Potentiometric titration of thiosulfate ion with silver ion in the presence of sulfite

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  • 亜硫酸塩の存在下における銀イオンによるチオ硫酸イオンの電位差滴定
  • アリュウサンエン ノ ソンザイカ ニ オケル ギン イオン ニヨル チオリュウ

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Description

A potentiometric titration of thiosulfate with silver ions was studied by using a silver ion selective electrode. The recommended procedure is as follows:<BR>(1) Standardization of sodium thiosulfate solution Titrate 100 ml of (0.00050.005) M thiosulfate solution (pH 1.510.5) with 0.1 M silver nitrate solution at room temperature above 20°C.<BR>The relative error was +0.2% and the coefficient of variation was less than 0.2% when the titration was carried out in (1020) minutes.<BR>(2) Determination of sodium thiosulfate in sodium sulfite<BR>Titrate 100 ml of (0.000050.0005) M thiosulfate solution containing large amounts of sulfite with (0.010.1) M silver nitrate solution. Before titration, adjust the solution pH to 1.52.0 with dilute sulfuric acid and the solution temperature at about 60°C.<BR>A small amount of sodium thiosulfate (e.g. 0.025%) was determined with the relative error of +0.6% and the coefficient of variation of 0.3% when the titration was performed slowly in 50 minutes.<BR>This titration method is simple and precise and especially suitable for the assay of a mixture of thiosulfate and sulfite.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 25 (8), 544-548, 1976

    The Japan Society for Analytical Chemistry

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