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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.
Åpne denne publikasjonen i ny fane eller vindu >>Spatio-temporal variation of metals and organic contaminants in bank voles (Myodes glareolus)
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2020 (engelsk)Inngår i: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 713, artikkel-id 136353Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Elsevier, 2020
Emneord
Accumulation, Biomagnification, PFAS, PFOS, Small mammal, Sweden
HSV kategori
Forskningsprogram
Tillämpad geokemi
Identifikatorer
urn:nbn:se:ltu:diva-77917 (URN)10.1016/j.scitotenv.2019.136353 (DOI)2-s2.0-85077789606 (Scopus ID)
Merknad

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

Tilgjengelig fra: 2020-03-02 Laget: 2020-03-02 Sist oppdatert: 2020-03-02bibliografisk kontrollert
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
Åpne denne publikasjonen i ny fane eller vindu >>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 (engelsk)Inngår i: Environment International, ISSN 0160-4120, E-ISSN 1873-6750, Vol. 122, s. 130-141Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Elsevier, 2019
Emneord
Urban soil, Urban agriculture sites, Lead, Human health risk assessment, Blood lead, Crop lead
HSV kategori
Forskningsprogram
Tillämpad geokemi
Identifikatorer
urn:nbn:se:ltu:diva-71687 (URN)10.1016/j.envint.2018.10.054 (DOI)000454356400011 ()30449630 (PubMedID)2-s2.0-85056737546 (Scopus ID)
Merknad

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

Tilgjengelig fra: 2018-11-21 Laget: 2018-11-21 Sist oppdatert: 2019-01-25bibliografisk kontrollert
Boesen, A. H., Thiel, A., Fuchs, B., Evans, A. L., Bertelsen, M. F., Rodushkin, I. & Arnemo, J. M. (2019). Assessment of the LeadCare® Plus for Use on Scandinavian Brown Bears (Ursus arctos). Frontiers in Veterinary Science, 6, Article ID 285.
Åpne denne publikasjonen i ny fane eller vindu >>Assessment of the LeadCare® Plus for Use on Scandinavian Brown Bears (Ursus arctos)
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2019 (engelsk)Inngår i: Frontiers in Veterinary Science, ISSN 2297-1769, Vol. 6, artikkel-id 285Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Lead (Pb) exposure is associated with adverse health effects in both humans and wildlife. Blood lead levels (BLL) of sentinel wildlife species can be used to monitor environmental lead exposure and ecosystem health. BLL analyzers, such as the LeadCare (R), are validated for use in humans, assessed for use in some avian species and cattle, and are increasingly being used on wildlife to monitor lead exposure. The LeadCare (R) analyzers use a technique called anodic stripping voltammetry (ASV). Species-specific conversion equations have been proposed to approximate the levels found with gold standard measuring methods such as inductively coupled plasma mass spectrometry (ICP-MS) because the ASV method has been shown to underestimate BLL in some species. In this study we assessed the LeadCare (R) Plus (LCP) for use on Scandinavian brown bears (Ursus arctos). LCP measurements were correlated with ICP-MS with a Bland-Altman analyzed bias of 16.3-22.5%, showing a consistent overestimation of BLL analyzed with LCP. Based on this analysis we provide conversion equations for calculating ICP-MS BLL based on the LCP results in Scandinavian brown bears. Our study shows that the LeadCare (R) Plus can be used for monitoring of lead exposure by approximating gold standard levels using conversion equations. This enables comparison with other gold standard measured BLL within the observed range of this study (38.20-174.00 mu g/L). Our study also found that Scandinavian brown bears are highly exposed to environmental lead.

sted, utgiver, år, opplag, sider
Frontiers Media S.A., 2019
Emneord
blood lead, lead exposure, Ursus, anodic stripping voltammetry, Pb
HSV kategori
Forskningsprogram
Tillämpad geokemi
Identifikatorer
urn:nbn:se:ltu:diva-76268 (URN)10.3389/fvets.2019.00285 (DOI)000482984800001 ()2-s2.0-85072725355 (Scopus ID)
Merknad

Validerad;2019;Nivå 2;2019-10-07 (johcin)

