引用本文:稂涛,胡南,张辉,李广悦,王永东,丁德馨,等.博落回对不同化学形态铀的富集特征[J].环境科学研究,2017,30(8):1238-1245.
LANG Tao,HU Nan,ZHANG Hui,LI Guangyue,WANG Yongdong,DING Dexin,et al.Accumulation of Different Chemical Species of Uranium in Macleaya cordata[J].Reserrch of Environmental Science,2017,30(8):1238-1245.]
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博落回对不同化学形态铀的富集特征
稂 涛1,2, 胡 南1,2, 张 辉1,2, 李广悦1,2, 王永东1,2, 丁德馨1,2
1.南华大学, 铀矿冶生物技术国防重点学科实验室, 湖南 衡阳 421001 ;2.南华大学, 极贫铀资源绿色开发技术湖南省重点实验室, 湖南 衡阳 421001
摘要:
为了研究陆生植物博落回(Macleaya Cordata)对不同化学形态铀的富集特征,采用Visual MINTEQ地球化学平衡软件设计了五种含不同化学形态铀〔UO22+、CaUO2(CO3)32-、UO2Cit-、(UO2)2(EDTA)24-和UO2HPO4〕的培养液,开展水培试验. 博落回在这五种培养液中分别培养1、5、10、15、20和25 d后,测定其株高、根长和干质量,并用电感耦合等离子体质谱仪(ICP-MS)测定其地上部分和根部的w(铀). 结果表明:在不同化学形态铀胁迫下,博落回株高无显著差异,UO2HPO4可促进博落回根的生长,而(UO2)2(EDTA)24-降低了博落回的干质量. 并且,博落回根部对不同化学形态铀的富集能力大小顺序为UO22+>UO2HPO4>CaUO2(CO3)32->UO2Cit->(UO2)2(EDTA)24-,博落回地上部分对不同化学形态铀的富集能力大小顺序为UO2Cit->(UO2)2(EDTA)24->UO22+>CaUO2(CO3)32->UO2HPO4. 此外,博落回根部对UO22+的富集能力很高,但地上部分很低. 添加柠檬酸,培养液中铀的主要化学形态为UO2Cit-,并且在100 mg/L铀的胁迫下,博落回对UO2Cit-的生物富集系数和转移系数分别达到0.09和8.53. 因此,要提高博落回对铀污染土壤中铀的富集和转移,可添加柠檬酸,促使土壤中铀的形态以UO2Cit-为主,同时要降低土壤中碳酸盐和磷酸盐的含量.
关键词:  博落回  铀的化学形态  水培试验  富集特征  转移
DOI:
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基金项目:国家自然科学基金重点项目(U1401231);湖南省科技厅重点项目(2016Sk2041);湖南省教育厅优秀青年项目(14B150)
Accumulation of Different Chemical Species of Uranium in Macleaya cordata
LANG Tao1,2, HU Nan1,2, ZHANG Hui1,2, LI Guangyue1,2, WANG Yongdong1,2, DING Dexin1,2
1.Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China ;2.Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources, Hengyang 421001, China
Abstract:
Abstract: In order to investigate the accumulation of different chemical species of uranium (U) in Macleaya cordata, the geochemical equilibrium software Visual MINTEQ was used to design five nutrient solutions containing UO22+, CaUO2(CO3)32-, UO2Cit-, (UO2)2(EDTA)24- and UO2HPO4, respectively, and hydroponic experiments on M.cordata were conducted in the nutrient solutions. The shoot heights, root lengths and dry weights of M.cordata were measured after it was cultured in the nutrient solutions for 1,5, 10,5, 20 and 25 days, respectively, and the U contents in its shoots and roots were analyzed by inductively coupled plasma mass spectrometry (ICP-MS). The results showed that the chemical species of U did not have significant effects on the shoot height of M. cordata; UO2HPO4 promoted its root growth, and (UO2)2(EDTA)24- decreased its dry weight. The accumulation of different chemical species of U inthe roots of M. cordata followed the order of UO2+ 2> UO2HPO4 > CaUO2(CO3)32- > UO2Cit- > (UO2)2(EDTA)24-, and that in the shoots of M. cordata followed the order of UO2Cit-> (UO2)2(EDTA)4-2> UO2+ 2> CaUO2(CO3)32- > UO2HPO4. Besides, the accumulation of UO22+ in the roots of M. cordata was relatively high, but that in the shoots of M.cordata was relatively low. After application of citric acid, UO2Cit- was the main chemical species of U in the nutrient solution. and the bioaccumulation factor and transfer factor of M.cordata for UO2Cit- reached 0.09 and 8.53 after exposure to 100 mg/L U, respectively. Therefore, the accumulation and translocation of uranium from uranium contaminated soil by M. cordata can be increased by applying citric acid, which helps regulate the main species of uranium in soil to UO2Cit-, and decrease the concentrations of carbonate and phosphate in soil.
Key words:  Macleaya cordata  chemical species of uranium  hydroponic experiment  accumulation  translocation