Zusammenfassung
Das Verfahren beruht auf der Tatsache, daß in Britton-Robinson-Puffer (mit 50 μmol/l HEDTA und 5 mmol/l KBrO3) im Potentialbereich von +0,2 bis −0,3 V gegen SKE ein gut definierter puls-polarographischer Peak für Eisen(III) auftritt. Der Peakstrom ist im Vergleich zu dem des Fe(III)/EDTA-Komplexes sehr groß und ist unter optimalen Bedingungen im Konzentrationsbereich von 1,00·10−8 bis 3,58·10−6 mol/l der Eisen(III)-Konzentration proportional. Die relative Standardabweichung beträgt 1,38% bzw. 0,54% (n=5) für 3,58·10−7 mol/l bzw. 1,79·10−6 mol/l Fe(III). Die berechnete Nachweisgrenze liegt bei 5,2·10−9 mol/l Fe(III). Das Verfahren wurde zur Eisenbestimmung in Schnee- und Regenwasser eingesetzt.
Summary
A differential pulse polarographic method for the determination of iron employing the catalytic maximum wave has been studied. A well-defined differential pulse polarographic peak for iron(III) in Britton-Robinson buffer solution containing 50 μmol/l N-(2-hydroxyethyl) ethylenediamine N,N′,N′-triacetic acid (HEDTA) and 5 mmol/l KBrO3 is observed in the potential range from +0.2 to −0.3 V vs. SCE. The peak current is very large compared to that of the Fe(III)/EDTA complex, being proportional to the concentration of iron(III) between 1.00×10−8 and 3.58×10−6 mol/l under optimum conditions. The relative standard deviations for 3.58×10−7 mol/l and 1.79×10−6 mol/l iron(III) were 1.38 and 0.54%, respectively (n=5), and the calculated detection limit was 5.2×10−9 mol/l iron(III). The method has been applied to the determination of iron in fresh snow and rain waters.
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This work was supported in part by a Grant-in-Aid for Scientific Research from Hokkaido-prefecture, 1982.
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Hasebe, K., Yamamoto, Y., Ohzeki, K. et al. Determination of traces of iron with the catalytic maximum wave in differential pulse polarography. Z. Anal. Chem. 323, 464–468 (1986). https://doi.org/10.1007/BF00470761
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DOI: https://doi.org/10.1007/BF00470761