Mobility and retention of heavy metals, arsenic and sulphur in podzols at eight locations in northern Finland and Norway and the western half of the Russian Kola Peninsula |
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| Authors: | Marja Liisa Räisänen Galina Kashulina Igor Bogatyrev |
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| Institution: | aGeological Survey of Finland, Box 1237, FIN-70211 Kuopio, Finland;bKola Science Centre, Institute of North Industrial Ecological Problems, Fersman St. 14, 184200 Apatity, Russia;cKola Geological Information and Laboratory Center, Apatity, Russia |
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| Abstract: | The mobility and retention of heavy metals, arsenic and sulphur in podzols from eight areas located north of the Arctic Circle in Finland, Norway and Russia were determined by analyzing the < 2.0 mm fraction, using an ammonium acetate (pH 4.5) extraction in addition to a concentrated nitric acid digestion for the humus samples, and a hot aqua regia digestion for the mineral soil samples. Total C, H and N concentrations were determined in humus and mineral soil samples with a CHN analyser.Ni, Cu, Co and As were strongly enriched in the humus layer in the contaminated sites (Monchegorsk, Kurka, Zapoljarnij) when compared to their concentrations in the parent tills and in podzols from the background sites. In most study sites the illuvial layer showed a low capacity to retain the metals and As, the exception included a strongly eroded profile at Monchegorsk, where Ni was tightly fixed in the illuvial layer while Cu was mobile. In contrast to metals, airborne S was not accumulated in the humus layer, but was accumulated in the illuvial layer, more markedly at eroded sites than in places where the humus was covered as at Monchegorsk. |
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| Keywords: | podzols geochemistry heavy metals arsenic sulphur mobility |
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