Leaching behavior of heavy metals and metalloids from geomaterials under reducing conditions

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  • KATO Takahiro
    Institute of Technology, Shimizu Corporation Research committee on methods of investigation, labo test and prediction for scientific rationality evaluation of anticontamination measures in soil environment
  • ABE Natsuki
    Material Cycle Division, National Institute for Environmental Studies Research committee on methods of investigation, labo test and prediction for scientific rationality evaluation of anticontamination measures in soil environment
  • ITO Kenichi
    Organization of Global Collaboration, University of Miyazaki Research committee on methods of investigation, labo test and prediction for scientific rationality evaluation of anticontamination measures in soil environment
  • INUI Toru
    Graduate School of Engineering, Division of Global Architecture, Osaka University Research committee on methods of investigation, labo test and prediction for scientific rationality evaluation of anticontamination measures in soil environment
  • OYAMA Sho
    Research Institute of Technology, Osaka R&D Center, Konoike Construction Co. LTD. Research committee on methods of investigation, labo test and prediction for scientific rationality evaluation of anticontamination measures in soil environment
  • KATO Masahiko
    Department of Agricultural Chemistry, Meiji University Research committee on methods of investigation, labo test and prediction for scientific rationality evaluation of anticontamination measures in soil environment
  • SAKANAKURA Hirofumi
    Material Cycle Division, National Institute for Environmental Studies Research committee on methods of investigation, labo test and prediction for scientific rationality evaluation of anticontamination measures in soil environment
  • TSUCHIYA Shuji
    OYO Corporation Research committee on methods of investigation, labo test and prediction for scientific rationality evaluation of anticontamination measures in soil environment
  • TAKAI Atsushi
    Graduate School of Global Environmental Studies, Kyoto University Research committee on methods of investigation, labo test and prediction for scientific rationality evaluation of anticontamination measures in soil environment
  • KATO Tomohiro
    Graduate School of Global Environmental Studies, Kyoto University
  • KATSUMI Takeshi
    Graduate School of Global Environmental Studies, Kyoto University

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Other Title
  • 異なる原理で還元環境とした地盤材料からの重金属溶出特性
  • －化学物質の添加や微生物の活性化による方法の評価－
  • - Feasibility of chemical and biological treatments -

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<p>To establish an evaluation method for the leaching behavior of heavy metals and metalloids from geomaterials exposed to a reducing environment, we simulated a reducing environment by adding 0.01 mol/L sodium ascorbate (chemical method) and 0.17 – 0.34 mol/L organic carbon (biological method), and examined changes in Eh, pH and the leaching concentration of heavy metals. In the excavated rock, the average Eh was −50 mV in the chemical method and −154 mV in the biological method, which was lower than non-additive system (249 mV). Under these conditions, significant increase in leaching concentration of arsenic was not observed. Coal ash mixed material and concrete exhibited Eh values lower than 0 mV with the chemical method, but did not necessarily fall below 0 mV with the biological method regardless of conditions. Since the leaching behavior of heavy metals and metalloids are affected by pH and bacterial activity as well as Eh, these chemical indexes should be carefully evaluated under simulated reducing conditions.</p>

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