Eapen Susan, Singh Shraddha, Thorat Vidya, Kaushik C P, Raj Kanwar, D'Souza S F
Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
Chemosphere. 2006 Dec;65(11):2071-3. doi: 10.1016/j.chemosphere.2006.06.049. Epub 2006 Jul 28.
Potential of plants to remove radionuclides/toxic elements from soils and solutions can be successfully applied for removal of important radionuclides such as strontium-90 ((90)Sr) and cesium-137 ((137)Cs). When uptake of (137)Cs and (90)Sr by Calotropis gigantea plants incubated in distilled water spiked with the radionuclides either alone or in combination was studied, it was found to have a high efficiency for the removal of (90)Sr, with 90% being removed from solutions (5 x 10(3)kBql(-1)) within 24h of incubation. However, in case of (137)Cs, about 44% could be removed from solutions (5 x 10(3)kBql(-1)) at the end of 168h of incubation. Accumulation of (90)Sr and (137)Cs was higher in roots compared to shoots. The plants could remediate both (90)Sr and (137)Cs when they were added together to the solution. When two months old plants were incubated in low level nuclear waste, 99% of activity disappeared at the end of 15 days. The present study suggests that C. gigantea could be used as a potential candidate plant for phytoremediation of (90)Sr and (137)Cs.
植物从土壤和溶液中去除放射性核素/有毒元素的潜力可成功应用于去除重要的放射性核素，如锶-90（90Sr）和铯-137（137Cs）。当研究在添加了放射性核素（单独或组合添加）的蒸馏水中培养的牛角瓜植物对137Cs和90Sr的吸收情况时，发现其对90Sr的去除效率很高，在培养24小时内可从溶液（5×10³Bq l⁻¹）中去除90%。然而，对于137Cs，在培养168小时结束时，约44%可从溶液（5×10³Bq l⁻¹）中去除。与地上部分相比，90Sr和137Cs在根部的积累更高。当将90Sr和137Cs一起添加到溶液中时，植物能够对两者进行修复。当两个月大的植物在低水平核废料中培养时，15天后99%的放射性消失。本研究表明，牛角瓜可作为一种潜在的候选植物用于对90Sr和137Cs的植物修复。
