Multitracer study on the uptake mechanism of yttrium and rare earth elements by autumn fern

2002 ◽  
Vol 90 (5) ◽  
Author(s):  
Takuo Ozaki ◽  
Shizuko Ambe ◽  
S. Enomoto ◽  
Y. Minai ◽  
S. Yoshida ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Plant Species ◽  
Ionic Radius ◽  
High Uptake ◽  
Uptake Mechanism ◽  
Chelating Reagents ◽  
Uptake Mechanisms

SummaryIrrespective of low bioavailability, some plant species accumulate Y and rare earth elements (REEs) to a great extent (accumulator species). The uptake mechanisms of Y and REEs were investigated for autumn fern, one of accumulator species. For comparison, plant species which accumulated poorly REEs (non-accumulator species) were also studied. In the present investigation, two noticeable phenomena were observed. (I) Autumn fern showed no ionic-radius dependence of Y-REE uptake by leaves, while non-accumulator species showed an extremely high uptake for Y compared with REEs. (II) Y-REE uptake by autumn fern was influenced by the addition of chelating reagents to the uptake solution, while no effect was observed for non-accumulator species.

scholarly journals Rare earth elements (REEs): Effects on germination and growth of selected crop and native plant species

Chemosphere ◽  
2014 ◽  
Vol 96 ◽  
pp. 57-66 ◽  
Author(s):  
Philippe J. Thomas ◽  
David Carpenter ◽  
Céline Boutin ◽  
Jane E. Allison
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Plant Species ◽  
Native Plant ◽  
Native Plant Species ◽  
Germination And Growth

Thermal Transformation in Anhydrous Rare Earth Acetates

1972 ◽  
Vol 50 (19) ◽  
pp. 3100-3103 ◽  
Author(s):  
G. Adachi ◽  
E. A. Secco
Keyword(s):  
Thermal Analysis ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Ionic Radius ◽  
Thermal Transformation ◽  
Entropy Change ◽  
Transformation Process ◽  
Enthalpy Change ◽  
Transformation Property ◽  
The Rare Earth

The thermal transformation in anhydrous acetates of Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y has been studied by thermal analysis. The enthalpy change, ΔH, and the entropy change, ΔS, accompanying the transformation process are reported and related to ionic radius of the rare earth element.The acetates of the rare earth elements, La, Pr, and Nd did not exhibit the thermal transformation property.

scholarly journals Phytoextraction of rare earth elements in herbaceous plant species growing close to roads

2017 ◽  
Vol 24 (16) ◽  
pp. 14091-14103 ◽  
Author(s):  
Patrycja Mikołajczak ◽  
Klaudia Borowiak ◽  
Przemysław Niedzielski
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Plant Species ◽  
Herbaceous Plant

scholarly journals Characterization of rare-earth doped Si3N4/SiC micro/nanocomposites

2010 ◽  
Vol 4 (1) ◽  
pp. 25-32 ◽  
Author(s):  
Peter Tatarko ◽  
Stefánia Lojanová ◽  
Ján Dusza ◽  
Pavol Sajgalík
Keyword(s):  
Fracture Toughness ◽  
Rare Earth ◽  
Silicon Nitride ◽  
Rare Earth Elements ◽  
Ionic Radius ◽  
Bending Strength ◽  
Rare Earth Oxide ◽  
Positive Influence ◽  
The Matrix

Influence of various rare-earth oxide additives (La2O3, Nd2O3, Sm2O3, Y2O3, Yb2O3 and Lu2O3) on the mechanical properties of hot-pressed silicon nitride and silicon nitride/silicon carbide micro/nano-composites has been investigated. The bimodal character of microstructures was observed in all studied materials where elongated ?-Si3N4 grains were embedded in the matrix of much finer Si3N4 grains. The fracture toughness values increased with decreasing ionic radius of rare-earth elements. The fracture toughness of composites was always lower than that of monoliths due to their finer Si3N4/SiC microstructures. Similarly, the hardness and bending strength values increased with decreasing ionic radius of rare-earth elements either in monoliths or composites. On the other hand, the positive influence of finer microstructure of the composites on strength was not observed due to the present defects in the form of SiC clusters and non-reacted carbon zones. Wear resistance at room temperature also increased with decreasing ionic radius of rare-earth element. Significantly improved creep resistance was observed in case either of composite materials or materials with smaller radius of RE3+. .

Screening of plants of different species and functional groups for phytomining of rare earth elements in soil

2020 ◽  
Author(s):  
Precious Okoroafor ◽  
Oliver Wiche
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Functional Groups ◽  
Plant Species ◽  
Festuca Arundinacea ◽  
Cannabis Sativa ◽  
Grass Species ◽  
Herbaceous Species ◽  
Screening Experiment ◽  
Available Information

<p>To significantly contribute to the available information on potentials of different plants species for use in phytomining of  Rare Earth Elements(REEs) , a screening experiment was conducted to directly compare at once 8 plant species belonging to two functional groups (herbs and grasses), grown on a soil with high  REEs concentrations. The plants were grown for 10 weeks on potted soils, each containing 2kg of soil.  The plants evaluated are <em>Fagopyrum esculentum, Cannabis sativa, Brassica napus</em> and <em>Sinapis alba</em> for the herbaceous species and <em>Sorghum bicolor, Zea mays, Avena sativa</em> and <em>Festuca arundinacea</em> for the grass species. Concentrations of the four REEs namely Cerium (Ce), Lanthanum (La), Neodymium (Nd) and Yttrium (Y) and amount/content of each REE contained in the species investigated were determined and the data obtained were subjected to the statistical analysis Multivariate Analysis of Variance to identify differences that exist between species, within and between functional groups. Results show that the differences observed in amount of each of the REEs phytomined by the different grass species are statistically insignificant. Contrastingly, significant differences exist between the concentrations and content of each of the REEs between the herbaceous species, with <em>F. esculentum</em> significantly showing higher potential for use in phytomining compared to the rest of the herbaceous species. Results from statistical comparison of all species shows that <em>F. esculentum</em> is the candidate that showed more potential for use in phytomining , with <em>C. sativa</em> also being the next  specie with high potential for phytomining aside from <em>F.esculentum</em>  when compared to the rest of the species investigated. Functional groups were compared, and results showed that the herbaceous specie have a significantly higher potential for use in phytomining of REEs compared to grass species. Results from this experiment contributes to existing knowledge on potentials of different plant species for use in phytomining and suggest possible candidates in comparison to others, for use in experiments that seek to improve the chances of using plants as an eco-friendly alternative to conventional mining of rare earth elements in commercial quantities.</p>

Possible sources of rare earth elements near different classes of road in Poland and their phytoextraction to herbaceous plant species

2021 ◽  
Vol 193 ◽  
pp. 110580
Author(s):  
Patrycja Mleczek ◽  
Klaudia Borowiak ◽  
Anna Budka ◽  
Małgorzata Szostek ◽  
Przemysław Niedzielski
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Plant Species ◽  
Herbaceous Plant
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