A note on the determination of thorium in the presence of some bivalent metal ions.
A new method for complexometric determination of thorium in the presence of bivalent metals without their masking is presented. Two aliquots of metal solution are necessary. In one the sum of the thorium and other metals is determined by DTPA titration. The second aliquot is treated with Zn(2)TTHA complex. Only thorium, forming a 1:1 complex with TTHA, displaces twice its molar amount of zinc from the complex, while other elements displace only an equimolar amount of zinc. The amount of thorium corresponds to the difference of consumption in the two titrations.
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Analytical Laboratory J. Heyrovský Institute of Physical Chemistry and Electrochemistry Prague 1, Jilská 16 Czechoslovakia.
Veselý
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