Sensitive extraction-spectrophotometry for iron by ion-association of iron(II)-1, 10-phenanthrolile chelate with methyl orange

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  • 鉄(II)-1,10-フェナントロリンキレートとメチルオレンジのイオン会合による鉄の高感度抽出吸光光度法
  • テツ 2 1 10 フェナントロリン キレート ト メチルオレンジ ノ イオン

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Description

Ferrous-1, 10-phnenthroline chelate, Fe(II) (phen)32+, is quantitatively extracted into 1, 2-dichloroethane by ion-association with methyl orange, and this extraction is applied to a sensitive spectrophotometric determination of iron(II). The procedure is as follows: To a sample solution containing up to 2×10-7 moles of iron are added 5 ml of 3 M hydrochloric acid and 1 ml of 10% hydroxylamine solution. After 10 min, 1 ml of 1 × 10-3 M 1, 10-phenanthroline solution is added and the pH is adjusted to 6.0 with 6 M ammonia. After 30 min, the solution is diluted to about 50 ml with water in a separatory funnel. And then, 10 ml of 3 × 10-3 M methyl orange (MO) solution and 10 ml of 1, 2-dichloroethane are added, and the funnel is shaken for 5 min. The organic phase is dried with filtration through a paper filter and the absorbance at 422 nm is measured against the reagent-blank as a reference. Beer's low is held up to 2 ×10-7 moles of iron in a 10 ml extract., The extracted chelate has a composition of Fe(II) (phen)3(MO)2, and its molar absorptivity at 422 nm is 4.5 × 104. The absorption maximum is due to the absorption of methyl orange extracted into the organic phase. The absorption maximum of methyl orange in an aqueous solution of pH 6.0 is in 470 nm, but all the extracted associates of Zn(phen)3(MO)2, (zephiramine)(MO) and (tetraphenylarsonium) (MO) show the absorption maxima at around 421 nm.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 28 (3), 208-211, 1979

    The Japan Society for Analytical Chemistry

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