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Engström, Emma
Publikationer (10 of 46) Visa alla publikationer
Ecke, F., Benskin, J. P., Berglund, Å. M. .., Wit, C. A. d., Engström, E., Merle M., P., . . . Hörnfeldt, B. (2020). Spatio-temporal variation of metals and organic contaminants in bank voles (Myodes glareolus). Science of the Total Environment, 713, Article ID 136353.
Öppna denna publikation i ny flik eller fönster >>Spatio-temporal variation of metals and organic contaminants in bank voles (Myodes glareolus)
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2020 (Engelska)Ingår i: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 713, artikel-id 136353Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Environmental contamination with metals and organic compounds is of increasing concern for ecosystem and human health. Still, our knowledge about spatial distribution, temporal changes and ecotoxicological fate of metals and organic contaminants in wildlife is limited. We studied concentrations of 69 elements and 50 organic compounds in 300 bank voles (Myodes glareolus), Europe's most common mammal, sampled in spring and autumn 2017–2018 in five monitoring areas, representing three biogeographic regions. In addition, we compared measured concentrations with previous results from bank voles sampled within the same areas in 1995–1997 and 2001. In general, our results show regional differences, but no consistent patterns among contaminants and study areas. The exception was for the lowest concentrations of organic contaminants (e.g. perfluorooctane sulfonate, PFOS), which were generally found in the northern Swedish mountain area. Concentrations of metals and organic contaminants in adults varied seasonally with most organic contaminants being higher in spring; likely induced by diet shifts but potentially also related to age differences. In addition, metal concentrations varied between organs (liver vs. kidney), age classes (juveniles vs. adults; generally higher in adults) as well as between males and females. Concentrations of chromium and nickel in kidney and liver in the northernmost mountain area were lower in 2017–2018 than in 1995–1997 and in three of four areas, lead concentrations were lower in 2017–2018 than in 2001. Current metal concentrations (except mercury) are not expected to negatively affect the voles. Concentrations of hexachlorobenzene displayed highest concentrations in 2001 in the mountains, while it was close to detection limit in 2017–2018. Likewise, PFOS concentrations decreased in the mountains and in south-central lowland forests between 2001 and 2017–2018. Our results suggest that season, age class and sex need to be considered when designing and interpreting results from monitoring programs targeting inorganic and organic contaminants in wildlife.

Ort, förlag, år, upplaga, sidor
Elsevier, 2020
Nyckelord
Accumulation, Biomagnification, PFAS, PFOS, Small mammal, Sweden
Nationell ämneskategori
Geokemi
Forskningsämne
Tillämpad geokemi
Identifikatorer
urn:nbn:se:ltu:diva-77917 (URN)10.1016/j.scitotenv.2019.136353 (DOI)2-s2.0-85077789606 (Scopus ID)
Anmärkning

Validerad;2020;Nivå 2;2020-03-02 (alebob)

Tillgänglig från: 2020-03-02 Skapad: 2020-03-02 Senast uppdaterad: 2020-03-02Bibliografiskt granskad
Conrad, S., Ingri, J., Gelting, J., Nordblad, F., Engström, E., Rodushkin, I., . . . Öhlander, B. (2019). Distribution of Fe isotopes in particles and colloids in the salinity gradient along the Lena River plume, Laptev Sea. Biogeosciences, 16(6), 1305-1319
Öppna denna publikation i ny flik eller fönster >>Distribution of Fe isotopes in particles and colloids in the salinity gradient along the Lena River plume, Laptev Sea
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2019 (Engelska)Ingår i: Biogeosciences, ISSN 1726-4170, E-ISSN 1726-4189, Vol. 16, nr 6, s. 1305-1319Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

