The enthalpies of complex formation between ethylenediamine-N,N′-disuccinic acid (H 4 A) and Cd 2+ ions were determined calorimetrically at 298.15 K and ionic strengths of 0.5, 1.0, and 1.5 (KNO 3 ). The thermodynamic characteristics of formation of the CdA 2− and CdHA − complexes at fixed and zero ionic strengths were calculated. The values obtained were interpreted.
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Lytkin et al. (2009) studied this question.