Abstract
In this study, the effects of the complexing agent ethylenediamine tetraacetic acid (EDTA) on the species of Rare Earth Elements (REE) Lanthanum, Gadolinium and Yttrium in nutrient solution and bioaccumulation of REEs in rice seedling were investigated. The results showed that addition of EDTA can reduce the bioaccumulation values in the rice root, on the other hand, the bioaccumulation values in the aboveground parts (stem and leaves) increased. Considering the different parts of rice, root had higher bioaccumulation ability than that in aboveground parts of rice. During the experimental concentration range, for different species REEs, the bioaccumulation processes on rice's root were almost controlled by adsorption and because of the effects of adding EDTA, ionic and complexed species REEs showed two different patterns during the bioaccumulation process. All these indicated that EDTA had strong effects on the bioavail‐abilities of REEs through controlling their species in nutrient solution.
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