Abstract
A method is presented for the determination of thorium in samples resulting from the leaching of monazite sands and other raw materials with sulfuric acid, and from subsequent stages in the separation of thorium by solvent extraction processes. Tri-n-octylphosphine oxide (TOPO) dissolved in cyclohexane is used to extract thorium by diluting the sulfate and phosphate concentration with IM nitric acid and sufficient sodium nitrate. The maximum permissible concentrations of sulfate and phosphate are 0.5 and 0.06M, respectively. Thorium is determined colorimetrically after backextraction with 0.3M sulfuric acid. Cerium(III) and the other trivalent rare earths are not extracted. The method is essentially specific for thorium and requires about one fourth the time required by conventional procedures. Thorium has been determined in the concentration range from 0.01 to 5.8 mg per ml with comparable precision. (auth)
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