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Publications (10 of 103) Show all publications
Entwistle, J. A., Amaibi, P. M., Dean, J. R., Deary, M. E., Medock, D., Morton, J., . . . Bramwell, L. (2019). An apple a day? Assessing gardeners' lead exposure in urban agriculture sites to improve the derivation of soil assessment criteria. Environment International, 122, 130-141
Open this publication in new window or tab >>An apple a day? Assessing gardeners' lead exposure in urban agriculture sites to improve the derivation of soil assessment criteria
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2019 (English)In: Environment International, ISSN 0160-4120, E-ISSN 1873-6750, Vol. 122, p. 130-141Article in journal (Refereed) Published
Abstract [en]

Globally, many of our urban agriculture sites (UAS) contain high levels of lead (Pb), a contaminant of toxicological concern to humans. To improve the derivation of soil assessment criteria at UAS, and avoid inappropriate closure of these valuable community spaces, we sampled nearly 280 paired soil and crop samples across 31 UAS gardens. This sampling was coupled with an exposure and food frequency questionnaire and participants blood Pb levels (BLL), (43 gardeners and 29 non-gardening neighbours). In 98% of the sampled soils, Pb concentrations were above the current UK soil guideline for UAS (80 mg/kg), however despite the high soil Pb (geometric mean: 324 mg/kg), and high soil bioaccessible Pb (geometric mean: 58.7%), all participants BLL were <4.1 μg/dL (range: 0.6–4.1 μg/dL). Indeed, there was no statistically significant difference between the BLL of the UAS gardeners and those of their non-gardening neighbours (p = 0.569).

Pb uptake, however, varied with crop type and our study highlights the suitability of certain crops for growing at UAS with elevated Pb (e.g. tubers, shrub and tree fruit), whilst limiting the consumption of others (selected root vegetables, such as rhubarb, beetroot, parsnips and carrots, with observed Pb concentrations > 0.1 mg/kg FW).

The importance of defining the exposure scenario of a specific sub-population (i.e. UAS gardeners) is highlighted. Our preferred models predict site specific assessment criteria (SSAC) of 722–1634 mg/kg. We found fruit and vegetable consumption rates by all participants, and not just the UAS gardeners, to be considerably higher than those currently used to derive the UK's category 4 screening levels (C4SLs). Furthermore, the soil to plant concentration factors (SPCFs) used to derive the UAS C4SL significantly over predict Pb uptake. Our study indicates it may be appropriate to develop a distinct exposure dataset for UAS. In particular we recommend the derivation of SPCFs that are reflective of urban soils, both in terms of the range of soil Pb concentrations typically observed, but also the sources (and hence human oral bioaccessibility and plant-availability) of this Pb.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Urban soil, Urban agriculture sites, Lead, Human health risk assessment, Blood lead, Crop lead
National Category
Geochemistry
Research subject
Applied Geochemistry
Identifiers
urn:nbn:se:ltu:diva-71687 (URN)10.1016/j.envint.2018.10.054 (DOI)000454356400011 ()30449630 (PubMedID)2-s2.0-85056737546 (Scopus ID)
Note

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

Available from: 2018-11-21 Created: 2018-11-21 Last updated: 2019-01-25Bibliographically approved
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
Open this publication in new window or tab >>Distribution of Fe isotopes in particles and colloids in the salinity gradient along the Lena River plume, Laptev Sea
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2019 (English)In: Biogeosciences, ISSN 1726-4170, E-ISSN 1726-4189, Vol. 16, no 6, p. 1305-1319Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
European Geosciences Union (EGU), 2019
Keywords
iron isotopes, estuarine mixing, iron particles, truly dissolved iron
National Category
Natural Sciences Geochemistry
Research subject
Applied Geochemistry
Identifiers
urn:nbn:se:ltu:diva-73352 (URN)10.5194/bg-16-1305-2019 (DOI)000462793900001 ()2-s2.0-85063632617 (Scopus ID)
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council for Environment, Agricultural Sciences and Spatial Planning, 621-2004-4039Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning, 211-621-2007Swedish Polar Research SecretariatSwedish Research Council for Environment, Agricultural Sciences and Spatial Planning, 2017-05687EU, European Research Council, ERC-AdG CCTOP project #695331
Note

