Abstract
Methylene diphosphonic acid (MDP) is used as a selective titrimetric reagent for thorium. In the presence of trans-1,2- diaminocyclohexane- N, N, N′, N′-tetraacetic acid (DCTA) a soluble binuclear ternary complex, Th 2 (DCTA) 2 (MDP) is formed. The titration is carried out with MDP in a slightly acidic medium, buffered with ethylenediamine (EDA), using methylthymol blue as indicator. For the determination of MDP in labelling kits, two 5 mL aliquots of thorium nitrate solution (4 mM) are respectively titrated with 2.000 mM MDP and the MDP solution prepared from the labelling kit.
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