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Tracing Pb Pollution Penetration in Temperate Podzols
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap. Department of Archaeology, University of York, Kings Manor YO1 7EP York, UK.
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2017 (engelsk)Inngår i: Land Degradation and Development, ISSN 1085-3278, E-ISSN 1099-145X, Vol. 28, nr 8, s. 2432-2445Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We combine high-resolution soil sampling with lead (Pb) analyses (concentrations and stable isotopes) in two temperate podzols, together with previous data obtained with selective Al and Fe dissolution techniques. We aim to assess how atmospheric Pb is incorporated into the soils during pedogenesis. Partial least squares modelling for Pb concentrations shows that the podzolization process has the largest effect on Pb concentration (803% of the variance). The proportion of inorganic secondary compounds, the input of fresh organic matter from the soil surface and the relative abundance of Fe versus Al are responsible for a small part of the Pb concentration variance. Lead isotopic composition (Pb-206/Pb-207 ratios) depends on soil organic matter content either fresh/poorly humified (573% of the variance) or humified (247% of the variance). The Pb linked to inorganic compounds and the overall podzolization process play a minor role in isotopic signature (53 and 37% of the variance respectively). Soil pH appears to be the controlling variable of the different transport and retention mechanisms. The relatively low isotopic ratios observed in spodic horizons result from geogenic Pb released through the preferential dissolution of the isotopically distinct most weatherable minerals of the parent material in the eluvial horizons, which undergoes downward mobilization. An accurate knowledge of soil reactive components and formation mechanisms is essential to a correct diagnose of the scope of Pb pollution and a more effective design of remediation strategies.

sted, utgiver, år, opplag, sider
John Wiley & Sons, 2017. Vol. 28, nr 8, s. 2432-2445
Emneord [en]
lead isotopes, atmospheric deposition, partial least squares modelling, podzols
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Identifikatorer
URN: urn:nbn:se:umu:diva-141968DOI: 10.1002/ldr.2777ISI: 000414626400009OAI: oai:DiVA.org:umu-141968DiVA, id: diva2:1163329
Tilgjengelig fra: 2017-12-06 Laget: 2017-12-06 Sist oppdatert: 2018-06-09bibliografisk kontrollert

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