メチルオレンジを用いる塩素酸イオンの吸光光度定量

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書誌事項

タイトル別名
  • Spectrophotometric determination of chlorate ion with Methyl Orange
  • メチルオレンジ オ モチイル エンソサン イオン ノ キュウコウ コウド テイ

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抄録

Under suitable high chloride ion concentration in an acidic solution {(37) MH2SO4}, chlorate ion reacts with chloride ion to form chlorine which reacts quantitatively with Methyl Orange to decrease the absorbance (at 504 nm). Therefore, the decreased absorbance of Methyl Orange by this reaction was used to determine the chlorate ion concentration. Analytical procedure is as follows. Mix 1 ml of the sodium chlorate solution {(1×10-51×10-4)M} with 10 ml of 6.3×10-3 g/l Methyl Orange solution which contains 6 M sulfuric acid and 0.3 M chloride ion. After shaking for about 20 min, measure the absorbance at 504 nm against the reagent blank. The molar absorptivity of Methyl Orange is 4.63×104 l mol-1 cm-1 at 504 nm and is constant at room temperature for at least 2 days. Less than 5×10-3 M of Mg2+, Zn2+, Co2+, Ni2+, Pb2+, Al3+, Mn2+, Fe3+, Cu2+ and of SO42-, CO32-, PO43-, F-, ClO-, ClO2-, ClO4- do not interfere with analysis, where in the solution containing ClO-, ClO2-, ClO3- and ClO4-, the chlorate ion can be determined after reducing ClO- and ClO2- with KBH4.

収録刊行物

  • 分析化学

    分析化学 28 (9), 566-568, 1979

    公益社団法人 日本分析化学会

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