A sensitive spectrophotometric determination of iron(III) with amines and thiocyanate.

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

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The coloration of iron(III)-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: 2.95×104mol-1 dm3 cm-1 at 485nm) of the spectrophotometric iron determination when compared to a method containing no amines. The constant absorbance was obtained within thiocyanate concentration range of 0.1 to 3.0mol 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 0.20mol dm-3 potassium thiocyanate. A color of the solution was stable for 3h in the presence of 10%(v/v) Triton X-100.

Journal

  • Analytical Sciences

    Analytical Sciences 2 (5), 457-460, 1986

    The Japan Society for Analytical Chemistry

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