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Rare earth elements and their release dynamics under pre-definite redox conditions in a floodplain soil.
Chemosphere. 2017 Aug; 181:313-319.C

Abstract

For the first time, the impact of pre-definite redox conditions on the release dynamics of rare earth elements (REEs) and the determining factors pH, iron (Fe), manganese (Mn), aluminum (Al), dissolved organic carbon (DOC), dissolved inorganic carbon (DIC), and sulfate (SO42-) in a floodplain soil was elucidated using an advanced, highly sophisticated automatic biogeochemical microcosm apparatus. The redox potential (EH) ranged between +82 and + 498 mV during the experiment. The systematic increase of EH caused a decreasing pH from 6.6 to 4.6 which resulted in an enhanced mobilization and release of REEs along with Fe, Al, and Mn under oxic and acidic conditions. Also, organic matter seems to contribute to the mobilization of REEs under changing redox conditions. A factor analysis identified that the REEs form one group with EH, Fe, Al, and Mn what indicates that REEs and sesquioxides have a similar geochemical behavior. The pH, DOC, and DIC are together in another cluster which demonstrates that their behavior substantially differs from the other group. The sequential extraction procedure revealed that the majority of the REEs were bound in the residual fraction, followed by the reducible, the oxidisable and the water soluble/exchangeable/carbonate bound fraction. Future studies should further elucidate the specific release kinetics of REEs, the controlling factors on the release dynamics and the underlying mobilization processes in highly dynamic wetland soils around the globe.

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Authors+Show Affiliations

Mihajlovic J
University of Wuppertal, School of Architecture and Civil Engineering, Soil- and Groundwater-Management, Pauluskirchstraβe 7, D-42285, Wuppertal, Germany. Electronic address: j.mihajlovic@uni-wuppertal.de.
Stärk HJ
UFZ - Helmholtz Centre for Environmental Research, Department of Analytical Chemistry, Permoserstraβe 15, 04318, Leipzig, Germany. Electronic address: ha-jo.staerk@ufz.de.
Rinklebe J
University of Wuppertal, School of Architecture and Civil Engineering, Soil- and Groundwater-Management, Pauluskirchstraβe 7, D-42285, Wuppertal, Germany; Sejong University, Department of Environment and Energy, 98 Gunja-Dong, Guangjin-Gu, Seoul, South Korea. Electronic address: rinklebe@uni-wuppertal.de.

MeSH

Hydrogen-Ion ConcentrationMetals, Rare EarthOxidation-ReductionSoilSoil PollutantsSolubilityWetlands

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28453963

Citation

Mihajlovic, Julia, et al. "Rare Earth Elements and Their Release Dynamics Under Pre-definite Redox Conditions in a Floodplain Soil." Chemosphere, vol. 181, 2017, pp. 313-319.
Mihajlovic J, Stärk HJ, Rinklebe J. Rare earth elements and their release dynamics under pre-definite redox conditions in a floodplain soil. Chemosphere. 2017;181:313-319.
Mihajlovic, J., Stärk, H. J., & Rinklebe, J. (2017). Rare earth elements and their release dynamics under pre-definite redox conditions in a floodplain soil. Chemosphere, 181, 313-319. https://doi.org/10.1016/j.chemosphere.2017.04.036
Mihajlovic J, Stärk HJ, Rinklebe J. Rare Earth Elements and Their Release Dynamics Under Pre-definite Redox Conditions in a Floodplain Soil. Chemosphere. 2017;181:313-319. PubMed PMID: 28453963.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Rare earth elements and their release dynamics under pre-definite redox conditions in a floodplain soil. AU - Mihajlovic,Julia, AU - Stärk,Hans-Joachim, AU - Rinklebe,Jörg, Y1 - 2017/04/15/ PY - 2016/12/22/received PY - 2017/04/06/revised PY - 2017/04/08/accepted PY - 2017/4/30/pubmed PY - 2017/8/18/medline PY - 2017/4/29/entrez KW - Geochemical distribution of REEs KW - Lanthanum (La) KW - Scandium (Sc) KW - Wetland soils KW - Yttrium (Y) SP - 313 EP - 319 JF - Chemosphere JO - Chemosphere VL - 181 N2 - For the first time, the impact of pre-definite redox conditions on the release dynamics of rare earth elements (REEs) and the determining factors pH, iron (Fe), manganese (Mn), aluminum (Al), dissolved organic carbon (DOC), dissolved inorganic carbon (DIC), and sulfate (SO42-) in a floodplain soil was elucidated using an advanced, highly sophisticated automatic biogeochemical microcosm apparatus. The redox potential (EH) ranged between +82 and + 498 mV during the experiment. The systematic increase of EH caused a decreasing pH from 6.6 to 4.6 which resulted in an enhanced mobilization and release of REEs along with Fe, Al, and Mn under oxic and acidic conditions. Also, organic matter seems to contribute to the mobilization of REEs under changing redox conditions. A factor analysis identified that the REEs form one group with EH, Fe, Al, and Mn what indicates that REEs and sesquioxides have a similar geochemical behavior. The pH, DOC, and DIC are together in another cluster which demonstrates that their behavior substantially differs from the other group. The sequential extraction procedure revealed that the majority of the REEs were bound in the residual fraction, followed by the reducible, the oxidisable and the water soluble/exchangeable/carbonate bound fraction. Future studies should further elucidate the specific release kinetics of REEs, the controlling factors on the release dynamics and the underlying mobilization processes in highly dynamic wetland soils around the globe. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/28453963/Rare_earth_elements_and_their_release_dynamics_under_pre_definite_redox_conditions_in_a_floodplain_soil_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(17)30559-3 DB - PRIME DP - Unbound Medicine ER -