Tilgjengelig fra: 2019-10-07 Laget: 2019-10-07 Sist oppdatert: 2019-10-08bibliografisk kontrollert
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
Åpne denne publikasjonen i ny fane eller vindu >>Distribution of Fe isotopes in particles and colloids in the salinity gradient along the Lena River plume, Laptev Sea
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2019 (engelsk)Inngår i: Biogeosciences, ISSN 1726-4170, E-ISSN 1726-4189, Vol. 16, nr 6, s. 1305-1319Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
European Geosciences Union (EGU), 2019
Emneord
iron isotopes, estuarine mixing, iron particles, truly dissolved iron
HSV kategori
Forskningsprogram
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 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
Merknad

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

Tilgjengelig fra: 2019-03-29 Laget: 2019-03-29 Sist oppdatert: 2019-04-25bibliografisk kontrollert
Filella, M., Reimann, C., Biver, M., Rodushkin, I. & Rodushkina, K. (2019). Tellurium in the environment: current knowledge and identification of gaps. Environmental Chemistry, 16(4), 215-228
Åpne denne publikasjonen i ny fane eller vindu >>Tellurium in the environment: current knowledge and identification of gaps
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2019 (engelsk)Inngår i: Environmental Chemistry, ISSN 1448-2517, E-ISSN 1449-8979, Vol. 16, nr 4, s. 215-228Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Tellurium has recently become a ‘technology-critical element’ increasingly used in new applications. Thus, potential environmental impacts need to be evaluated. This, in turn, requires knowledge of its typical concentrations in the environment along with better understanding of the chemical processes governing its environmental behaviour. We evaluate the current situation of our understanding of tellurium in the environment and identify the areas where improvements in measurement technology are most needed. The comprehensive evaluation of published data described in this study shows that values for tellurium concentrations in the different environmental compartments are scarce, particularly in the case of natural waters where reliable estimates of tellurium concentrations in seawater and freshwater cannot even be produced. Data in air are even less abundant than for natural water. Concentration data do exist for soils suggesting a predominant geological origin. Some urban soil surveys and lake sediment data close to tellurium contamination sources point to possible effects on the element’s distribution as a result of human activity; long-range atmospheric transport remains to be proved. Current knowledge about tellurium behaviour in the environment is strongly hindered by analytical difficulties, with insufficiently low analytical detection limits being the main limitation. For instance, ‘dissolved’ concentrations are well below current analytical capabilities in natural water and often require pre-concentration procedures that, for the moment, do not provide consistent results; solid samples require complex mineralisation procedures that often exclude tellurium from routine multielement studies. In general, the use of available measuring techniques is far from straightforward and needs particular expertise. Overcoming the current analytical limitations is essential to be able to progress in the field.

sted, utgiver, år, opplag, sider
CSIRO Publishing, 2019
HSV kategori
Forskningsprogram
Tillämpad geokemi
Identifikatorer
urn:nbn:se:ltu:diva-75542 (URN)10.1071/EN18229 (DOI)000473747800002 ()
Merknad

Validerad;2019;Nivå 2;2019-08-15 (johcin)

Tilgjengelig fra: 2019-08-15 Laget: 2019-08-15 Sist oppdatert: 2019-08-15bibliografisk kontrollert
Conrad, S., Wuttig, K., Jansen, N., Rodushkin, I. & Ingri, J. (2019). The stability of Fe isotope signatures during low salinity mixing in subarctic estuaries. Aquatic geochemistry, 25(5-6), 195-218
Åpne denne publikasjonen i ny fane eller vindu >>The stability of Fe isotope signatures during low salinity mixing in subarctic estuaries
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2019 (engelsk)Inngår i: Aquatic geochemistry, ISSN 1380-6165, E-ISSN 1573-1421, Vol. 25, nr 5-6, s. 195-218Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We have studied iron (Fe)-isotope signals in particles (> 0.22 µm) and the dissolved phase (< 0.22 µm) in two subarctic, boreal rivers, their estuaries and the adjacent sea in northern Sweden. Both rivers, the Råne and the Kalix, are enriched in Fe and organic carbon (up to 29 µmol/L and up to 730 µmol/L, respectively). Observed changes in the particulate and dissolved phase during spring flood in May suggest different sources of Fe to the rivers during different seasons. While particles show a positive Fe-isotope signal during winter, during spring flood, the values are negative. Increased discharge due to snowmelt in the boreal region is most times accompanied by flushing of the organic-rich sub-surface layers. These upper podzol soil layers have been shown to be a source for Fe-organic carbon aggregates with a negative Fe-isotope signal. During winter, the rivers are mostly fed by deep groundwater, where Fe occurs as Fe(oxy)hydroxides, with a positive Fe-isotope signal. Flocculation during initial estuarine mixing does not change the Fe-isotope compositions of the two phases. Data indicate that the two groups of Fe aggregates flocculate diversely in the estuaries due to differences in their surface structure. Within the open sea, the particulate phase showed heavier δ56Fe values than in the estuaries. Our data indicate the flocculation of the negative Fe-isotope signal in a low salinity environment, due to changes in the ionic strength and further the increase of pH.

