Fractionations of rare earth elements in plants and their conceptive model

被引:30
作者
Ding ShiMing
Liang Tao [1 ]
Yan JunCai
Zhang ZiLi
Huang ZeChun
Xie YaNing
机构
[1] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
[2] Chinese Acad Sci, Nanjing Inst Geog & Limnol, Nanjing 210008, Peoples R China
[3] Anhui Agr Univ, Hefei 230036, Peoples R China
[4] Chinese Acad Sci, State Key Lab Synchrotron Radiat, Inst High Energy Phys, Beijing 100039, Peoples R China
来源
SCIENCE IN CHINA SERIES C-LIFE SCIENCES | 2007年 / 50卷 / 01期
关键词
rare earth elements (REEs); fractionation; tetrad effect; plant accumulation; X-ray absorption spectroscopy (XAS); nanometer-sized TiO2;
D O I
10.1007/s11427-007-2040-7
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Fractionations of rare earth elements (REEs) and their mechanisms in soybean were studied through application of exogenous mixed REEs under hydroponic conditions. Significant enrichment of middle REEs (MREEs) and heavy REEs (HREEs) was observed in plant roots and leaves respectively, with slight fractionation between light REEs (LREEs) and HREEs in stems. Moreover, the tetrad effect was observed in these organs. Investigations into REE speciation in roots and in the xylem sap using X-ray absorption spectroscopy (XAS) and nanometer-sized TiO2 adsorption techniques, associated with other controlled experiments, demonstrated that REE fractionations should be dominated by fixation mechanism in roots caused by cell wall absorption and phosphate precipitation, and by the combined effects of fixation mechanism and transport mechanism in aboveground parts caused by solution complexation by intrinsic organic ligands. A conceptive model was established for REE fractionations in plants based on the above studies.
引用
收藏
页码:47 / 55
页数:9
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