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Kinetics and Mechanisms of the Reaction of Aluminium(III) with Polyaminocarboxylic Acids

  • Claire Τ. Tomany and Michael J. Hynes
Published/Copyright: April 1, 1999
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Abstract

The kinetics and mechanisms of the reactions of aluminium(III) with ethylenediaminetetraacetic acid (EDTA) and diethylenetriaminepentaacetic acid (DTPA) have been investigated in aqueous solution at 25°C and ionic strength 0.5 mol dm-3 NaClO4. Al3+ reacts with the H4DTPA- and H3DTPA2- with rate constants of 2.06(±0.35) and 19.3(±1.6) respectively while Al(OH)2+ reacts with H3DTPA2- with a rate constant of 1.34(±0.20) × 103 dm3 mol-1 s-1. The outersphere association constant for reaction of Al3+ with H3DTPA2- was found to be 175(±38) mol-1 dm3. Al3+ reacts with H3EDTA and H2EDTA2- with rate constants of 4.73(±1.25) and 21.5(±2.21) dm3 mol-1 s-1 respectively. The outer-sphere association constant for reaction of Al3+ with H2EDTA2- is 164(±52.9) mol-1 dm3.

Published Online: 1999-4-1
Published in Print: 1999-4-1

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