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Lanthanoid behaviou...
Lanthanoid behaviour in an acidic landscape
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- Åström, Mats E. (author)
- Linnéuniversitetet,Institutionen för naturvetenskap, NV
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Nystrand, Miriam (author)
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- Gustafsson, Jon Petter (author)
- KTH,Mark- och vattenteknik
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Österholm, Peter (author)
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Nordmyr, Linda (author)
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Reynolds, Jason K. (author)
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- Peltola, Pasi (author)
- Linnéuniversitetet,Institutionen för naturvetenskap, NV
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(creator_code:org_t)
- Elsevier BV, 2010
- 2010
- English.
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In: Geochimica et Cosmochimica Acta. - : Elsevier BV. - 0016-7037 .- 1872-9533. ; 74:3, s. 829-845
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- Lanthanoids were studied in a boreal landscape where an abundance of acid sulfate soils and Histosols provide a unique opportunity to increase the understanding of flow these metals behave in acidic soils and waters and interact with soil and aqueous organic matter. In the acid sulfate soils lanthanoids are mobile as reflected in high to very high concentrations in soil water and runoff (typically a few mg 1(-1) but Lip to 12 mg 1(-1)) and abundant release by several relatively weak extractants (ammonium acetate EDTA, sodium pyrophosphate, hydroxylamine hydrochloride) applied on bulk soil. Normalisation with the lanthanoid pool in the underlying parent materials (sulphide-bearing sediments deposited in brackish-water) and soil water showed that the extensive release/retention in the acidic soil was accompanied by large, and variable, fractionation trends across the lanthanoid series. In low-order streams draining these soils, the lanthanoid concentrations were high and, as indicated by frontal ultrafiltration and geochemical modelling, largely dissolved (<1 kDa) in the form of the species LnSO(4)(+) and Ln(3+). In other moderately acidic stream waters (pH 4.3-4.6), organic complexation was predicted to be important in the <1 kDa fraction (especially for the heavy lanthanoids) and strongly dominating in the colloidal phase (1 kDa-0.45 mu m). Along the main stem of a stream in focus (catchment area of 223 km(2)), lanthanoid concentrations increased downstream, in particular during high flows, caused by a downstream increase in the proportion of acid sulfate soils which are extensively flushed during wet periods. The geochemical models applied to the colloidal Ln-organic phase were not successful in predicting the measured fractionation patterns.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
Keyword
- rare-earth-elements
- flow ultrafiltration technique
- humic substances
- complexation
- natural terrestrial waters
- sulfate soils
- trace-elements
- ion-binding
- organic-matter
- colloidal particles
- ree
- fractionation
- Earth sciences
- Geovetenskap
- Environmental chemistry
- Environmental Chemistry
Publication and Content Type
- ref (subject category)
- art (subject category)
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