The rapid determination of sulfide, thiosulfate, and polysulfide in the lixiviation water of blast-furnace slag by means of argentimetric potentiometric titration.

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概要

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• Sulfide, thiosulfate, and polysulfide ions in their mixtures were determined potentiometrically with a silvernitrate standard solution. These three species can be precisely determined from two titrations for each sample with the coefficient of variation of 0.3% at the concentration level of 5×10<SUP>−4</SUP> M (1 M= 1 mol dm<SUP>−3</SUP>). One aliquot is titrated, after making the titrand acidic with an acetate buffer (pH=4), to get the end points of the sulfide and thiosulfate ions respectively, in the presence of free sulfur. The other is titrated, after the sulfitolysis of the sample solution, to show the end points of the sulfide and thiosulfate (the original thiosulfate plus the thiosulfate which is formed from polysulfide) ions in the presence of excess sulfite. The addition of calcium nitrate is effective in making the end points clear and accurate. This method was applied to determine these species in lixiviation water of blast-furnace slag.

• 公益社団法人 日本化学会の論文

著者

• Ikeda Sanae

  Department Of Chemical Science And Technology Faculty Of Engineering The University Of Tokushima

• Hisano Takeo

  Department of Applied Chemistry Faculty of Engineering Tokushima University

• Satake Hiromu

  Department of Applied Chemistry, Faculty of Engineering, Tokushima University

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• The rapid determination of sulfide, thiosulfate, and polysulfide in the lixiviation water of blast-furnace slag by means of argentimetric potentiometric titration.

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