Spectrophotometric determination of iron(III) after separation by adsorption of its 5-chloro-7-iodo-8-quinolinol complex on microcrystalline naphthalene.

概要

論文の詳細を見る
A procedure is described for the spectrophotometric determination of iron(III) at ppm levels with 5-chloro-7-iodo-8-quinolinol. Iron(III) reacts with the reagent in an acidic solution to form a water-insoluble blue-black complex, which can be quantitatively adsorbed on the surface of freshly precipitated microcrystalline naphthalene at room temperature. The separated iron(III) complex is dissolved in N,N-dimethylformamide, together with the naphthalene, and the absorbance of the resulting solution is measured at 480 nm. Beer's law is obeyed over the range of 5–88 μg of iron in 10 ml of the solvent. The molar absorptivity of the complex was found to be 6.3×103 l mol−1 cm−1 at 480 nm. The effects of various factors, such as the pH, the amounts of the reagent and naphthalene, and diverse ions, were also examined. The proposed method was satisfactorily applied to the determination of iron in several selected samples, including standard reference materials, aluminum metal, and natural water.
公益社団法人日本化学会の論文