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Solid speciation and fractionation of rare earth elements in a spodosol profile from northern Sweden as revealed by sequential extraction

Land, Magnus and Öhlander, Björn and Ingri, Johan and Thunberg, Jonas (1999) Solid speciation and fractionation of rare earth elements in a spodosol profile from northern Sweden as revealed by sequential extraction. Chemical Geology, 160 (1-2). pp. 121-138. ISSN 0009-2541. doi:10.1016/S0009-2541(99)00064-9.

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A sequential extraction has been carried out on seven soil samples from a spodosol profile in till with granitic composition. The soil profile was sampled in northern Sweden. Five fractions were selected for extraction: (A) CH_3COONa-extractable (exchangeable/adsorbed/carbonate); (B) Na_4P_2O_7-extractable (labile organics); (C) 0.25 M NH_2OH⋅HCl-extractable (amorphous Fe-oxyhydroxides/Mn-oxides); (D) 1 M NH_2OH⋅HCl-extractable (crystalline Fe-oxides); and (E) KClO_3/HCl-extractable (organics and sulphides). Extracted rare earth elements (REE) were determined with High Resolution ICP-MS. In addition to the soil, stream water suspended particulate matter was also analysed for REE. Total concentrations in the soil samples show that the REE have been fractionated during weathering. In the acidic (pH 4.28) E-horizon all REE are depleted relative to the unweathered till. The depletion decreases with increasing atomic number. Also in the B-horizon (pH 5.86) the REE are depleted, although to a lesser extent compared to the E-horizon. Secondary phases in the B-horizon fractionate the REE in different ways. Rare earth elements extracted in extractions A and C were enriched in the intermediate REE relative to heavy and light REE if normalized to local till. In extractions B and D, the heavy REE were enriched relative to the light REE, and in extraction E a large enrichment of light REE relative to heavy REE was found. Stream water suspended particulate matter is enriched in all REE relative to local till. The light REE are more enriched than the heavy REE. Normalized La/Lu ratios in the suspended matter ranged from 1.5 to 2.4, and were negatively correlated with stream water discharge as well as with content of detrital inorganic matter in the suspended load. The only extracted phase that potentially can explain the high normalized La/Lu ratio in the suspended matter is the phase extracted in extraction E, which has a ratio of 2.0–4.2. The normalized La/Lu ratio for the rest of the extractions ranged from 0.5 to 1.2. It is concluded that organic matter seems to be important for the particulate transport of REE in northern coniferous areas.

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Additional Information:© 1999 Elsevier Science B.V. Received 18 August 1998, Revised 25 March 1999, Accepted 25 March 1999, Available online 7 July 1999. This study was supported by grants from the Swedish Geological Survey, SGU. The chemical analyses were performed at SGAB in Luleå, Sweden. Ilia Rodushkin is thanked for the work with HR-ICP-MS. This paper benefited from valuable comments by A.F. White and J.R. Bacon who reviewed the manuscript. [JD]
Funding AgencyGrant Number
Swedish Geological SurveyUNSPECIFIED
Subject Keywords:Rare earth element; Spodosol; Chemical weathering; Extraction; Stream water; Particles; Transport
Issue or Number:1-2
Record Number:CaltechAUTHORS:20170913-091802751
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Official Citation:Magnus Land, Björn Öhlander, Johan Ingri, Jonas Thunberg, Solid speciation and fractionation of rare earth elements in a spodosol profile from northern Sweden as revealed by sequential extraction, Chemical Geology, Volume 160, Issues 1–2, 29 July 1999, Pages 121-138, ISSN 0009-2541, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81402
Deposited By: Tony Diaz
Deposited On:14 Sep 2017 22:19
Last Modified:15 Nov 2021 19:43

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