Enhancement of repeated applications of chelates on phytoremediation of uranium contaminated soil by Macleaya cordata.
作者：
Hu, Nan;Lang, Tao;Ding, Dexin*;Hu, Jingsong;Li, Changwu;...
期刊：
Journal of Environmental Radioactivity,2019年199-200:58-65 ISSN：0265-931X
通讯作者：
Ding, Dexin
作者机构：
[Ding, Dexin; Zhang, Hui; Li, Changwu; Li, Guangyue; Hu, Nan; Hu, Jingsong] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, 28 West Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.;[Lang, Tao] Jiangxi Nucl Ind Geol Bur, Brigade 264, Ganzhou 341000, Jiangxi, Peoples R China.
通讯机构：
[Ding, Dexin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, 28 West Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.
关键词：
Antioxidants;Bioaccumulation;Biochemistry;Bioremediation;Chelation;Contamination;Enzymes;Oxalic acid;Plants (botany);Soil moisture;Soil pollution control;Uranium;Antioxidant enzyme;Bio-concentration factors;Bioaccumulation factor;Chelates;Environmentally friendly alternatives;Hyperaccumulating plant;Macleaya cordata;Phytoremediation;Soil pollution;ascorbate peroxidase;catalase;chelate;citric acid;ethylenediamine;ethylenediamine disuccinic acid;oxalic acid;peroxidase;superoxide dismutase;transfer factor;unclassified drug;uranium;chelating agent;uranium;antioxidant;bioaccumulation;chelate;citric acid;concentration (composition);herb;hyperaccumulation;phytoremediation;soil pollution;solubilization;uranium;Article;bioaccumulation;biomass;concentration (parameter);controlled study;enzyme activity;greenhouse;leaf tissue;Macleaya cordata;oxidative stress;phytoavailability;phytoremediation;phytotoxicity;plant cell;shoot growth;soil acidity;soil pollution;solubilization;Viridiplantae;bioremediation;chemistry;metabolism;Papaveraceae;physiology;soil pollutant;Macleaya cordata;Biodegradation, Environmental;Chelating Agents;Papaveraceae;Soil Pollutants, Radioactive;Uranium
摘要：
A greenhouse pot experiment was performed to investigate the enhancement of repeated applications of citric acid (CA), ethylenediamine disuccinic acid (EDDS), and Oxalic acid (OA) on phytoremediation of uranium (U) contaminated soil by Macleaya Cordata. The chelates followed the order CA > EDDS > OA in terms of the enhancement on uranium uptake by M. cordata. The repeated applications of the chelates were found to be more effective than the one time application at the equal dose as the U concentration of soil solution increased significantly from the 8th to 14th day. The repeated applications of 10 mmol kg -1 CA promoted the solubilization of U in the U-contaminated soil by significantly decreasing the pH of soil solution, achieved the maximum U concentration of soil solution (1463.6 µg L −1 ), bioconcentration factors (BCFs, 11.4), bioaccumulation factors (BAFs, 21.4) and transfer factors (TFs, 1.9), which were 215.2, 5.7, 30.6 and 16.3 times as compared with the control group, respectively. The three applied chelates significantly affected the activities of the antioxidant enzymes in the leaves. Repeated applications of CA further enhanced the activities of the antioxidant enzymes in the leaves of M. cordata as compared with the control, EDDS and OA, mitigated the oxidative stress induced by uranium and chelates, and maximized the enhancement on the uranium uptake, which will be beneficial for the enhancement on the phytoremediation of uranium contaminated soil by U hyperaccumulating plants. These results indicated that the phytoavailability of uranium in soil solution as well as the accumulation of U by M. cordata were both significantly increased after repeated applications of CA, and that the repeated applications of 10 mmol kg -1 CA increased the activities of the antioxidant enzymes and promoted U accumulation by M. cordata. The study provided an environmentally friendly alternative for the enhancement on the phytoremediation of uranium contaminated soil using M. cordata. © 2018 Elsevier Ltd
语种：
英文
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Prediction model of uranium concentration for in-situ leaching pregnant solution based on uranium chemical fractions of ores
作者：
Li, Chunguang;Tan, Kaixuan*;Liu, Zhenzhong;Xia, Liangshu;Tan, Wanyu;...
期刊：
Journal of Radioanalytical and Nuclear Chemistry,2018年318(2):1379-1387 ISSN：0236-5731
通讯作者：
Tan, Kaixuan
作者机构：
[Chen, Liang; Tan, Wanyu; Tan, Kaixuan; Li, Chunguang] Univ South China, Sch Nucl Resources Engn, 28 Changsheng West Rd, Hengyang 421001, Peoples R China.;[Li, Chunguang] RMIT Univ, Sch Engn, 124 La Trobe St, Melbourne, Vic 3001, Australia.;[Liu, Zhenzhong] Univ South China, Sch Environm Protect & Safety Engn, 28 Changsheng West Rd, Hengyang 421001, Peoples R China.;[Xia, Liangshu] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Tan, Kaixuan] U;Univ South China, Sch Nucl Resources Engn, 28 Changsheng West Rd, Hengyang 421001, Peoples R China.
