期刊
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
卷 27, 期 5-6, 页码 529-538出版社
SPRINGER
DOI: 10.1007/s10653-005-8013-5
关键词
amendment; citric acid; hyperaccumulation; Indian mustard; phytoremediation; uranium
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) stop dry weight) occurred in the leaves of Indian mustard (Brassica juncea), the highest enhanced U accumulation of roots (a.c. 3500 mg kg(-1) stop dry weight) occurred in canola (Brassica napus var. napus). Uranium translocation among tissues of test plants is in the relation of roots > shoots equivalent to 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 mu g 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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