Enhancement of Uranium Mobility by Manure Amended in a Calcareous Soil: A Potential Use of Organic Fertilizer for Phytoremediation
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概要
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Understanding of uranium (U) mobility when a soil amendment is applied for the phytoremediation purposes is important for minimizing U migration in the soil profile. The objective of this study was to evaluate the effect of cattle manure amendment on U solubility and mobility in the soil profile. A 40 cm soil column was filled with calcareous U-contaminated soils to demonstrate uranium behavior under irrigated conditions. Experimental treatments were no amendment (control) and steer manure amendment with 118 m<I>l</I>water irrigated every 48 hours for 200 days. Uranium mobility was enhanced through the columns 23 days after the addition of manure when the U concentration of leachate reached about 200 mg<I>l</I><SUP>-1</SUP>Leachate U concentration of the control increased up to 27.6 mg<I>l</I><SUP>-1</SUP>. The amount of total U leaching relative to the U initially contained in the soil was 1.2% for the control and 6.1% for manure treatment during the study period. Electrical conductivity of leachate was more positively correlated to U concentration for the manure-amended column (γ=0.47) than the control (γ=0. 24), attesting the occurrence of cation exchange processes between the soil solid and solution phases. Because leachate pH was still in a neutral range after the manure addition, U desorption from soil to solution is unlikely to occur, indicating that U mobility could mostly result from U chelation with humic substances contained in the manure.
- 日本環境化学会の論文
日本環境化学会 | 論文
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