Spectrophotometric determination of iron(III) with N,N'-bis(2-hydroxybenzyl)ethylenediamine-N,N'-diacetic acid.

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概要

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• <I>N</I>,<I>N</I>′-Bis(2-hydroxybenzyl)ethylenediamine-<I>N</I>,<I>N</I>′-diacetic acid (hbed) reacts with iron(III) to form a red complex having an absorption maximum at 485 nm. The iron(III) complex is so stable that the maximum absorbance of the solution is constant over the pH range from 2.5 to 13.2 and a large excess of reagent is not necessary. Beer's law is obeyed up to 1.6×10<SUP>−4</SUP> mol dm<SUP>−3</SUP> (9 μg cm<SUP>−3</SUP>) of iron(III). The molar absorption coefficient is 3.95×10<SUP>3</SUP> 1 cm<SUP>−1</SUP> mol<SUP>−1</SUP>, and the relative standard deviation for determination of 3.5 μg cm<SUP>−3</SUP> of iron was 0.29%. The molar ratio of iron(III) to hbed was found to be 1 : 1. The effect of 32 diverse ions was examined; only colored aqua metal ions interfere. The present method was applied to the determination of iron in aluminium alloys.

• 公益社団法人 日本化学会の論文

著者

• Katsuyama Tetsuo

  Department Of Chemistry And Chemical Engineering Faculty Of Engineering Yamagata University

• Kumai Toshihiko

  Department of Basic Technology, Faculty of Engineering, Yamagata University

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