Abstract
Systematic studies on the anion-exchange behaviour of thorium in malic acid solution on Amberlite IRA-401 have been carried out. Acids such as HNO3, HCl, H2SO4, HClO4 and salts such as NH4Cl, (NH4)2SO4, NaClO4, NaCl and NaNO3 have been tested as eluants for thorium, their efficiency being evaluated in terms of their distribution coefficients. HNO3 is the best eluent for thorium. Methods have been developed for the separation of thorium from several elements in malic acid media using selective adsorption or selective elution. The proposed method is applied to the analysis of thorium in monazite where HClO4 is a better eluant than HNO3. The method is simple and the accuracy about ±3%.
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