Cadmium selenates

Ebert [87VOJ/EBE3] and by Oy(j)kova and Mihov [920YK/MIH], both investigations reporting 2.56 mol(CdSe04)-kg . The review selects  

The monohydrate was the stable phase within the temperature range 263.7 to 371.7 K investigated in [40KLE]. The review selects the interpolated solubility  

The stability constant of CdSe04(aq) was determined by Banks [34BAN] concurrently with the same datum for ZnSe04(aq) as described in Section V.9.1.3. The result for 

Badiello, Feroci, and Fini [96BAD/FER] made polarographic measurements of 1 X 10 M Cd in 0.15 M NaN03 containing selenate concentrations from 0 to 1 x 10 M. The half-wave potential, 1/2, did not change with selenate concentration and it was concluded that no complex formation occurred. The total expected change in 1/2 would be less than 3 mV if the value of the stability constant determined by Banks is correct. It is doubtful if the experimental accuracy of the polarographic work is sufficient to detect it. The value of the stability constant from the conductivity measurements will be selected  

Aruga [78ARU] made calorimetric titrations of 0.17 M cadmium nitrate solution with 0.17 M tetraethylammonium selenate, see Appendix A. The evaluation of the experiment was made as described for zinc in Section V.9.1.3. The selected result is  

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Brus and co-workers produced nanoparticles of CdSe from the pyrolysis of the single-molecular cadmium selenate precursor [Cd(SePh)2].392 The similar metal(benzylthiolate) compounds [M(SCH2C6i Is)2] (M = Zn, Cd) were also used in the solid-state preparation of ZnS and CdS particles and produced mixtures of the hexagonal and cubic phases of the crystallites, with sizes of 5nm, on thermolysis between 200 °C and 400 °C under nitrogen.393 The bis(trialkylsilyl)chalco-genides [(Me3SiE)2Cd] (E = S, Se), prepared by heterocumulene metathesis as in Equation (11), were used to produce nanoparticles. If the reactions are carried out in TOPO, TOPO-passivated CdE nanoparticles can be obtained although there was little control over particle size 394... 

Physicochemical properties of selenates XIX. Heat of formation of cadmium selenate, Zh. Fiz. Khim., 37, (1963), 1588-1592, in Russian, English translation in [63SEL/MAI2]. Cited on pages 276, 474. 

YK/MIH] Oykova, T., Mihov, D., Study on the phase equilibrium in the systems sodium selenate - cadmium selenate - water and sodium selenate - manganese selenate - water at 25°C, Cryst. Res. Technol, 27, (1992), 697-701. Cited on pages 275, 342. 

Cadmium selenate dihydrate CdSe03-2H30 10060-09-0 291.40 orth cry 100 dec 3.62 70.6 ... 

The octahedral radii of the table are applicable to complex ions such as [PtCle]—. The radius sum Pt(IV)—Cl is 2.30 A, and the several reported experimental values for salts of chloroplatinic acid range from 2.26 A to 2.35 A. The radii can also be applied to the sulfides, selen-ides, and tellurides of quadrivalent palladium and platinum (PdS2, etc.), which crystallize with the cadmium iodide structure, consisting of layers of MX octahedra so packed together that each X is common to three octahedral complexes. The average deviation between radius sums and reported distances for these substances is about 0.02 A. 

Human blood levels of selenium are reported to correlate somewhat with soil concentrations of the element (94). In addition, human ingestion of selenized vegetables and grain has resulted in signs of selenium toxicity (146). Ingestion of rice contaminated with cadmium from the effluent of a mining operation was hypothesized as the etiological factor in Itai-Itai disease in man (32). 

Some epidemiological studies report data from populations exposed to selenium in the food chain in areas with high selenium levels in soil. It is likely that selenite, selenate, and the selenium found in food and in dietary supplements comprise the majority of selenium compounds to which oral, off-site selenium exposures will occur at or near hazardous waste sites. Aside from the variation in effective dose, the health effects from exposure to selenate, selenite, and dietary selenium are not expected to differ greatly. However, oral exposures to many other compounds of selenium could occur (primarily through soil or edible plant ingestion) if those compounds were deposited at the site, or if local environmental conditions greatly favor transformation to those forms. Heavy metal selenides, aluminum selenide, tungsten diselenides, and cadmium selenide are used in industry and may end up in waste sites. 

Miscellaneous compounds Cesium trihydrogen selenite Lithium trihydrogen selenite Potassium selenate Methyl ammonium alum (MASD) Ammonium cadmium sulfate Ammonium bisulfate Ammonium sulfate Ammonium nitrate Colemanite Cadmium pyroniobite Gadolinium molybdate... 

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