Uranyl acetate

The larger cations of Group 1 (K, Rb, Cs) can be precipitated from aqueous solution as white solids by addition of the reagent sodium tetraphenylborate, NaB(C( H5)4. Sodium can be precipitated as the yellow sodium zinc uranium oxide ethanoate (sodium zinc uranyl acetate). NaZn(U02)3(CH3C00)y. 9H2O. by adding a clear solution of zinc uranyl acetate in dilute ethanoic acid to a solution of a sodium salt. 

Uranium Dissolve 2.1095 g U02(N03)2 6H2O (or 1.7734 g uranyl acetate dihydrate) in water... 

The alkah metals are commonly separated from all other elements except chlorine before gravimetric determination. In the absence of other alkaUes, sodium maybe weighed as the chloride or converted to the sulfate and weighed. WeU-known gravimetric procedures employ precipitation as the uranyl acetate of sodium—2inc or sodium—magnesium. Quantitative determination of sodium without separation is frequently possible by emission or atomic-absorption spectrometric techniques. 

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

Such indicators do not migrate during chromatography to the solvent front under the influence of either polar or nonpolar organic solvents (uranyl acetate is an exception). 

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. 

Sodium hypochlorite, 360 Sodium myristate, 426 Sodium stearate, 426 Sodium uranyl acetate, 17.)... 

Solution A dissolve 20g crystallised uranyl acetate U02(C2H302)2,2H20 in 4mL glacial acetic acid and 100 mL water (warming may be necessary). 

Sodium, D. of as zinc uranyl acetate, (g) 467 by flame photometry, 812 Sodium arsenite solution prepn. of standard, 390... 

Sodium tungstate 699 Sodium zinc uranyl acetate 467 Sol 419... 

Dipping solution Dissolve 1 g uranyl acetate in 20 ml water with warming and make up to 100 ml with ethanol [3]. 

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

The structure was solved by the multiple isomorphous replacement technique using four heavy atom derivatives uranyl acetate, plati-nous chloride, tetramethyllead acetate, and p-chloromercury benzoate. All four derivatives gave interpretable heavy atom Patterson syntheses. The heavy atom sites could be correlated between the de-... 

Umbelliferone, pH-dependent change of fluorescence color 44 Universal reagents 4,46,195,376,402,405, 412, 430, 434 Uracil derivatives 44,45 Uranium cations 144 Uranyl acetate reagent 44 Urea... 

Fig.1. Electron micrograph of a mast cell in human heart tissue. The cytoplasm contains numerous secretory granules. The mast cell is adjacent to a coronary blood vessel, surrounded by collagen fibers and close to a myocyte. Uranyl acetate and lead citrate stained. Orig. magnif. lO.OOOx. 

Lyim and co-workers carried out smdies of the Ap(io 35) peptide - derived from residues 10-35 of the p-amyloid responsible for Alzheimer s disease - which forms fibrils composed of parallel p-sheets [62]. The peptide was compared to its C-terminal PEG-derivatised analogue. TEM experiments showed that both formed fibrils [63] (Fig. 21) but the uranyl acetate stain was not found inside the peptide-PEG fibrils, indicating that PEG was at the outer edge of the fibril. 

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