Uranyl iodate

The potassium salt, K(U02)(I03)j.3H20, is precipitated when potassium iodate is added in large excess to uranyl iodate solution as a light yellow powder of density 3-706. It is sparingly soluble in and is hydrolj-sed by water it is converted into uranyl iodate by excess of uranyl nitrate. 

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,... 

Most recently it was shown that unlike iodates, mild hydrothermal conditions are not required from a thermodynamic standpoint to synthesize these compounds, and that relatively high-temperature molten salts can be used to facilitate the crystal growth of novel uranyl tellurites as demonstrated with the reports of A2[(U02)3(Te03)202] (A = K, Rb, and Cs) [29] and K4[(U02)5(Te03)205] [30],... 

The extent of this decomposition in uranyl-sulfatc solutions above 200°C is not known with certainty, since all observations have been made on samples that have been withdraivn from the sy.stem, cooled, and reduced in pressure before analysis. Although the iodine in such samples is principally elemental, some iodate is always present, possibly because of reversal of the iodate decomposition as the temperature drops in the sample line. Such measurements therefore give an upper limit to the iodate content of the solution. If periodate is introduced into uranyl-sulfate solution-at elevated temperatures, it is reduced before a sample can be taken to detect its presence. Iodide similarly disappears if an overpressure of oxygen is present, although iodide to the extent of 40% of the total iodine has been found in the absence of added oxygen [11]. 

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