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- Author or Editor: Ľ Vašeková x
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Abstract
The radiation-induced oxidation of bis/1,2-dicarbollyl/cobalt/III/ acid to 8-monohydroxy-, and 8,8
-dihydroxy-derivatives was observed in two-phase system of 4 to 96 vol. % of CCl4 and H2O. Carbon tetrachloride increases the radiation yields of the oxidation of the acid in the investigated dose region, nature of the radiolytic products being the same. The partial radiation yields in the system were ascertained.
Abstract
Halogenated hydrocarbon emulsion liquid membranes (e.g. trichlorobenzene) which were stabilized with polyamine tenside, using 18-crown-6 and picric acid as carriers, were applied to separation of strontium and calcium. Application in the separation of Sr/Ca enable us to enhance preconcentration factor for strontium due to decreasing occlusion of freed solution and better hydrodynamic parameters of the emulsion.
Abstract
The radiation-induced oxidation of bis/1,2-dicarbollyl/cobalt/III/ acid by OH radicals in deaerated/aerated aqueous solutions has been investigated. 8-Monohydroxy-, and 8,8
-dihydroxy-derivatives have been identified as products of the 
-radiolysis. For the different conditions the following radiationchemical yields were observed: in the presence of N2 atmosphere G/OHDCC/=1.58, in aerated solution 2.11 and 3.04 in a solution saturated with CCl3.
Abstract
The selective separation ability of the cyclic crowns, known for liquid-liquid extraction, e.g. alkali metals, is found to be effective for emulsion membrane extraction. 18-C-6, DB-18-C-6, DC-18-C-6 crowns were used as carriers. The co-transport of the ionic pair SrL2+. 2A through the membrane has been studied. Calcium was considered as a main competing ion. Even in the case of 20-fold preconcentration, there have been found conditions under which the pertraction process can reach Sr/Ca separation factors of about 500 and the yield of strontium is high (95–98%). The presence of calcium up to 1000-fold excess has no influence on the yield of strontium (1.10–5M). The calcium content in the isolated emulsion was caused by second emulsification of the outer solution. The influence of potassium on strontium pertraction has been studied and some transport data of Cs and Y have been obtained.
