Abstract
Calorimetric titrations using the long-lived isotope of curium (curium-248) have been conducted with nitrilotriacetate, trans-1,2-cyclohexanedinitrilotetraacetate, and trimethylenedinitrilotetraacetate. The data plus the stability constants measured previously allowed calculations of the thermodynamic parameters of the 1:1 complexation. Similar titrations were conducted with europium to provide comparison of the lanthanide and actinide trivalent ion behaviors. The enthalpy values for the amino polycarboxylate complexing of Cm(III) are greater than those for Eu(III). However, the entropy values for the complexing of both cations are similar. These results are comparable to the previously reported data for EDTA. 13 references, 2 figures, 3 tables.
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