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

Available from: 2019-03-29 Created: 2019-03-29 Last updated: 2019-04-17Bibliographically approved
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.
Open this publication in new window or tab >>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 (English)In: Journal of Spectroscopy, ISSN 2314-4920, E-ISSN 2314-4939, p. 1-17, article id 7408767Article in journal (Refereed) 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

Place, publisher, year, edition, pages
Hindawi Publishing Corporation, 2018
National Category
Geochemistry
Research subject
Applied Geochemistry
Identifiers
urn:nbn:se:ltu:diva-72684 (URN)10.1155/2018/7408767 (DOI)000454812100001 ()2-s2.0-85059701195 (Scopus ID)
Note

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

Available from: 2019-01-25 Created: 2019-01-25 Last updated: 2019-01-25Bibliographically approved
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
Open this publication in new window or tab >>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 (English)In: Journal of Analytical Atomic Spectrometry, ISSN 0267-9477, E-ISSN 1364-5544, Vol. 31, no 1, p. 220-233Article in journal (Refereed) 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.

National Category
Geochemistry
Research subject
Applied Geology
Identifiers
urn:nbn:se:ltu:diva-14151 (URN)10.1039/C5JA00274E (DOI)000367315200018 ()2-s2.0-84952898602 (Scopus ID)d7cbb017-e0af-48ac-b1b7-ca535fa94cc0 (Local ID)d7cbb017-e0af-48ac-b1b7-ca535fa94cc0 (Archive number)d7cbb017-e0af-48ac-b1b7-ca535fa94cc0 (OAI)
Note
Validerad; 2016; Nivå 2; 20151201 (nicpal)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
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
Open this publication in new window or tab >>Chromium isotope ratio measurements in environmental matrices by MC-ICP-MS
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2016 (English)In: Journal of Analytical Atomic Spectrometry, ISSN 0267-9477, E-ISSN 1364-5544, Vol. 31, no 7, p. 1464-1471Article in journal (Refereed) 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.

National Category
Geochemistry
Research subject
Tillämpad geokemi
Identifiers
urn:nbn:se:ltu:diva-13931 (URN)10.1039/C6JA00145A (DOI)000379494300012 ()2-s2.0-84976892422 (Scopus ID)d3fbe2ff-a320-49c9-ad6f-4ecbe0decce6 (Local ID)d3fbe2ff-a320-49c9-ad6f-4ecbe0decce6 (Archive number)d3fbe2ff-a320-49c9-ad6f-4ecbe0decce6 (OAI)
Note
Validerad; 2016; Nivå 2; 20160628 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Rodríguez, N. P., Khoshkhoo, M., Sandström, Å., Rodushkin, I., Alakangas, L. & Öhlander, B. (2015). Isotopic signature of Cu and Fe during bioleaching and electrochemical leaching of a chalcopyrite concentrate (ed.). Paper presented at . International Journal of Mineral Processing, 134, 58-65
Open this publication in new window or tab >>Isotopic signature of Cu and Fe during bioleaching and electrochemical leaching of a chalcopyrite concentrate
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2015 (English)In: International Journal of Mineral Processing, ISSN 0301-7516, E-ISSN 1879-3525, Vol. 134, p. 58-65Article in journal (Refereed) Published
Abstract [en]

Bioleaching is an important process in metallurgy and in environmental sciences, either for the acquisition of metals or for the formation of acid rock drainage. In this study the implications of the processes during bioleaching of a pyritic chalcopyrite concentrate were analysed regarding its Cu and Fe isotope fractionation. The development of the redox potential during the bioleaching experiment was then simulated in an electrochemical cell in absence of microorganisms to investigate the effect of microbial activity on the Cu and Fe isotope fractionations. The leaching experiments were performed for 28 days at 45 °C with a solid content of 2.5% (w/v) at pH 1.5. It was found that Cu dissolution efficiency was similar in both experiments and the leaching curves were linear with no sign of passivation due to presence of pyrite. The heavy Cu isotope (δ65Cu) was leached more easily and as a result the leachate was enriched with the heavy Cu isotope at the beginning of both experiments and as the leaching progressed δ65Cu values in the leachate became similar to the ones of the chalcopyrite concentrate, confirming an equilibrium fractionation happening in a closed system. There was no distinct difference in the Cu and Fe isotope fractionations in absence and presence of microorganisms. Finally based on Cu and Fe isotope signatures, a simplified method is suggested for the estimation of the leaching extent during the oxidisation of sulphide materials in natural systems.

