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	Role of ligands in accumulation and fractionation of rare earth elements in plants - Examples of phosphate and citrate
	Liang T.
	2005
关键词	accumulation citrate fractionation ligand phosphate rare earth elements (REEs) wheat soil-grown plants organic-acids complexation behavior aqueous geochemistry inorganic complexes stability-constants carboxylic-acids natural-waters distributions rhizosphere
英文摘要	Few studies have been carried out on the effects of ligands on rare earth element (REE) bioaccumulation processes. In this study, the effects of phosphate (Pi, an inorganic ligand) and citrate (an organic ligand) on accumulation and fractionation of REEs in wheat were investigated using aqueous culture with extraneous mixed REEs (MRE). The results show that initial Pi solution culture at various levels followed by exposure to a fixed-MRE solution did not significantly change the total concentrations of REEs (FREE) in roots, whereas the FREE in leaves dramatically decreased with increasing levels of Pi applied. Simultaneous culture of wheat with mixture of MRE and citrate solutions caused obvious decreases of the FREE in both roots and leaves. Compared with MRE, significant fractionations of -REEs were found in wheat organs when no ligand was applied. Notable middle REE (MREE) enrichment and M-type tetrad effect were observed in the roots, and heavy REE (HREE) enrichment and W-type tetrad effect existed in the leaves. Pi treatments did not significantly affect the fractionations of REEs in the roots, but enrichment of HREEs in the leaves slightly increased at the highest level of Pi applied. Fractionations of REEs in both roots and leaves decreased with increasing levels of citrate applied; at higher levels of citrate (>= 150 M), no above fractionation features were observed in wheat, but light REE (LREE) enrichment existed in the roots and leaves. The results indicate that ligands might play important roles in accumulation and fractionation of REEs during bioaccumulation processes.
出处	Biological Trace Element Research
卷	107
期	1
页	73-86
收录类别	SCI
语种	英语
ISSN号	0163-4984
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/24128]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Liang T.. Role of ligands in accumulation and fractionation of rare earth elements in plants - Examples of phosphate and citrate. 2005.

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