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  • Author or Editor: B. Petelenz x
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Abstract  

A very efficient extraction of silver with tetrabutyl dithiopyrophosphate (TBDTPP) is followed by dramatic changes in the structure of the extractant molecule. The IR and NMR spectroscopic studies have revealed that in the presence of Ag+ and NO 3 ions the TBDTPP molecule rearranges first into a molecule containing a P–S–P bridge and one P=O group instead of P–O–P and P=S, respectively, and then into a molecule containing two P–S–C and two P=O groups at a P–O–P bridge.

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Abstract  

The influence of perchloric acid and hydrogen peroxide concentrations on the elution rates of vanadium and titanium from Dowex-50W X 8 resin was studied. The amounts of perchloric acid and of hydrogen peroxide were adjusted to provide an optimum eluent for the separation of vanadium from the irradiated titanium (TiO2) target.

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Summary  

82Rb is a generator produced positron-emitting isotope (T 1/2 = 75 s) that is increasingly being used in positron emission tomography for the characterization of myocardial perfusion. The parent radionuclide of 82Rb, strontium 82Sr, is produced mainly by a (p, 4n) reaction induced by >40 MeV protons on rubidium (85Rb) target. In the present work we propose a new fast and simple procedure for 82Sr separation from the target, based on selective adsorption of rubidium on the inorganic ion-exchanger: cryptomelane MnO2.

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Summary  

The formation of astatide-mercury complexes was investigated in aqueous solutions.The obtained complexes were examined by paper electrophoresis. It wasfound that Hg(OH)At and Hg(OH)I complexes were formed in neutral solution. The stability constants of the obtained complexes were determined by ion-exchange. The preliminary results indicate that the complex of mercury with astatide is much more stable than similar complexes with iodide.

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