of the anionic hexavalent actinide acetate complexes and to identify the species involved in the amine extraction and anion exchange of the hexavalent actinides from acetate systems. 

The catalyst was prepared by 72-hour treatment of 100 gm of Linde sodium sieve with 1700 ml of 22.1 wt % ammonium nitrate. During this period the slurry was occasionally stirred. The slurry was filtered, and after working the solid several times with water, it was dried at room temperature. The amount of sodium ion replaced by ammonium ion was determined by analyzing the filtrate for sodium using the magnesium uranyl acetate reagent. The extent of replacement was found to be 52% and this compared favorably with the results of Turkevich and Ciborowski (3), who found, using the same method of preparation but a different method of analysis, a 56% replacement. 

Uranyl acetate, UOtCCbHiOi) 2 H2O, is next to the nitrate the most important uranyl salt of commerce. It is prepared by the solution of uranyl hydroxide or oxide in acetic acid. It is soluble in water, forming a solution with a density of 2.89 from which it crystallizes in fluorescent prisms. It displays the phenomenon of photalysis. 

Uranyl(III) salts such as U02(0Ac)2 or U02(N03)2 have been used as photochemical agents for DNA cleavage and for probing of protein-DNA contacts (198-199). Single-strand DNA breaks are induced by uranyl acetate or uranyl nitrate under irradiation in the 420-nm region. The binding constant of the UO2 dication is estimated to be of... 

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