 Riverine Fe input is the primary Fe source for the ocean. This study is focused on the distribution of Fe along the Lena River freshwater plume in the Laptev Sea using samples from a 600 km long transect in front of the Lena River mouth. Separation of the particulate ( >  0.22 μm), colloidal (0.22 μm–1 kDa), and truly dissolved (<  1 kDa) fractions of Fe was carried out. The total Fe concentrations ranged from 0.2 to 57μM with Fe dominantly as particulate Fe. The loss of >  99% of particulate Fe and about 90% of the colloidal Fe was observed across the shelf, while the truly dissolved phase was almost constant across the Laptev Sea. Thus, the truly dissolved Fe could be an important source of bioavailable Fe for plankton in the central Arctic Ocean, together with the colloidal Fe. Fe-isotope analysis showed that the particulate phase and the sediment below the Lena River freshwater plume had negative δ56Fe values (relative to IRMM-14). The colloidal Fe phase showed negative δ56Fe values close to the river mouth (about -0.20 ‰) and positive δ56Fe values in the outermost stations (about +0.10 ‰). We suggest that the shelf zone acts as a sink for Fe particles and colloids with negative δ56Fe values, representing chemically reactive ferrihydrites. The positive δ56Fe values of the colloidal phase within the outer Lena River freshwater plume might represent Fe oxyhydroxides, which remain in the water column, and will be the predominant δ56Fe composition in the Arctic Ocean.

Ort, förlag, år, upplaga, sidor
European Geosciences Union (EGU), 2019
Nyckelord
iron isotopes, estuarine mixing, iron particles, truly dissolved iron
Nationell ämneskategori
Naturvetenskap Geokemi
Forskningsämne
Tillämpad geokemi
Identifikatorer
urn:nbn:se:ltu:diva-73352 (URN)10.5194/bg-16-1305-2019 (DOI)000462793900001 ()2-s2.0-85063632617 (Scopus ID)
Forskningsfinansiär
Knut och Alice Wallenbergs StiftelseSwedish Research Council for Environment, Agricultural Sciences and Spatial Planning, 621-2004-4039Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning, 211-621-2007PolarforskningssekretariatetSwedish Research Council for Environment, Agricultural Sciences and Spatial Planning, 2017-05687EU, Europeiska forskningsrådet, ERC-AdG CCTOP project #695331
Anmärkning

Validerad;2019;Nivå 2;2019-04-03 (johcin)

Tillgänglig från: 2019-03-29 Skapad: 2019-03-29 Senast uppdaterad: 2019-04-25Bibliografiskt granskad
Ingri, J., Conrad, S., Lidman, F., Nordblad, F., Engström, E., Rodushkin, I. & Porcelli, D. (2018). Iron isotope pathways in the boreal landscape: Role of the riparian zone. Geochimica et Cosmochimica Acta, 239, 49-60
Öppna denna publikation i ny flik eller fönster >>Iron isotope pathways in the boreal landscape: Role of the riparian zone
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2018 (Engelska)Ingår i: Geochimica et Cosmochimica Acta, ISSN 0016-7037, E-ISSN 1872-9533, Vol. 239, s. 49-60Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Stable Fe isotope compositions have been measured in water samples of the subarctic Kalix River, a first-order stream, and soil water samples from a riparian soil profile adjacent to the first-order stream (Northern Sweden). In the first-order stream, dominated by forest, both the particulate (>0.22 µm) and dissolved (<0.22 µm) phase showed negative δ56Fe values (relative to IRMM-014) during base flow and meltwater discharge in May (−0.97 to −0.09‰). The Fe isotope composition in the water from the riparian soil profile varied between −0.20 and +0.91‰ with sharp gradients near the groundwater table. A linear correlation between the δ56Fe values and the TOC/Febulk ratio was measured during snowmelt in the unfiltered river waters (δ56Fe from −0.02 to +0.54‰), suggesting mixing of two Fe components. Two groups of Fe aggregates, with different Fe isotope compositions, are formed in the boreal landscape. We propose that carbon-rich aggregates, Fe(II)(III)-OC, have negative δ56Fe values and Fe-oxyhydroxides have positive δ56Fe values. A mixture of these two components can explain temporal variations of the Fe isotope composition in the Kalix River. This study suggests that stable Fe isotopes can be used as a tool to track and characterize suspended Fe-organic carbon aggregates during transport from the soil, via first-order streams and rivers, to coastal sediment. Furthermore, the differences in Fe isotope values in the Kalix River and the first-order stream during base flow conditions suggest that the primary Fe sources for river water change throughout the year. This model is combining the Fe isotope composition of first-order streams and rivers to weathering and transport processes in the riparian soil.

