Compleximetric titrations of iron(III) and iron(II) with triethylenetetraminehexaacetic acid |
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Authors: | Leo Harju Anders Ringbom |
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Institution: | Department of Chemistry, Åbo Akademi, ÅboFinland |
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Abstract: | The stability constants of the iron(II) complexes of TTHA (triethylenetetraminehexaacetic acid) were calculated from measured pH and redox potentials. The values of the cumulative constants obtained were: log βFeL= 15.37, log βFeHL = 23.83, log βFeH2L = 28.0, log βFe2L = 24.73. On the basis of these values and the previously determined constants ofiron(III) complexes, the possibilities of titrating iron(III) and iron(II) with TTHA were investigated. Depending on the experimental conditions, either FeL or Fe2L formed. Actual titrations were in agreement with the developed theory. The influence of aluminium and titanium on titrations of iron(III) solutions was elucidated. |
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