National Category
Metallurgy and Metallic Materials Geochemistry
Research subject
Process Metallurgy; Applied Geology
Identifiers
urn:nbn:se:ltu:diva-5240 (URN)10.1016/j.minpro.2014.11.010 (DOI)000348960600008 ()2-s2.0-84924082946 (Scopus ID)348dc9fd-2b99-4601-aa07-7e40c905974c (Local ID)348dc9fd-2b99-4601-aa07-7e40c905974c (Archive number)348dc9fd-2b99-4601-aa07-7e40c905974c (OAI)
Note
Validerad; 2014; Nivå 2; 20141128 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
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
Open this publication in new window or tab >>Cadmium isotope ratio measurements in environmental matrices by MC-ICP-MS
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2014 (English)In: Journal of Analytical Atomic Spectrometry, ISSN 0267-9477, E-ISSN 1364-5544, Vol. 29, no 9, p. 1570-1584Article in journal (Refereed) 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.

National Category
Geochemistry
Research subject
Applied Geology
Identifiers
urn:nbn:se:ltu:diva-8521 (URN)10.1039/c4ja00125g (DOI)000341064300003 ()2-s2.0-84905757655 (Scopus ID)7084b45f-c467-4588-94c9-40f1a9a13212 (Local ID)7084b45f-c467-4588-94c9-40f1a9a13212 (Archive number)7084b45f-c467-4588-94c9-40f1a9a13212 (OAI)
Note
Validerad; 2014; 20140821 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
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
Open this publication in new window or tab >>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 (English)In: Environmental science and pollution research international, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 21, no 11, p. 6836-6844Article in journal (Refereed) 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.

Keywords
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
National Category
Geochemistry
Research subject
Applied Geology
Identifiers
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 (Local ID)a9995b28-bd8d-4e8d-8754-1ddb884bc4f4 (Archive number)a9995b28-bd8d-4e8d-8754-1ddb884bc4f4 (OAI)
Projects
Using MicroBes for the REgulation of heavy metaL mobiLity at ecosystem and landscape scAle: an integrative approach for soil remediation by geobiological processes
Note
Validerad; 2014; 20130910 (natper)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
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
Open this publication in new window or tab >>A high-throughput method for the determination of Os concentrations and isotope ratio measurements in small-size biological samples
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2013 (English)In: Journal of Analytical Atomic Spectrometry, ISSN 0267-9477, E-ISSN 1364-5544, Vol. 28, no 10, p. 1591-1599Article in journal (Refereed) 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.

National Category
Geochemistry
Research subject
Applied Geology
Identifiers
urn:nbn:se:ltu:diva-9547 (URN)10.1039/c3ja50201e (DOI)000324414800003 ()2-s2.0-84883871721 (Scopus ID)831b6e4f-3f9d-4a4c-b345-62813987fd40 (Local ID)831b6e4f-3f9d-4a4c-b345-62813987fd40 (Archive number)831b6e4f-3f9d-4a4c-b345-62813987fd40 (OAI)
Note
Validerad; 2013; 20130924 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
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
Open this publication in new window or tab >>Copper and iron isotope fractionation in mine tailings at the Laver and Kristineberg mines, northern Sweden
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2013 (English)In: Applied Geochemistry, ISSN 0883-2927, E-ISSN 1872-9134, Vol. 32, p. 204-215Article in journal (Refereed) 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.

National Category
Geochemistry
Research subject
Applied Geology
Identifiers
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 (Local ID)ed4fd2fd-964e-47a4-84de-ed2fce71ed78 (Archive number)ed4fd2fd-964e-47a4-84de-ed2fce71ed78 (OAI)
Conference
International Symposium on Applied Isotope Geochemistry : 19/09/2011 - 23/09/2011
Note
Validerad; 2013; 20121029 (andbra); Konferensartikel i tidskriftAvailable from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-07-10Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-4505-4590

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