Ort, förlag, år, upplaga, sidor
Elsevier, 2018
Nationell ämneskategori
Geokemi
Forskningsämne
Tillämpad geokemi
Identifikatorer
urn:nbn:se:ltu:diva-70367 (URN)10.1016/j.gca.2018.07.030 (DOI)000445036400003 ()2-s2.0-85051391721 (Scopus ID)
Anmärkning

Validerad;2018;Nivå 2;2018-08-14 (andbra)

Tillgänglig från: 2018-08-14 Skapad: 2018-08-14 Senast uppdaterad: 2019-04-25Bibliografiskt granskad
Pallavicini, N., Engström, E., Baxter, D. C., Öhlander, B., Ingri, J., Hawley, S., . . . Rodushkin, I. (2018). Ranges of B, Cd, Cr, Cu, Fe, Pb, Sr, Tl, and Zn Concentrations and Isotope Ratios in Environmental Matrices from an Urban Area. Journal of Spectroscopy, 1-17, Article ID 7408767.
Öppna denna publikation i ny flik eller fönster >>Ranges of B, Cd, Cr, Cu, Fe, Pb, Sr, Tl, and Zn Concentrations and Isotope Ratios in Environmental Matrices from an Urban Area
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2018 (Engelska)Ingår i: Journal of Spectroscopy, ISSN 2314-4920, E-ISSN 2314-4939, s. 1-17, artikel-id 7408767Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Isotopic information may provide powerful insight into the elemental cycling processes which occur in natural compartments. Further implementation of isotopic techniques in natural sciences requires a better understanding of the range of elemental and isotopic compositional variability in environmental matrices. This study assesses the local-scale concentration and isotopic composition variability of nine elements: boron (B), cadmium (Cd), chromium (Cr), copper (Cu), iron (Fe), lead (Pb), strontium (Sr), thallium (Tl), and zinc (Zn) in lysimetric waters, mushrooms, litter, needles, leaves, and lichens. Sequential extractions were also performed on soil samples from 6 depth profiles providing more detailed information on the variability of elemental concentrations and isotope ratios between the elemental pools present in soil. For most of the sample types studied the range of isotopic variability between samples spans almost the entire ranges reported in the literature for natural samples. These results represent a starting point for discussing the role of natural variability in isotopic studies (for example, as a limiting factor in the use of isotopic mixing models) and a baseline for future in-depth studies examining the controls on isotope fraction in natural systems

Ort, förlag, år, upplaga, sidor
Hindawi Publishing Corporation, 2018
Nationell ämneskategori
Geokemi
Forskningsämne
Tillämpad geokemi
Identifikatorer
urn:nbn:se:ltu:diva-72684 (URN)10.1155/2018/7408767 (DOI)000454812100001 ()2-s2.0-85059701195 (Scopus ID)
Anmärkning

Validerad;2019;Nivå 2;2019-01-25 (johcin) 

