Influence of Uranium Speciation on Plant Uptake
Firstly, in order to confirm the proportions of different species of uranium in solutions at different pH levels, carbonate and phosphate concentrations were calculated through Visual MINTEQ 3.1 software. Then, based on the calculation results, solutions with different species of uranium were prepared. Finally, the accumulation behavior of different species of uranium by Azolla-Anabaena was studied through hydroponic experiments. The results show that the growth inhibition rates on Azolla-Anabaena by these species of uranium were significantly different. UO22+, UO2(OH)3−, UO2(CO3)34−, and (UO2)3(OH)5+ species inhibited its growth, but UO2PO4− promoted its growth. The bioaccumulation amounts of these species of uranium by Azolla-Anabaena were significantly different, too. In order to increase the bioaccumulation amounts of uranium by Azolla-Anabaena, the main species of uranium in solution should be regulated to UO22+ or (UO2)3(OH)5+, and the concentrations of carbonate and phosphate in the medium should be reduced.
KeywordsPhytoremediation Uranium Speciation Bioaccumulation
This work was supported by the National Natural Science Foundation of China (U1401231, 11305087), the Program of Science and Technology Department of Hunan Province (2016SK2041, 2017RS3050, 2018JJ3445), and the Program of Scientific Research Foundation of Education Department of Hunan Province (14B150).
- Bertin C, Yang X, Weston LA (2003) The role of root exudates and allelochemicals in the rhizosphere. Plant Soil 256:67–83Google Scholar
- Chen J (2003) Study on Azolla productivity and its relation to the change of several nutrients in different liquid media. Plant Nut Fert Sci 9:467–472. (In Chinese)Google Scholar
- Gustafsson JP (2006) Visual minteq. Capturado em de 26Google Scholar
- Hu N, Ding DX, Li GY, Wang YD, Li L, Zheng JF (2012) Uranium removal from water by five aquatic plants. Acta Scient Circumst 32:1637–1645. (In Chinese)Google Scholar
- Huang G, Guo G, Yao S, Zhang N, Hu H (2016) Organic acids, amino acids compositions in the root exudates and Cu-accumulation in castor (Ricinus communis L.) under Cu stress. Int J Phytorem 18:33–40Google Scholar
- Misson J, Henner P, Morello M, Floriani M, Wu TD, Guerquinkern JL, Février L (2009) Use of phosphate to avoid uranium toxicity in Arabidopsis thaliana leads to alterations of morphological and physiological responses regulated by phosphate availability. Environ Exp Bot 67:353–362CrossRefGoogle Scholar
- Nakajima A, Horikoshi T, Sakaguchi T (1979) Ion effects on the uptake of uranium by Chlorella regularis. Agric Biol Chem 43:625–629Google Scholar
- Pratas J, Favas PJ, Paulo C, Rodrigues N, Prasad MNV (2012) Uranium accumulation by aquatic plants from uranium-contaminated water in central Portugal. Int J Phytorem 14:221–234Google Scholar
- Ragnarsdottir KV, Charlet L (2000) Uranium behaviour in natural environments. In: Cotter-Howells JD, Campbell LS, Valsami-Jones E, Batchelder M (eds) Environmental mineralogy: microbial interactions, anthropogenic influences, contaminated land and waste management. Mineralogical Society, UK, pp 245–289Google Scholar
- Rai PK (2008) Technical Note: Phytoremediation of Hg and Cd from industrial effluents using an aquatic free floating Macrophyte Azolla Pinnata. Int J Phytorem 10:430–439Google Scholar
- Tang LF, Huang YB, Weng BQ, Liu ZZ, Liu XS (2000) Sustainable agricultural model of high output, low input and less pollution in Paddy field. Scient Agricul Sin 33:60–66. (In Chinese).Google Scholar