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Semi-automatic catalytic titrations based on the 1,4-dihydroxyphthalimide dioxime/iodate/nickel system

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Summary

A new system, in which the nickel-catalysed oxidation of 1,4-dihydroxyphthalimide dioxime by iodate as the indicator reaction, is described. This system can be used for semi-automatic titration of aminopolycarboxylic acids because of their inhibitory effect on the indicator reaction. Amounts of EDTA and DCTA in the range 700–6000μg were determined with an error of about 1%. The method has also been used for the indirect catalytic titrimetric determination of Ni(II), Hg(II) and Fe(III) with good results.

Zusammenfassung

Die von Nickel katalysierte Oxydation von 1,4-Dihydroxyphthalimiddioxim durch Jodat wird als neue Indikator-Reaktion beschrieben. Sie kann für die halbautomatische Titration von Aminopolycarbonsäuren wegen deren Hinderungseffekt auf diese Reaktion verwendet werden. Mengen von 700 bis 6000 μg ÄDTA und DCTA wurden mit einem Fehler von etwa 1% bestimmt. Außerdem wurde die Reaktion für die indirekte katalytische Titration von Ni(II), Hg(II) und Fe(III) mit gutem Erfolg angewendet.

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Gomez Hens, A., Ternero, M., Pérez-Bendito, D. et al. Semi-automatic catalytic titrations based on the 1,4-dihydroxyphthalimide dioxime/iodate/nickel system. Mikrochim Acta 71, 375–384 (1979). https://doi.org/10.1007/BF01197409

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  • DOI: https://doi.org/10.1007/BF01197409

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