关键词：
uranium;Article;chemical composition;chemical reaction kinetics;concentration (parameters);controlled study;fractionation;leaching;oxidation;prediction;rock;soil acidification;uranium mine
摘要：
Based on the uranium chemical fractions, combined with laboratory experiments and field monitoring data, a prediction model of uranium concentration for in situ leaching pregnant solution was established. It was demonstrated that the kinetics of in situ leaching of uranium is affected by four chemical fractions from exchangeable to oxidizable after the acidification stage, meanwhile the variation of uranium concentration with time displays two trends as high → low and low → high → low, moreover, it is basically consistent with the fourth-order polynomial relationship. The prediction model equation is yi,x= aix4+ bix3+ cix2+ dix + ei, among which the parameters can be obtained by the regression of uranium chemical fractions of ores. © 2018, Akadémiai Kiadó, Budapest, Hungary.
语种：
英文
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A novel method using a complex surfactant for in-situ leaching of low permeable sandstone uranium deposits
作者：
Tan, Kaixuan*;Li, Chunguang;Liu, Jiang;Qu, Huiqiong;Xia, Liangshu;...
期刊：
Hydrometallurgy,2014年150:99-106 ISSN：0304-386X
通讯作者：
Tan, Kaixuan
作者机构：
[Qu, Huiqiong; Li, Yongmei; Liu, Jiang; Tan, Kaixuan; Hu, Yang; Li, Chunguang; Xia, Liangshu] Univ South China, Sch Nucl Resources Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Tan, Kaixuan] U;Univ South China, Sch Nucl Resources Engn, Hengyang 421001, Peoples R China.
关键词：
Complex surfactant;Leaching kinetics;Resin adsorption and elution;Low permeable sandstone uranium deposit;In-situ leaching of uranium mining
摘要：
Applications of a complex surfactant developed in-house to in-situ leaching of lowpermeable sandstone uraniumdeposits are described based on results from agitation leaching, column leaching, resin adsorption, and elutionexperiments using uranium containing solution from the in-situ leaching site. The results of agitation leachingexperiments show that adding surfactant with different concentrations into leaching solution improves theleaching rate of uranium. The maximum leaching rate of uranium from agitation leaching reached 92.6% at anadded surfactant concentration of 10 mg/l. Result of column leaching experiment shows that adding surfactantwith varying concentrations into leaching solutions increased the permeability coefficient of ore-bearing layerby 42.786.8%. The leaching rate of uranium from column leaching increased by 58.0% and reached 85.8%. Theresult of kinetic analysis shows that for the extraction of uranium controlled by diffusion without surfactantthe apparent rate constant 0.0023/d changed to 0.0077/d for the extraction with surfactant controlled by bothdiffusion and surface chemical reactions. Results from resin adsorption and elution experiments show thatthere was no influence on resin adsorption and elution of uraniumwith an addition of 50 mg/l surfactant to productionsolution from in-situ leaching. The adsorption curve, sorption capacity of resin, recycling of resinremained the same as without adding any surfactant. Introducing complex surfactant to leaching solutionincreased the peak concentration of uranium in eluents, reduced the residual uranium content in resin, andpromoted the elution efficiency. The method of using a complex surfactant for in-situ leaching is useful for lowpermeable sandstone uranium deposits. © 2014 Elsevier B.V. All rights reserved.
语种：
英文
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The Effects of Structural Characteristics of Low Seepage Sandstone Uranium Ore Rock on Permeability
作者：
Zeng, Sheng*;Tan, Kaixuan;Du, Xueming;Li, Chunguang
期刊：
Advanced Materials Research,2012年524-527:371-374 ISSN：1022-6680
通讯作者：
Zeng, Sheng
作者机构：
[Zeng, Sheng] Univ S China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Tan, Kaixuan; Du, Xueming; Li, Chunguang] Univ S China, Sch Nucl Resources & Nucl Fuel Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Zeng, Sheng] U;Univ S China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.
会议名称：
International Conference on Energy and Environmental Protection (ICEEP)
会议时间：
2012-06-23
会议地点：
Hohhot, China
会议主办单位：
[Zeng, Sheng] Univ S China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.^[Tan, Kaixuan;Du, Xueming;Li, Chunguang] Univ S China, Sch Nucl Resources & Nucl Fuel Engn, Hengyang 421001, Peoples R China.
会议论文集名称：
Natural Resources and Sustainable Development II. Part 1
关键词：
Fractal dimensionthe;Low seepage sandstone uranium ore rock;Permeability;Structure characteristics
摘要：
It is great important for the development of China's uranium mining to efficiently extract low seepage sandstone uranium ore rock. It is the objective of this paper to present the effects of the structural characteristics of the low seepage sandstone uranium ore rock on permeability. Samples of sandstone from a uranium mine in XinJiang province were used to carry out experimental research on permeability. These tests were carried out on ore rock with particle size and distribution characteristics determined by a homemade permeability test device. The research indicates that the sandstone uranium deposits may be classified as low seepage because the particle size falls within the range 0.1∼1.6mm, that the distribution of particle sizes observed conforms to low seepage fractal characteristics, the permeability decreases when the value of the ore particle size distribution of fractal dimensions increases, and the permeability decreases with particle size decreasing, and that the decrease of the permeability is not a linear change, but is an obviously exponentially decreasing functional relationship. ©(2012) Trans Tech Publications.
语种：
英文
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