Tillgänglig från: 2019-01-25 Skapad: 2019-01-25 Senast uppdaterad: 2019-01-25Bibliografiskt granskad
Rodushkin, I., Pallavicini, N., Engström, E., Sörlin, D., Öhlander, B., Ingri, J. & Baxter, D. C. (2016). Assessment of the natural variability of B, Cd, Cu, Fe, Pb, Sr, Tl and Zn concentrations and isotopic compositions in leaves, needles and mushrooms using single sample digestion and two-column matrix separation (ed.). Paper presented at . Journal of Analytical Atomic Spectrometry, 31(1), 220-233
Öppna denna publikation i ny flik eller fönster >>Assessment of the natural variability of B, Cd, Cu, Fe, Pb, Sr, Tl and Zn concentrations and isotopic compositions in leaves, needles and mushrooms using single sample digestion and two-column matrix separation
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2016 (Engelska)Ingår i: Journal of Analytical Atomic Spectrometry, ISSN 0267-9477, E-ISSN 1364-5544, Vol. 31, nr 1, s. 220-233Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

An analytical procedure allowing multi-elemental analyses and isotope ratio measurements of eight of these (B, Cd, Cu, Fe, Pb, Sr, Tl and Zn) in matrices relevant for bio-monitoring using a single highpressure acid digestion was developed. Method blanks, separation efficiency of matrix elements, repeatability and reproducibility were evaluated using sets of preparation blanks, certified reference materials and duplicate samples prepared and analyzed over a period of several months. The method was used to assess the natural variability of concentrations and isotopic compositions in bio-indicators (tree leaves, needles and mushrooms, over 240 samples) collected mainly from a confined area in North-East Sweden. Ranges found from leaves and needles were compared with data obtained for limited numbers of samples collected in Spain, Italy, France, United Kingdom and Iceland.

Nationell ämneskategori
Geokemi
Forskningsämne
Tillämpad geologi
Identifikatorer
urn:nbn:se:ltu:diva-14151 (URN)10.1039/C5JA00274E (DOI)000367315200018 ()2-s2.0-84952898602 (Scopus ID)d7cbb017-e0af-48ac-b1b7-ca535fa94cc0 (Lokalt ID)d7cbb017-e0af-48ac-b1b7-ca535fa94cc0 (Arkivnummer)d7cbb017-e0af-48ac-b1b7-ca535fa94cc0 (OAI)
Anmärkning
Validerad; 2016; Nivå 2; 20151201 (nicpal)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
Pontér, S., Pallavicini, N., Engström, E., Baxter, D. & Rodushkin, I. (2016). Chromium isotope ratio measurements in environmental matrices by MC-ICP-MS (ed.). Paper presented at . Journal of Analytical Atomic Spectrometry, 31(7), 1464-1471
Öppna denna publikation i ny flik eller fönster >>Chromium isotope ratio measurements in environmental matrices by MC-ICP-MS
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2016 (Engelska)Ingår i: Journal of Analytical Atomic Spectrometry, ISSN 0267-9477, E-ISSN 1364-5544, Vol. 31, nr 7, s. 1464-1471Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

An analytical procedure consisting of high pressure/temperature acid digestion using an UltraCLAVE system and a one pass, single column matrix separation using DOWEX AG 1X8 anion exchange resin was applied to the determination of Cr concentrations and δ53Cr in chromites, soils, and biological matrices (epiphytic lichens and mosses) using a combination of ICP-SFMS and MC-ICP-MS. The overall reproducibility of the method was assessed by replicate preparation and Cr isotope ratio measurements performed by different operators in multiple analytical sessions over a few months and was found to be 0.11‰ (2σ). The accuracy was evaluated using commercially available reference materials for which measured data were compared with certified values (for Cr concentrations) and previously published results (for isotope data). The results demonstrate a uniform Cr isotope composition in soil depth profiles sampled in different urban environments. A strong negative correlation between δ53Cr and Cr concentrations in lichens and mosses indicates that airborne Cr from local anthropogenic source(s) is depleted in heavy isotopes.

