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Multi-element features of active acid sulfate soils across the Swedish coastal plains by Alexandra Nyman; Anders Johnson; Changxun Yu; Mark Dopson; Mats Åström is a Environmental Science article available to read on EtoBox.

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Acid sulfate soils are sulfide-rich soils with notable associated environmental risks. The low pH of these soils mobilizes metals from the soil minerals, which will lead to both acidification and metal contamination of the surrounding environment. This paper presents the results of a geochemical study of 66 profiles of acid sulfate soils collected from a total of 22 sites (three profiles for each site) on the Swedish coastal plains, which stretch for some 2000 km along the Baltic Sea and Kattegat. The reduced zone at the bottom of the profiles was characterized by pH frequently >6.0, the transition zone (above the reduced zone) by a steep pH gradient from near-neutral to weakly acidic, and the oxidized zone located above the transition zone by highly acidic conditions with a pH minimum <4.0. Each zone in each profile was sampled for geochemical analyses. The aqua regia extractable S concentrations ranged widely in the reduced zone (0.06–7.5%) and were strongly depleted in the oxidized zone (median decrease 69%) from extensive sulfide oxidation and associated severe acidification and sulfate leaching. In addition to S, there were significant losses from the oxidized zone of eight al

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Author

Alexandra Nyman; Anders Johnson; Changxun Yu; Mark Dopson; Mats Åström

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Environmental Science (Physical Sciences)