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Trace metal occurrence in a mineralised and a non-mineralised Spodosol in northern Sweden
Stockholm University, Department of Geology and Geochemistry.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
2002 (English)In: Journal of Geochemical Exploration, ISSN 0375-6742, E-ISSN 1879-1689, Vol. 75, no 1-3, p. 71-91Article in journal (Refereed) Published
Abstract [en]

In order to determine the metal-bearing phases with special emphasis on Cu, a sequential extraction has been carried out on seven soil samples from a sulphide-bearing spodosol profile in Liikavaara Ostra, close to the Aitik Copper Mine in northern Sweden. A reference spodosol profile with very low abundances of sulphides located far from anthropogenic emissions was also studied. Five fractions were selected for the extraction: (I) CH (sub 3) COONa-extractable (exchangeable/adsorbed/carbonate); (II) Na (sub 4) P (sub 2) O (sub 7) -extractable (labile organics); (III) 0.25 M NH (sub 2) OH.HCl-extractable (amorphous Fe oxyhydroxides/Mn oxides); (IV) 1 M NH (sub 2) OH.HCl-extractable (crystalline Fe oxides); and (V) KClO (sub 3) /HCl-extractable (organics and sulphides). The distribution of trace elements (Co, Cr, Cu, Ni, Pb and Zn) in the profile in Liikavaara Ostra is different from that in the reference profile. Possible explanations for these differences are (i) the presence of sulphides in the soil, (ii) atmospheric deposition of dust derived from mining activities at the Aitik Copper Mine, and (iii) mineralogical heterogeneities inherited from the deposition of the till. There is no straightforward correlation between the amount of the extracted phases and the metal extractability in the soils. This fact indicates that other factors are important for the retention of trace metals as well. The data presented in this study suggest that Co, Cr and Ni, to a fairly large extent, are associated with the organic matter in the B-horizon in both profiles, while in the C-horizon in Liikavaara Ostra, sulphides are probably the more important carriers of these elements. For Co and Ni, Fe oxyhydroxides seem to be important. Most of the Cr occurred in the residual remaining after the leaching procedure. Copper and Zn seem to be associated with the organic matter to some extent in the B-horizon. The concentration of Cu in the C-horizon in Liikavaara Ostra is high (2310 ppm), but only a very small fraction is likely to be hosted by sulphides. It is concluded that the major part of Cu in the C-horizon and a prominent fraction in the B-horizon in Liikavaara Ostra are associated with some secondary phase that is extractable during extractions III and IV. Possible candidates for this phase are goethite and inclusions of native Cu in weathered biotite

Place, publisher, year, edition, pages
2002. Vol. 75, no 1-3, p. 71-91
National Category
Geochemistry
Research subject
Applied Geology
Identifiers
URN: urn:nbn:se:ltu:diva-11385DOI: 10.1016/S0375-6742(02)00197-8ISI: 000176053100004Scopus ID: 2-s2.0-0036564268Local ID: a55ed570-74f8-11dd-a03a-000ea68e967bOAI: oai:DiVA.org:ltu-11385DiVA, id: diva2:984335
Note
Validerad; 2002; 20080828 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Öhlander, Björn

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