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  • 1 Technical University of Prague Department of Nuclear Chemistry Břehová 7 115 19 Prague 1 Czechoslovakia
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Coprecipitation of radium with precipitates composed of polyethylene glycol — metal(II) salts of heteropolyacids has been described. The calcium salt of phosphomolybdic acid, precipitated in the presence of polyethylene glycol (m. wt. 1000) has been chosen for the more detailed study of radium coprecipitation. The influence of acidity, amount of precipitate, concentration of calcium cations and of polyethylene glycol on radium coprecipitation has been determined. On the basis of the results obtained, suitable conditions for quantitative concentration of radium from aqueous solutions have been found. The described method of radium concentration can be used for determination of radium in aqueous samples.