Abstract
The dissociation constants of iminodiacetic acid and nitrilotriacetic acid have been determined in sodium perchlorate medium (μ = 0.5) at 25°. A potentiometric study of the europium(II) complexes of these acids has indicated the formation of 1:1 and 1:2 species; the formation constants have been determined. A MHA complex is formed in acidic medium in the presence of nitrilotriacetic acid. The polarographic reduction of europium(III) in the presence of these complexing acids is irreversible; in the presence of iminodiacetic acid, the reaction at the electrode is preceded by dissociation of the ▪ complex.
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