Uranium Accumulation of Crop Plants Enhanced by Citric Acid |
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| Authors: | Peichun Chang Kyoung-Woong Kim Satoshi Yoshida Soo-Young Kim |
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| Institution: | (1) UNU&GIST Joint Programme on Science and Technology for Sustainability, International Environmental Research Center, Gwangju, 500-712, South Korea;(2) Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 500-712, South Korea;(3) Environmental and Toxicological Sciences Research Group, National Institute of Radiological Sciences, Anagawa 4-9-1, Inage-ku, Chiba-shi Chiba, 263-8555, Japan;(4) Kumho Life & Environmental Science Laboratory, Gwangju, 500-712, South Korea |
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| Abstract: | Citric acid was applied to soil to enhance U accumulation in four crop plants. While the highest enhanced U accumulation of
aboveground tissues (a.c. 2000 mg kg−1 dry weight) occurred in the leaves of Indian mustard (Brassica juncea), the highest enhanced U accumulation of roots (a.c. 3500 mg kg−1 dry weight) occurred in canola (Brassica napus var. napus). Uranium translocation among tissues of test plants is in the relation of roots>shoots ≅ leaves. The flowers of sunflower
(Helianthus annuus) contained similar or higher U concentrations than those found in shoots, but concentrations in seeds are close to zero.
In conclusion, Indian mustard is recommended as a potential species for phytoextraction for U-contaminated soil due to its
high U accumulation of aboveground biomass (a.c. 2200 μg per plant). There is no evidence that two types of soils cause a
significant difference of the enhanced U accumulation (p<0.05). Results, however, indicate that additional citric acid may result in downward U migration that may contaminate groundwater.
Speciation of U that is taken up by plants is also discussed in the end. |
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| Keywords: | amendment citric acid hyperaccumulation Indian mustard phytoremediation uranium |
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