Effect of pH in the Coprecipitation with Iron(III) Hydroxide on the Determination of Chromium(VI) in the Eluate from Incinerated Ash

DOI Web Site
  • MASAI Sasami
    Studies in Environmental Science, Graduate School of Environmental Science and Business Administration, Tottori University of Environmental Studies
  • MOMGI Hideyuki
    Faculty of Environmental Studies, Tottori University of Environmental Studies
  • ARITA Masakazu
    Tottori Pref. Inst. of Public Health and Environmental Science

Bibliographic Information

Other Title
  • 焼却灰溶出液中の六価クロムの定量における水酸化鉄（III） 共沈時のpHの影響

Abstract

<p>In this study, the effect of coprecipitation pH for hexavalent chromium determination in iron(III) hydroxide coprecipitation method was examined. The pH of the sample solution decreased in the stage of ammonium iron(III) sulfate addition and heating and cooling. The recovery rate of hexavalent chromium was affected by the pH after heating and cooling. Each NH3 solution and sodium hydroxide solution was used as alkaline agents, the recovery rate of hexavalent chromium increased with an increase of coprecipitation pH and the recovery rate was more than 90 % at a the pH of more than 8.87. The effect of coprecipitation pH was also investigated using a solution leached from incinerated ash and the determined value increased with an increase in pH. Therefore, the recovery rate of hexavalent chromium improved when the pH of the sample solution was alkalified enough to retain alkaline after heating and cooling. Six incinerated ash leaching solutions were examined using the sodium hydroxide (pH 10.00±0.05) and NH3 solution (pH 8.70±0.05) for alkaline agents. Consequently, recovery rates of more than 89.6 % were obtained for the sodium hydroxide solution (pH 10.00±0.05) whereas the NH3 solution (pH 8.70±0.05) results were low values.</p>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 71 (12), 679-685, 2022-12-05

    The Japan Society for Analytical Chemistry

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