Abstract
The complex species formed in aqueous solution between Fe(II) and N-methyliminodiacetic acid (MIDA), N-ethyliminodiacetic acid (EIDA) and N-propyliminodiacetic acid (PIDA) were studied at 25°C and ionic strength 0.1 M in KCl. The experimental potentiometric data were analysed with the least-squares computer program LETAGROP, taking into account hydrolysis of the Fe(II) ion. The ionization constants of MIDA, EIDA and PIDA acids are determined for the corresponding ionic strength and temperature. The following complex species were found (ligands, H 2C): MIDA, [FeHC] +, FeC and [FeC 2] 2–; EIDA, FeC and [FeC 2] 2–; PIDA, FeC, [FeC 2] 2– and [Fe(OH)C] –. The corresponding stability constants were determined.
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