【作者】 胡南； 丁德馨； 李广悦； 王永东； 李乐； 郑济芳；

【Author】 HU Nan,DING De-xin,LI Guang-yue, WANG Yong-dong,LI Le,ZHENG Ji-fang (Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy,University of South China,Hengyang of Hunan Prov.421001,China)

【机构】 南华大学铀矿冶生物技术国防重点学科实验室；

【摘要】 采用水培实验,研究了浮叶植物野生水葫芦(Eichhornia crassipes)、漂浮植物浮萍(Lemna minor L)、满江红(Azolla imbircata)、沉水植物菹草(Potamogeton crispus)、挺水植物空心莲子草(Alligator Alternanthera Herb)在初始铀浓度为0.15、1.50和15.00 mg·L~1的水中的生长状况及它们对水中铀的去除能力。结果表明,在21 d的水培试验期内,满江红对铀表现出了最强的抗性,0.15、1.50和15.00 mg·L~1的铀对满江红的生长抑制率分别只有4.56%、2.48%和6.79%,而满江红对水中铀的去除率分别达到了94%、97%和92%。进一步的试验表明,每1 L水中种植7.5 g满江红,可以获得最大的铀去除率,将初始铀浓度为1.25、2.50、5.00和10.00 mg·L~1的水中的铀浓度降至国家排放标准GB 23727-2009规定的0.05 mg·L~1以下分别需要17 d、19 d、23 d和25 d。研究结果为进一步开展铀污染水体植物修复的研究打下了基础。更多还原

【Abstract】 Hydroponic solution culture experiments were conducted on the growth of Eichhornia crassipes,Lemna minor L,Azolla imbircata,Potamogeton crispus,and Alligator alternanthera Herb in water with 0.15,1.50 and 15.00 mg ? L~1 concentrations of uranium,and on the uranium removal from the water by the aquatic plants.For the 21 days of hydroponic solution culture experiments,Azolla imbircata exhibited the strongest resistance to uranium and its growth inhibition rates induced by the water with 0.15,1.50 and 15.00 mg ? L~1 concentrations of uranium were 4.56%,2.48%,6.79%,respectively,and the uranium removal rates from the water by the plant amounted to 94%, 97%and 92%,respectively.Further experiments revealed that the most uranium removal could be achieved when 7.5 g Azolla imbircata was grown in 1 L of water,and the time required for the plant to reduce the uranium concentration in water with 1.25,2.50,5.00 and 10.00 mg ? L~1 concentrations of uranium below that stipulated in the national emission standards of China were 17,19,23 and 25 days,respectively.The results have laid foundation for further studies of phytoremediation of uranium contaminated water.更多还原