XAS study of iron speciation in soils and waters from a boreal catchment
Iron (Fe) is a key element, strongly influencing the biogeochemistry of soils, sediments and waters, but the knowledge about the variety of Fe species present in these systems is still limited. In this work we have used X-ray absorption spectroscopy (XAS) to study the speciation of Fe in soils and w...
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Online Access: | https://lup.lub.lu.se/record/4327003 https://doi.org/10.1016/j.chemgeo.2013.11.023 |
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ftulundlup:oai:lup.lub.lu.se:0ca44fbe-d2e5-4d0a-b96a-2264234d911e 2023-05-15T17:44:56+02:00 XAS study of iron speciation in soils and waters from a boreal catchment Sundman, Anneli Karlsson, Torbjorn Laudon, Hjalmar Persson, Per 2014 https://lup.lub.lu.se/record/4327003 https://doi.org/10.1016/j.chemgeo.2013.11.023 eng eng Elsevier https://lup.lub.lu.se/record/4327003 http://dx.doi.org/10.1016/j.chemgeo.2013.11.023 wos:000329409600009 scopus:84891357618 Chemical Geology; 364, pp 93-102 (2014) ISSN: 0009-2541 Earth and Related Environmental Sciences Fe speciation XAS Stream water Soil solutions Ground water Krycklan catchment contributiontojournal/article info:eu-repo/semantics/article text 2014 ftulundlup https://doi.org/10.1016/j.chemgeo.2013.11.023 2023-02-01T23:29:42Z Iron (Fe) is a key element, strongly influencing the biogeochemistry of soils, sediments and waters, but the knowledge about the variety of Fe species present in these systems is still limited. In this work we have used X-ray absorption spectroscopy (XAS) to study the speciation of Fe in soils and waters from a boreal catchment in northern Sweden. The aim was to better understand the controls of Fe speciation across different, but adjacent landscape elements including soil, soil solution, groundwater and stream water draining catchments with contrasting land characteristics. Our results showed that all samples contained mixtures of Fe(II) and Fe(III). The soils consisted of Fe phyllosilicates, Fe (hydr) oxides and Fe complexed by natural organic matter (NOM). All aqueous samples contained Fe(II)- and Fe(III)-NOM complexes, often in combination with Fe(III) (hydr) oxides that were associated with NOM. The variation in contribution from Fe-NOM and Fe (hydr) oxides was controlled by pH and total concentrations of NOM. The XAS spectra suggested formation of mononuclear Fe-NOM complexes consisting of chelate ring structures, but it could not be determined whether they originated solely from Fe(III)- or from a mixture of Fe(II)/Fe(III)-NOM complexes. Our collective results showed that the Fe speciation was highly variable across the different landscape elements and streams. This variation was manifested both in the distribution between mononuclear Fe-NOM complexes and Fe (hydr) oxides associated with NOM and between Fe(II) and Fe(III). These results highlight the complexity of Fe speciation in natural environmental systems and thus the challenges in interpreting Fe reactivity. (C) 2013 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Northern Sweden Lund University Publications (LUP) Chemical Geology 364 93 102 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Earth and Related Environmental Sciences Fe speciation XAS Stream water Soil solutions Ground water Krycklan catchment |
spellingShingle |
Earth and Related Environmental Sciences Fe speciation XAS Stream water Soil solutions Ground water Krycklan catchment Sundman, Anneli Karlsson, Torbjorn Laudon, Hjalmar Persson, Per XAS study of iron speciation in soils and waters from a boreal catchment |
topic_facet |
Earth and Related Environmental Sciences Fe speciation XAS Stream water Soil solutions Ground water Krycklan catchment |
description |
Iron (Fe) is a key element, strongly influencing the biogeochemistry of soils, sediments and waters, but the knowledge about the variety of Fe species present in these systems is still limited. In this work we have used X-ray absorption spectroscopy (XAS) to study the speciation of Fe in soils and waters from a boreal catchment in northern Sweden. The aim was to better understand the controls of Fe speciation across different, but adjacent landscape elements including soil, soil solution, groundwater and stream water draining catchments with contrasting land characteristics. Our results showed that all samples contained mixtures of Fe(II) and Fe(III). The soils consisted of Fe phyllosilicates, Fe (hydr) oxides and Fe complexed by natural organic matter (NOM). All aqueous samples contained Fe(II)- and Fe(III)-NOM complexes, often in combination with Fe(III) (hydr) oxides that were associated with NOM. The variation in contribution from Fe-NOM and Fe (hydr) oxides was controlled by pH and total concentrations of NOM. The XAS spectra suggested formation of mononuclear Fe-NOM complexes consisting of chelate ring structures, but it could not be determined whether they originated solely from Fe(III)- or from a mixture of Fe(II)/Fe(III)-NOM complexes. Our collective results showed that the Fe speciation was highly variable across the different landscape elements and streams. This variation was manifested both in the distribution between mononuclear Fe-NOM complexes and Fe (hydr) oxides associated with NOM and between Fe(II) and Fe(III). These results highlight the complexity of Fe speciation in natural environmental systems and thus the challenges in interpreting Fe reactivity. (C) 2013 Elsevier B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Sundman, Anneli Karlsson, Torbjorn Laudon, Hjalmar Persson, Per |
author_facet |
Sundman, Anneli Karlsson, Torbjorn Laudon, Hjalmar Persson, Per |
author_sort |
Sundman, Anneli |
title |
XAS study of iron speciation in soils and waters from a boreal catchment |
title_short |
XAS study of iron speciation in soils and waters from a boreal catchment |
title_full |
XAS study of iron speciation in soils and waters from a boreal catchment |
title_fullStr |
XAS study of iron speciation in soils and waters from a boreal catchment |
title_full_unstemmed |
XAS study of iron speciation in soils and waters from a boreal catchment |
title_sort |
xas study of iron speciation in soils and waters from a boreal catchment |
publisher |
Elsevier |
publishDate |
2014 |
url |
https://lup.lub.lu.se/record/4327003 https://doi.org/10.1016/j.chemgeo.2013.11.023 |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_source |
Chemical Geology; 364, pp 93-102 (2014) ISSN: 0009-2541 |
op_relation |
https://lup.lub.lu.se/record/4327003 http://dx.doi.org/10.1016/j.chemgeo.2013.11.023 wos:000329409600009 scopus:84891357618 |
op_doi |
https://doi.org/10.1016/j.chemgeo.2013.11.023 |
container_title |
Chemical Geology |
container_volume |
364 |
container_start_page |
93 |
op_container_end_page |
102 |
_version_ |
1766147246716354560 |