Nationell ämneskategori
Geokemi
Forskningsämne
Tillämpad geokemi
Identifikatorer
urn:nbn:se:ltu:diva-13931 (URN)10.1039/C6JA00145A (DOI)000379494300012 ()2-s2.0-84976892422 (Scopus ID)d3fbe2ff-a320-49c9-ad6f-4ecbe0decce6 (Lokalt ID)d3fbe2ff-a320-49c9-ad6f-4ecbe0decce6 (Arkivnummer)d3fbe2ff-a320-49c9-ad6f-4ecbe0decce6 (OAI)
Anmärkning
Validerad; 2016; Nivå 2; 20160628 (andbra)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
Pallavicini, N., Engström, E., Baxter, D. C., Öhlander, B., Ingri, J. & Rodushkin, I. (2014). Cadmium isotope ratio measurements in environmental matrices by MC-ICP-MS (ed.). Paper presented at . Journal of Analytical Atomic Spectrometry, 29(9), 1570-1584
Öppna denna publikation i ny flik eller fönster >>Cadmium isotope ratio measurements in environmental matrices by MC-ICP-MS
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2014 (Engelska)Ingår i: Journal of Analytical Atomic Spectrometry, ISSN 0267-9477, E-ISSN 1364-5544, Vol. 29, nr 9, s. 1570-1584Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Various stages of an analytical method for high-precision cadmium (Cd) isotope ratio measurements by MC-ICP-MS (sample preparation, matrix separation, instrumental analysis and data evaluation) were critically evaluated and optimized for the processing of carbon-rich environmental samples. Overall reproducibility of the method was assessed by replicate preparation and Cd isotope ratio measurements in various environmental matrices (soil, sediment, Fe-Mn nodules, sludge, kidney, liver, leaves) and was found to be better than 0.1‰ (2σ for δ114Cd/110Cd) for the majority of samples. Cd isotope ratio data for several commercially-available reference materials are presented and compared with previously published results where available. The method was used in a pilot study focusing on the assessment of factors affecting Cd isotope composition in tree leaves. A summary of results obtained for a large number (n > 80) of birch (Betula pubescenes) leaves collected from different locations in Sweden and through the entire growing season is presented and potential reasons for observed variability in Cd isotope composition are discussed. Seasonal dynamics of element concentrations and isotope compositions in leaves were also compared for Os, Pb, Zn and Cd.

Nationell ämneskategori
Geokemi
Forskningsämne
Tillämpad geologi
Identifikatorer
urn:nbn:se:ltu:diva-8521 (URN)10.1039/c4ja00125g (DOI)000341064300003 ()2-s2.0-84905757655 (Scopus ID)7084b45f-c467-4588-94c9-40f1a9a13212 (Lokalt ID)7084b45f-c467-4588-94c9-40f1a9a13212 (Arkivnummer)7084b45f-c467-4588-94c9-40f1a9a13212 (OAI)
Anmärkning
Validerad; 2014; 20140821 (andbra)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
Rodríguez, N. P., Langella, F., Rodushkin, I., Engström, E., Kothe, E., Alakangas, L. & Öhlander, B. (2014). The role of bacterial consortium and organic amendment in Cu and Fe isotope fractionation in plants on a polluted mine site (ed.). Paper presented at . Environmental science and pollution research international, 21(11), 6836-6844
Öppna denna publikation i ny flik eller fönster >>The role of bacterial consortium and organic amendment in Cu and Fe isotope fractionation in plants on a polluted mine site
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2014 (Engelska)Ingår i: Environmental science and pollution research international, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 21, nr 11, s. 6836-6844Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Copper and iron isotope fractionation by plant uptake and translocation is a matter of current research. As a way to apply the use of Cu and Fe stable isotopes in the phytoremediation of contaminated sites, the effects of organic amendment and microbial addition in a mine spoiled soil seeded with Helianthus annuus in pot experiments and field trials were studied. Results show that the addition of a microbial consortium of ten bacterial strains has an influence on Cu and Fe isotope fractionation by the uptake and translocation in pot experiments, with an increase in average of 0.99‰ for the δ65Cu values from soil to roots. In the field trial, the amendment with the addition of bacteria and mycorrhiza as single and double inoculation enriches the leaves in 65Cu compared to the soil. As a result of the same trial, the δ56Fe values in the leaves are lower than those from the bulk soil, although some differences are seen according to the amendment used. Siderophores, possibly released by the bacterial consortium, can be responsible for this change in the Cu and Fe fractionation. The overall isotopic fractionation trend for Cu and Fe does not vary for pots and field experiments with or without bacteria. However variations in specific metabolic pathways related to metal-organic complexation and weathering can modify particular isotopic signatures.

