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A Sensitive Spectrophotometry Determination of Iron(III) with Amines and Thiocyanate

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Abstract

The coloration of iron(llt)-thiocyanate complexes was enhanced by the addition of amine to acidic solution containing the nonionic surfactant. A coexistence of 0.25% Capriquat (trioctylmethylammonium chloride) brought about a 1.5-fold increase in sensitivity ( molar absorptivity: 2,95× 104 mol-1 dm3 cm-1 at 485 nm) of the spectrophotometry iron determination when compared to a method containing no amines. The constant absorbance was obtained within thiocyanate concentration range of 0.1 to 3.0 mol dm-3. An optimal pH range slightly depended upon the thiocyanate concentrations. The pH range from 1.0 to 2.5 is recommended at the 0.20 mol dm-3 potassium thiocyanate. A color of the solution was stable for 3 h in the presence of 10%(v/v) Triton X-100.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Yamaguchi University, Yoshida, Yamaguchi, 753, Japan

    Kenjiro Hayashi, Yoshiaki Sasaki, Shoji Tagashira, Yoshiko Soma, Tomohide Ichinose & Hiroshi Akiyama

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  1. Kenjiro Hayashi
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  2. Yoshiaki Sasaki
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  3. Shoji Tagashira
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  4. Yoshiko Soma
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  5. Tomohide Ichinose
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  6. Hiroshi Akiyama
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Hayashi, K., Sasaki, Y., Tagashira, S. et al. A Sensitive Spectrophotometry Determination of Iron(III) with Amines and Thiocyanate. ANAL. SCI. 2, 457–460 (1986). https://doi.org/10.2116/analsci.2.457

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  • DOI: https://doi.org/10.2116/analsci.2.457

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