Screening of Potential Phytoremediation Plants for Uranium-contaminated Soils: A Sand Culture Method and Metal-removal Model

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  • HASHIMOTO Yohei
    Department of Soil Science, North Carolina State University
  • BOYSE Lester G.
    Department of Agronomy and Horticulture, New Mexico State University
  • ULERY April L.
    Department of Agronomy and Horticulture, New Mexico State University
  • TAJIMA Kiyoshi
    Department of Bioproduction and Environmental Engineering, Tokyo University of Agriculture

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Other Title
  • 珪砂栽培法による植物のウラン吸収特性試験―Ｐｈｙｔｏｒｅｍｅｄｉａｔｉｏｎ植物の選定―
  • ケイシャ サイバイホウ ニ ヨル ショクブツ ノ ウラン キュウシュウ トクセイ シケン Phytoremediation ショクブツ ノ センテイ
  • A Sand Culture Method and Metal-removal Model
  • ―Phytoremediation植物の選定―

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Using appropriate plants that are highly capable of accumulating uranium (U) is required for the success in phytoremediation of U-contaminated soil. The objectives of this study were to screen plants capable of U accumulation in the aboveground plant tissue and to find the trend of U accumulation among the plant families by using a sand culture method. In a laboratory setting with grow lights, each plant species was grown in 3 cm of sterilized silica sand that was amended with the nutrient solution. Four days before the plant harvest, the sand was treated with 50 mg Ul-1solution including a U weathering product dissolved in citric acid. A total of 32 plant species from 5 families were screened and found to accumulate from 4 to 416 mg of U per kg dry tissue weight. Plant species inChenopodiaceaeandFabaceaehad the highest mean U concentrations while plants inPoaceaeaccumulated less U than the dicotyledonous plants tested. Based on the result of sand culture screening, the plants for phytoremediation of U-contaminated soils could be selected by using a mathematical model related to plant characteristics (e.g. biomass and planting density) to predict a long-term U-removal rate from the soil.

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