エチルバイオレットを用いるヘテロポリ酸の抽出とリン,ヒ素(V)及びヒ素(III)の吸光光度定量

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タイトル別名
  • エチルバイオレットを用いるヘテロポリ酸の抽出とりん，ひ素（Ｖ）及びひ素（ＩＩＩ）の吸光光度定量
  • Solvent extraction of heteropolyacid with ethyl violet and spectrophotometric determination of phosphorus, arsenic (V), and arsenic (III)
  • エチル バイオレット オ モチイル ヘテロポリサン ノ チュウシュツ ト リン

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Solvent extraction and spectrophotometric determination of phosphorus, arsenic (V), and arsenic (III) with molybdate and ethyl violet have been studied. Molybdophosphate and molybdoarsenate were extracted into a mixed cyclohexane-4-methyl-pentane-2-one solvent (1 : 3 v/v). The absorbance of the organic phase at 602 nm was measured and each calibration curve was found to be linear in the range 01 μg of phosphorus and 02 μg of arsenic (V), respectively. The molar absorptivity of phosphate is almost equal to that of arsenate; the value is 2.8× 105l mol-1 cm-1 (1) In the presence of sodium thiosulfate, only phosphorus existing as orthophosphate was extracted into the organic phase. (2) In the absence of oxidizing or reducing agents, phosphorus existing as orthophosphate and arsenic (V) were extracted. (3) In the presence of potassium dichromate, phosphorus existing as orthophospate and arsenic existing as arsenic (III) and (V) were extracted. From the absorbance of the organic layer obtained by the procedure (1), phosphorus was determined. From the difference in the absorbance between the two organic layers obtained by the procedure (2) and (1), and by the procedure (3) and (2), arsenic (V) and arsenic (III) were determined, respectively. River and hot spring waters up to 10 ml were transferred into stoppered test tubes and acidified with sulfuric acid, and heated in a water bath (above 90°C) for 40 min, and subsequently these were analyzed according to the procedures (1), (2), and (3). Phosphorus and arsenic in river and hot spring waters at the several 10 ppb amounts were determined by the proposed method.

収録刊行物

  • 分析化学

    分析化学 31 (12), 717-721, 1982

    公益社団法人 日本分析化学会

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