Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India.
Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India.
J Environ Manage. 2016 Feb 1;167:124-9. doi: 10.1016/j.jenvman.2015.11.018. Epub 2015 Nov 28.
The present study evaluated uranium (U) removal ability and tolerance to low level nuclear waste (LLNW) of an aquatic weed Hydrilla verticillata. Plants were screened for growth in 10%-50% waste treatments up to 3 d. Treatments of 20% and 50% waste imposed increasing toxicity with duration assessed in terms of change in fresh weight and in the levels of photosynthetic pigments and thiobarbituric acid-reactive substances. U concentration, however, did not show a progressive increase and was about 42 μg g(-1) dw from 20% to 50% waste at 3 d. This suggested that a saturation stage was reached with respect to U removal due to increasing toxicity. However, in another experiment with 10% waste and 10% waste+10 ppm U treatments, plants showed an increase in U concentration with the maximum level approaching 426 μg g(-1) dw at 3 d without showing any toxicity as compared to that at 20% and 50% waste treatments. Hence, plants possessed significant potential to take up U and toxicity of LLNW limited their U removal ability. This implies that the use of Hydrilla plants for U removal from LLNW is feasible at low concentrations and would require repeated harvesting at short intervals.
本研究评估了水生杂草水蕴草去除铀 (U) 的能力和对低放核废物 (LLNW) 的耐受能力。将植物在 10%-50%的废物处理中进行了 3 天的生长筛选。用新鲜重量和光合色素及硫代巴比妥酸反应物质水平的变化来评估 20%和 50%废物处理的持续毒性。然而，U 浓度并没有随着时间的推移而持续增加，在 3 天的时间里，从 20%到 50%的废物中，U 浓度约为 42μg g(-1)dw。这表明由于毒性增加，U 的去除达到了饱和阶段。然而，在另一项 10%废物和 10%废物+10ppmU 处理的实验中，与 20%和 50%废物处理相比，植物在 3 天内 U 浓度增加，最大水平接近 426μg g(-1)dw，而没有表现出任何毒性。因此，植物具有吸收 U 的巨大潜力，而 LLNW 的毒性限制了其 U 去除能力。这意味着在低浓度下，利用水蕴草从 LLNW 中去除 U 是可行的，并且需要在短时间间隔内进行多次收获。
