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  • Author or Editor: A. Argekar x
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Abstract  

A rapid method has been described for the quantitative extraction of milligram amounts of Mn/II/ with 2-PRONAPOX into CHCl3. The extraction coefficient /E/ of Mn/II/ between CHCl3 and aqueous solution containing 0.2M NH4Cl shows a maximum value of E=143 at pH 10.5. The percentage extraction is better than 98% in the pH range from 9 to 11 and an equilibration time of 6 min. The effects of anions and cations have been studied. The stoichiometry of metal: reagent determined by substoichiometric extraction and slope ratio method is found to be 12. The decontamination factors for most of the elements are better than 104 in the substoichiometric extraction of Mn/II/.

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Abstract  

Thorium was extracted from a mixture of nitric acid and NaNO3 of 0.01M each at pH 2.2 on a column of silica gel coated with TOPO. Thorium was separated from alkalis, alkaline earths, chromium, iron, cobalt, nickel, zinc, cadmium, mercury, lead, trivalent rare earths, platinum group metals, chloride, phosphate and acetate in binary mixtures by selective extraction of thorium. Thorium was separated from cerium (IV), zirconium, uranium and molybdenum by selective elution of thorium with 0.01M H2SO4. The method was extended for the analysis of thorium in monozite ore.

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Abstract  

A rapid method has been described for the quantitative extraction of milligram amounts of Co/II/ with 2-PRONAPOX into CHCl3. The extraction coefficient /E/ of Co/II/ between CHCl3 and aqueous solution shows a maximum value /E=151/ at pH 8. The percentage extraction is better than 98% in the pH range from 8 to 10 and at an equilibration time of 6 min. the effects of anions and cations have been studied. The stoichiometry of metal: reagent determined by substoichiometric extraction and slope ratio method is found to be 12. The decontamination factors for most of the elements in the substoichiometric extraction of Co/II/ are better than 104.

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Abstract  

This paper describes the results of photoreduction of uranyl (UO2 2+) ion to U4+ in 0.2M HNO3 and ethanol using a 308 nm XeCl excimer laser. The effects of different concentrations of ethanol and the addition of sulfamic acid on the quantum yield for U4+ formation are discussed.

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