Nyckelord
Cu isotopes, Fe isotopes, mine sites, phytoremediation, organic amendments, higher plants, PGPR (plant growth promoting bacteria), metal uptake, Earth sciences - Exogenous eart sciences, Geovetenskap - Exogen geovetenskap
Nationell ämneskategori
Geokemi
Forskningsämne
Tillämpad geologi
Identifikatorer
urn:nbn:se:ltu:diva-11594 (URN)10.1007/s11356-013-2156-1 (DOI)000336371000008 ()24057964 (PubMedID)2-s2.0-84901238232 (Scopus ID)a9995b28-bd8d-4e8d-8754-1ddb884bc4f4 (Lokalt ID)a9995b28-bd8d-4e8d-8754-1ddb884bc4f4 (Arkivnummer)a9995b28-bd8d-4e8d-8754-1ddb884bc4f4 (OAI)
Projekt
Using MicroBes for the REgulation of heavy metaL mobiLity at ecosystem and landscape scAle: an integrative approach for soil remediation by geobiological processes
Anmärkning
Validerad; 2014; 20130910 (natper)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2019-11-22Bibliografiskt granskad
Pallavicini, N., Ecke, F., Engström, E., Baxter, D. & Rodushkin, I. (2013). A high-throughput method for the determination of Os concentrations and isotope ratio measurements in small-size biological samples (ed.). Paper presented at . Journal of Analytical Atomic Spectrometry, 28(10), 1591-1599
Öppna denna publikation i ny flik eller fönster >>A high-throughput method for the determination of Os concentrations and isotope ratio measurements in small-size biological samples
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2013 (Engelska)Ingår i: Journal of Analytical Atomic Spectrometry, ISSN 0267-9477, E-ISSN 1364-5544, Vol. 28, nr 10, s. 1591-1599Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

An analytical method allowing multi-element characterization by external calibration, osmium (Os) concentration determination by isotope dilution (ID) and 187Os/188Os isotope abundance ratio measurement from a single sample preparation was developed. The method consists of microwave-assisted, closed-vessel acid digestion of small (0.01-0.4 g dry weight) biological samples spiked with Os solution enriched in a 190Os isotope followed by concentration and Os isotope ratio measurements using double-focusing, sector field inductively coupled plasma mass-spectrometry (ICP-SFMS) operated with methane addition to the plasma and solution nebulization (SN) sample introduction. For samples with Os content below 500 pg, complementary analysis using gas-phase introduction (GPI) on the remaining sample digests was performed. The use of disposable plastic lab ware for sample digestion and analysis by SN ICP-SFMS circumvents Os carry-over effects and improves the sample throughput and cost-efficiency of the method. For a 0.1 g dried sample, Os method limits of detection (MLODs) of 2 pg g -1 and 0.2 pg g-1 were obtained using SN or GPI, respectively. Long-term reproducibility of 187Os/188Os isotope abundance ratio measurements using the GPI approach was better than 1.5% RSD for our in-house control sample (moose kidney) with an Os concentration of approximately 5 pg g-1. Os data for several commercially available reference materials of biological or plant origin (not certified for Os) are presented. The method was used in the large scale bio-monitoring of free-living bank voles from an area affected by anthropogenic Os emissions.

