Abstract
The successive determination of thorium and rare earths with diethylenetriaminepenta-acetic acid (DTPA) and triethylenetri-aminehexa-acetic acid (TTHA) is described. Such a determination cannot be carried out with the commonly used EDTA or diamino-cyclohexanetetraacetic acid (DCTA). By combined titrations with DTPA and TTHA it is possible to determine successively not only thorium and rare earths, but also some bivalent elements which might be present in the material to be analysed.
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