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Uranium accumulation in aquatic macrophytes in an uraniferous region: Relevance to natural attenuation
Published in Elsevier Ltd
Volume: 156
Pages: 76 - 87
Phytoremediation potential of uranium (U) was investigated by submerged, free-floating and rooted emergent native aquatic macrophytes inhabiting along the streams of Horta da Vilariça, a uraniferous geochemical region of NE Portugal. The work has been undertaken with the following objectives: (i) to relate the U concentrations in water-sediment-plant system; and (ii) to identify the potentialities of aquatic plants to remediate U-contaminated waters based on accumulation pattern. A total of 25 plant species culminating 233 samples was collected from 15 study points along with surface water and contiguous sediments. Concentrations of U showed wide range of variations both in waters (0.61-5.56 μg L-1, mean value 1.98 μg L-1) and sediments (124-23,910 μg kg-1, mean value 3929 μg kg-1) and this is also reflected in plant species examined. The plant species exhibited the ability to accumulate U several orders of magnitude higher than the surrounding water. Maximum U concentrations was recorded in the bryophyte Scorpiurium deflexifolium (49,639 μg kg-1) followed by Fontinalis antipyretica (35,771 μg kg-1), shoots of Rorippa sylvestris (33,837 μg kg-1), roots of Oenanthe crocata (17,807 μg kg-1) as well as in Nasturtium officinale (10,995 μg kg-1). Scorpiurium deflexifolium displayed a high bioconcentration factor (BF) of ~2.5 × 104 (mean value). The species Fontinalis antipyretica, Nasturtium officinale (roots) and Rorippa sylvestris (shoots) exhibited the mean BFs of 1.7 × 104, 5 × 103 and 4.8 × 103 respectively. Maximum translocation factor (TF) was very much pronounced in the rooted perennial herb Rorippa sylvestris showing extreme ability to transport U for the shoots and seems to be promising candidate to be used as bioindicator species. © 2016 Elsevier Ltd.
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PublisherData powered by TypesetElsevier Ltd