Uranyl selenites

Complex Uranyl Selenites.—A series of crystalline compounds, rich in selenious acid, have been prepared" by decomposing uranyl salts in solution by means of selenious acid or an alkali selenite. The products are yellow- in colour and insoluble in %vater. Compounds of the follow-ing composition have been prepared ... 

The structure of PbU02(Se03)2 contains two-dimensional uranyl selenite sheets that are substantially different than those found in other uranyl selenite compounds. The selenite ligands chelate and bridge between uranyl moeities. 

CES/OOS] Cesbron, F., Oosterbosch, R., Pierrot, R., Une nouvelle espece minerale la marthozite. Uranyl-selenite de cuivre hydrate, Bull. Soc. Fr. Mineral. Cristallogr., 92, (1969), 278-283, in French. Cited on page 636. 

VOC/BLA] Vochten, R., Blaton, N., Peeters, O., Deliens, M., Piretite, Ca(U02)3(Se03)2(0H)4.4H20, a new calcium uranyl selenite from Shinkolobwe, Shaba, Zaire, Can. Mineral, 34, (1996), 1317-1322. Cited on page 636. 

Loopstra B. O. and Brandenburg N. P. Uranyl selenite and uranyl tellurite. Acta cryslallogr., B34, 1978, 1335-7. 

Selenates, selenites, and tellurates. Uranyl selenates and selenites have been prepared and can be expected to have the same coordination features as the sulfates and sulfites. In addition to the selenate, U02Se04, the ternary selenite (U02)2(OH)2(Se03), has been reported to form in... 

Fig. 50. Uranyl selenate-selenite sheet in the structure of [C5Hi4N]4[(U02)3(Se04)4(HSe03)(H20)](H2Se03)(HSe04).

KRY/CHU] Krylov, E. 1., Chukhlantsev, V. G., Uranyl and thorium selenites, Zh. Anal. Khim., 12, (1957), 451-456, in Russian, English translation in [57KRY/CHU2]. Cited on pages 389, 391. 

XPS is one of the most widely used non-in-situ surface-sensitive techniques. It has been used to study sorption mechanisms of inorganic cations and anions such as Cu, Co, Ni, Cd, Cr, Fe, selenite, and uranyl in soil and aquatic systems (19-28). The disadvantage of invasive non-in-situ techniques is that they often must be performed under adverse experimental conditions, e.g., desiccation, high vacuum, heating, or particle bombardment. Such conditions may yield data that are misleading as a result of experimental artifacts (2,29,30). Review articles on XPS, AES, and SIMS are available (29,31,32). 

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