Selective extraction spectrophotometric determination of iron by utilizing the peculiar absorption of iron(II)-2-(2-thiazolylazo)-5-dimethylaminophenol complex.
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概要
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Thiazolylazo compounds react with iron(II) to form brownish complexes, which show a characteristic absorption in near-infrared region. These compounds possess the hydroxyl group in the <I>o</I>-position next to the azo group. Among them, iron(II)-2-(2-thiazolylazo)-5-dimethylaminophenol complex has the absorption maximum at 760 nm in chloroform; the optimum pH for iron extraction lies between 8.2–10.0. Beer's law holds up to 2.0 μg cm<SUP>−3</SUP> of iron and the molar absorption coefficient is 2.70×10<SUP>4</SUP> dm<SUP>3</SUP> mol<SUP>−1</SUP> cm<SUP>1</SUP>. The composition and the extraction constant of the complex are estimated to be Fe: TAM=1 : 2 and log<I>K</I><SUB>ex</SUB>=−4.20±0.04, respectively. Since the present method utilizes the specific absorption of the iron(II)-TAM complex, the presence of many ions is tolerable, especially of 3d type metals. The method was applied to the determination of traces of iron dissolved in river and sea waters with satisfactory results.
- 公益社団法人 日本化学会の論文
著者
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Ueda Kazumasa
Department Of Chemistry And Chemical Engineering Faculty Of Engineering Kanazawa University
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Yamamoto Yoshikazu
Department Of Biological Production Faculty Of Bioresource Sciences Akita Prefectural University
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Kiyota Yasushi
Department of Industrial Chemistry, Faculty of Technology, Kanazawa University
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