Nationell ämneskategori
Geokemi
Forskningsämne
Tillämpad geologi
Identifikatorer
urn:nbn:se:ltu:diva-9547 (URN)10.1039/c3ja50201e (DOI)000324414800003 ()2-s2.0-84883871721 (Scopus ID)831b6e4f-3f9d-4a4c-b345-62813987fd40 (Lokalt ID)831b6e4f-3f9d-4a4c-b345-62813987fd40 (Arkivnummer)831b6e4f-3f9d-4a4c-b345-62813987fd40 (OAI)
Anmärkning
Validerad; 2013; 20130924 (andbra)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
Rodríguez, N. P., Engström, E., Rodushkin, I., Nason, P., Alakangas, L. & Öhlander, B. (2013). Copper and iron isotope fractionation in mine tailings at the Laver and Kristineberg mines, northern Sweden (ed.). Paper presented at International Symposium on Applied Isotope Geochemistry : 19/09/2011 - 23/09/2011. Applied Geochemistry, 32, 204-215
Öppna denna publikation i ny flik eller fönster >>Copper and iron isotope fractionation in mine tailings at the Laver and Kristineberg mines, northern Sweden
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2013 (Engelska)Ingår i: Applied Geochemistry, ISSN 0883-2927, E-ISSN 1872-9134, Vol. 32, s. 204-215Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Previous research has shown that Cu and Fe isotopes are fractionated by dissolution and precipitation reactions driven by changing redox conditions. In this study, Cu isotope composition (65Cu/63Cu ratios) was studied in profiles through sulfide-bearing tailings at the former Cu mine at Laver and in a pilot-scale test cell at the Kristineberg mine, both in northern Sweden. The profile at Kristineberg was also analysed for Fe isotope composition (56Fe/54Fe ratios). At both sites sulfide oxidation resulted in an enrichment of the lighter Cu isotope in the oxidised zone of the tailings compared to the original isotope ratio, probably due to preferential losses of the heavier Cu isotope into the liquid phase during oxidation of sulfides. In a zone with secondary enrichment of Cu, located just below the oxidation front at Laver, δ65Cu (compared to ERM-AE633) was as low as -4.35 ± 0.02‰, which can be compared to the original value of 1.31 ± 0.03‰ in the unoxidised tailings. Precipitation of covellite in the secondary Cu enrichment zone explains this fractionation. The Fe isotopic composition in the Kristineberg profile is similar in the oxidised zone and in the unoxidised zone, with average δ56Fe values (relative to the IRMM-014) of -0.58± 0.06‰ and -0.49 ± 0.05‰, respectively. At the well-defined oxidation front, δ56Fe was less negative, -0.24 ± 0.01 ‰. Processes such as Fe(II)-Fe(III) equilibrium and precipitation of Fe-(oxy)hydroxides at the oxidation front are assumed to cause this Fe isotope fractionation. This field study provides additional support for the importance of redox processes for the isotopic composition of Cu and Fe in natural systems.

Nationell ämneskategori
Geokemi
Forskningsämne
Tillämpad geologi
Identifikatorer
urn:nbn:se:ltu:diva-39911 (URN)10.1016/j.apgeochem.2012.10.012 (DOI)000317408400020 ()2-s2.0-84876319000 (Scopus ID)ed4fd2fd-964e-47a4-84de-ed2fce71ed78 (Lokalt ID)ed4fd2fd-964e-47a4-84de-ed2fce71ed78 (Arkivnummer)ed4fd2fd-964e-47a4-84de-ed2fce71ed78 (OAI)
Konferens
International Symposium on Applied Isotope Geochemistry : 19/09/2011 - 23/09/2011
Anmärkning
Validerad; 2013; 20121029 (andbra); Konferensartikel i tidskriftTillgänglig från: 2016-10-03 Skapad: 2016-10-03 Senast uppdaterad: 2019-11-22Bibliografiskt granskad
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