Rare earth elements associated with pedogenic iron oxides in humid and tropical soils from different parent materials

Wu, Cho-Yin; Chu, Mei Fei; Huang, Kuo-Fang; Chen, Hsin-Yu

doi:10.1016/j.geoderma.2022.115966

Cited by 12 publications

(5 citation statements)

References 38 publications

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“…Total REE concentrations in soil do not necessarily reflect REE mobility and availability to plants [65][66][67]. Hence, many different chemical procedures have been proposed in the literature that aim to predict the chemical speciation, mobility, and plant availability of REE in soils [65,66,[68][69][70].…”

Section: Sequential Leaching Methods To Evaluate the Mobility And Pla...mentioning

confidence: 99%

“…Despite relatively high levels of total REE, 60-90% appeared in the residual fraction, and the REE contents in oxidizable compounds formed the second most important REE pool in 6 out of 8 samples. Using citrate-dithionite-bicarbonate as an extractant, it was possible to elucidate variations in REE bound to Fe-oxyhydroxides across different pedons in highly weathered tropical soils [67].…”

Section: Sequential Leaching Methods To Evaluate the Mobility And Pla...mentioning

confidence: 99%

“…The mobilized REE either co-precipitate in secondary minerals, sorb to appropriate surfaces, or leach into adjacent water bodies. Secondary minerals formed during silicate weathering may absorb and concentrate the REE liberated from primary minerals [67,129]. Thus, excessive REE losses are typically related to intensive weathering of both primary and secondary mineral phases.…”

Section: Occurrence In Soilmentioning

confidence: 99%

“…The concentration of REE (sum of La-Lu) in groundwater rarely exceeds a few µg/L and typically ranges between 1 and 100 ng/L for specific representatives of this group [67,217]. Water samples from Norwegian bedrock groundwater boreholes drilled in Paleozoic and Precambrian igneous or metamorphic aquifers (pH range 7.22-8.95) contained a sum of dissolved REE concentrations of about 162 µg/L [219], which could be largely explained by the geological setting which led to REE enrichment in top and bottom soils [220].…”

Section: Groundwatermentioning

confidence: 99%

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Rare Earth Elements (REE): Origins, Dispersion, and Environmental Implications—A Comprehensive Review

Sager,

Wiche

2024

Environments

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The rare earth elements (REE) comprise a group of 16 chemically very similar elements that occur widespread in rocks, soils, and water bodies, share similar ionic radii to the essential element Ca2+, and consequently also occur in biota. Given that REE form mainly trivalent cations, they also share similarities to Al3+. Compared to their chemical cognate Ca, they have a higher reactivity. Thus, their accumulation in soils may constitute a severe environmental threat. Over the last decades, the increasing use of REE in modern technology and fertilizers raised concerns about the pollution of soils and water bodies, which led to a rapidly increasing number of publications dealing with REE toxicity to plants, animals and humans, the fate of REE in soil–plant systems, REE cycling in ecosystems and impacts of REE pollution on food security. This review aims to give an overview of the current knowledge on the occurrence of REE in the total environment, including relevant environmental processes governing their mobility, chemical speciation and transfer from abiotic compartments into biota. Beginning with an overview of analytical approaches, we summarize the current knowledge on the ecology of REE in the lithosphere, pedosphere, hydrosphere and biosphere, including impacts of soil pollution on food security and public health.

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Section: Sequential Leaching Methods To Evaluate the Mobility And Pla...mentioning

confidence: 99%

Section: Sequential Leaching Methods To Evaluate the Mobility And Pla...mentioning

confidence: 99%

Section: Occurrence In Soilmentioning

confidence: 99%

Section: Groundwatermentioning

confidence: 99%

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Rare Earth Elements (REE): Origins, Dispersion, and Environmental Implications—A Comprehensive Review

Sager,

Wiche

2024

Environments

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“…In selected alluvial soils, Aide [37] demonstrated Ce preferential accumulation on pedogenic Fe-Mn glaebules in soils having alternating oxidation-reduction conditions. In Taiwan, Wu et al [38] examined rare earth elements to infer their potential mobility upon dissolution of pedogenic Fe oxides.…”

Section: Cation Exchange and Adsorption Reactionsmentioning

confidence: 98%

The Soil Chemistry of Cerium with an Emphasis on the Formation of Ion-Adsorption Rare Earth Element Deposits

Aide

2024

Cerium - Chemistry, Technology, Geology, Soil Science and Economics

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Cerium is an important rare earth element that has numerous and essential technological applications, as do many of the rare earth elements. Given that the rare earth elements do not exist as abundant and highly concentrated ore deposits, considerable research has been devoted toward their economically feasible extraction and subsequent processing. Ion-adsorption rare earth element deposits are emerging sources for rare earth element extraction and processing, including cerium. This manuscript presents a brief introduction to the soil thermodynamics of rare earth element hydrolysis, complexation, and adsorption onto phyllosilicates. These intrinsically critical thermodynamic-based activities govern rare earth element mineral weathering, species mobility, bioavailability, and suitability for specific extraction protocols. Ion-adsorption rare earth element deposits and their formation are discussed to provide options for subsequent research involving resource utilization, conservation, and environmental protection.

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Rare Earths as Emerging Trace Element Contaminants in the Soil

Ribeiro,

de Oliveira,

Guerra

et al. 2024

Curr Pollution Rep

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Rare earth elements associated with pedogenic iron oxides in humid and tropical soils from different parent materials

Cited by 12 publications

References 38 publications

Rare Earth Elements (REE): Origins, Dispersion, and Environmental Implications—A Comprehensive Review

Rare Earth Elements (REE): Origins, Dispersion, and Environmental Implications—A Comprehensive Review

The Soil Chemistry of Cerium with an Emphasis on the Formation of Ion-Adsorption Rare Earth Element Deposits

Rare Earths as Emerging Trace Element Contaminants in the Soil

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