Fixation of Soluble Selenium in Contaminated Soil by Amorphous Iron (hydr) oxide.
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Decontamination of selenium has been a common concern both in agriculture and industry, since high concentration of selenium impacts the ecosystem and human health through water and food. In this study, a simple and effective chemical treatment method for selenium contaminated soil was proposed. Based on the results of selenite and selenate adsorption on 4 kinds of iron (hydr)oxides (goethite, hematite, lepidocrocite, and amorphous iron (hydr)oxide), the amorphous iron (hydr) oxide was chosen as remedial agent because it showed the highest selenium adsorption capability. Several levels of soil contamination with selenite and selenate either alone or in combination were prepared with a range of 10.9 to 155.6 mg Se kg<SUP>-1</SUP>. The amorphous iron (hydr) oxide showed a significant immobilizing effect on all selenite, selenate and mixed contaminated soils, and successfully suppressed the amount of soluble selenium below to the drinking water standard (10μg L<SUP>-1</SUP>, WHO). Appropriate application rates of the amorphous iron (hydr) oxide to soil were either around 1 or 2 % depending on soluble selenium content of the soils. Optimum conditions of water content and pH were 40 % and close to 4, respectively. Selenium fixation by applied amorphous iron (hydr) oxide in contaminated soil could be ascribed predominantly through adsorption reaction. Furthermore, the strong affinity of iron to selenium, and the large surface area of the amorphous iron (hydr) oxide are believed to contribute to the remarkable selenium fixation. The technique developed in this study can be also applied to selenium contaminated industrial waste and water.
- 社団法人 環境科学会の論文
社団法人 環境科学会 | 論文
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