sted, utgiver, år, opplag, sider
Springer, 2019
Emneord
Fe-isotopes, Fe geochemistry, Dissolved and particulate Fe, Organically complexed Fe, Fe(oxy)hydroxides, Salinity gradient, Spring flood
HSV kategori
Forskningsprogram
Tillämpad geokemi
Identifikatorer
urn:nbn:se:ltu:diva-73760 (URN)10.1007/s10498-019-09360-z (DOI)000494758500001 ()
Merknad

Validerad;2019;Nivå 2;2019-12-06 (johcin)

Tilgjengelig fra: 2019-04-25 Laget: 2019-04-25 Sist oppdatert: 2019-12-06bibliografisk kontrollert
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.
Åpne denne publikasjonen i ny fane eller vindu >>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 (engelsk)Inngår i: Journal of Spectroscopy, ISSN 2314-4920, E-ISSN 2314-4939, s. 1-17, artikkel-id 7408767Artikkel i tidsskrift (Fagfellevurdert) 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

sted, utgiver, år, opplag, sider
Hindawi Publishing Corporation, 2018
HSV kategori
Forskningsprogram
Tillämpad geokemi
Identifikatorer
urn:nbn:se:ltu:diva-72684 (URN)10.1155/2018/7408767 (DOI)000454812100001 ()2-s2.0-85059701195 (Scopus ID)
Merknad

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

Tilgjengelig fra: 2019-01-25 Laget: 2019-01-25 Sist oppdatert: 2019-01-25bibliografisk kontrollert
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
Åpne denne publikasjonen i ny fane eller vindu >>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 (engelsk)Inngår i: Journal of Analytical Atomic Spectrometry, ISSN 0267-9477, E-ISSN 1364-5544, Vol. 31, nr 1, s. 220-233Artikkel i tidsskrift (Fagfellevurdert) 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.

HSV kategori
Forskningsprogram
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 (Lokal ID)d7cbb017-e0af-48ac-b1b7-ca535fa94cc0 (Arkivnummer)d7cbb017-e0af-48ac-b1b7-ca535fa94cc0 (OAI)
Merknad
Validerad; 2016; Nivå 2; 20151201 (nicpal)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert
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
Åpne denne publikasjonen i ny fane eller vindu >>Chromium isotope ratio measurements in environmental matrices by MC-ICP-MS
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2016 (engelsk)Inngår i: Journal of Analytical Atomic Spectrometry, ISSN 0267-9477, E-ISSN 1364-5544, Vol. 31, nr 7, s. 1464-1471Artikkel i tidsskrift (Fagfellevurdert) 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.

HSV kategori
Forskningsprogram
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 (Lokal ID)d3fbe2ff-a320-49c9-ad6f-4ecbe0decce6 (Arkivnummer)d3fbe2ff-a320-49c9-ad6f-4ecbe0decce6 (OAI)
Merknad
Validerad; 2016; Nivå 2; 20160628 (andbra)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert
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
Åpne denne publikasjonen i ny fane eller vindu >>Isotopic signature of Cu and Fe during bioleaching and electrochemical leaching of a chalcopyrite concentrate
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2015 (engelsk)Inngår i: International Journal of Mineral Processing, ISSN 0301-7516, E-ISSN 1879-3525, Vol. 134, s. 58-65Artikkel i tidsskrift (Fagfellevurdert) 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.

HSV kategori
Forskningsprogram
Processmetallurgi; Tillämpad geologi
Identifikatorer
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 (Lokal ID)348dc9fd-2b99-4601-aa07-7e40c905974c (Arkivnummer)348dc9fd-2b99-4601-aa07-7e40c905974c (OAI)
Merknad
Validerad; 2014; Nivå 2; 20141128 (andbra)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2019-11-22bibliografisk kontrollert
Organisasjoner
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0003-4505-4590