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Abstract
The molar reaction enthalpies for the interaction of Al 3+, Cd 2+, Pb 2+ and Zn 2+ with ethylenediaminetetraacetic acid (EDTA) in aqueous solution, at pH 8.7, have been determined by thermometric titrimetry as: 48.96 ± 2.56; −40.90 ± 1.52; −45.59 ± 0.43; and −14.98 ± 0.20 kJ mol −1 respectively. A concentration range for the analytical determination of each of these metal ions is established and some rationalisation of the reactions involved is attempted. An interference study involving mixed metal-EDTA systems is interpreted in terms of the relative magnitudes of the corresponding complex stability constants involved, and supports the analytical significance of the overall enthalpy data for these systems.
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