クロラニル酸バリウムを用いる硫酸イオンの高感度吸光光度定量

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タイトル別名
  • Highly sensitive photometric determination of sulfate ion with barium chloranilate
  • クロラニルサン バリウム オ モチイル リュウサン イオン ノ コウカンド キ

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Chrome Azurol S (CAS) was found to be effective for increasing the sensitivity of the barium chloranilate method for sulfate ion. On the treatment of sulfate ion {(525)μg} with barium chloranilate (40 mg) in 80% 2-propanol aqueous medium (17 ml), free chloranilate anion was released stoichiometrically by the sulfate. The precipitate of barium sulfate was filtered off. The chloranilate in a portion (15 ml) of the filtrate was then separated from the 2-propanol on a column (10 cm, diam. 5 mm) of activated alumina (0.16 g), by washing the column with water and eluting the chloranilate with 4 ml of 0.1 M aqueous ammonia. The chloranilate anion in the eluate was extracted with tris (1, 10-phenanthroline)iron(II), Fe(phen)32+, at pH2 into nitrobenzene (5ml) as an ion-pair complex. After removal of the aqueous layer the nitrobenzene layer was shaken again with 12.5 ml of an aqueous solution (pH 5) containing CAS (10-5 M) for 3 min. The chloranilate in the complex was quantitatively replaced by CAS, thus forming CAS-Fe(phen)3 complex in the nitrobenzene. The absorbance of the CAS complex was measured at 600 nm with 1-cm cells against a reagent blank. The ε value of the present method was 2.3 × 104lmol-1cm-1. For a rain sample containing 2.20 ppm of sulfur oxides the coefficient of variation of 6.60% was obtained in six replicate determinations.

収録刊行物

  • 分析化学

    分析化学 28 (10), 623-627, 1979

    公益社団法人 日本分析化学会

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