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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  NaClO 4 . Al 3+  reacts with the H 4 DTPA -  and H 3 DTPA2 -  with rate constants of 2.06(±0.35) and 19.3(±1.6) respectively while Al(OH) 2+  reacts with H 3 DTPA 2-  with a rate constant of 1.34(±0.20) × 10 3  dm 3  mol -1  s -1 . The outersphere association constant for reaction of Al 3+  with H 3 DTPA 2-  was found to be 175(±38) mol -1  dm 3 . Al 3+  reacts with H 3 EDTA and H 2 EDTA 2-  with rate constants of 4.73(±1.25) and 21.5(±2.21) dm 3  mol -1  s - 1 respectively. The outer-sphere association constant for reaction of Al 3+  with H 2 EDTA 2-  is 164(±52.9) mol -1  dm 3 .

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