The preparation of sorbents composed of polyethylene glycol and metal(II) salts of heteropolyacids has been described. It
has been found that the calcium salt of phosphomolybdic acid of the type Ca3(PMo12O40)2 is precipitated in the presence of polyethylene glycol (m.wt. 1000). In this precipitate one calcium cation combines approximately
with 10.9 ethylene oxide units of polyethylene glycol. The solubility of the sorbents has been found to be several tenths
of a gram per litre of water or 0.1M hydrochloric acid. The sorption of radium has been studied as a function of the composition
of the sorbents. High distribution ratios (KD∼103∼104) have been reached using 0.1M hydrochloric acid solution.