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- W2037541330 abstract "The oxidation and acidification of sulfidic soil materials results in the re-partitioning of metals, generally to more mobile forms. In this study, we examine the partitioning of Fe, Cr, Cu, Mn, Ni and Zn in the acidified surface soil (0-0.1 m) and the unoxidised sub-soil materials (1.3-1.5 m) of an acid sulfate soil landscape. Metal partitioning at this acidic site was then compared to an adjacent site that was previously acidified, but has since been remediated by tidal re-inundation. Differences in metal partitioning were determined using an optimised six-step sequential extraction procedure which targets the labile, acid-soluble, organic, crystalline oxide, pyritic and residual fractions. The surficial soil materials of the acidic site had experienced considerable losses of Cr, Cu, Mn and Ni compared to the underlying parent material due to oxidation and acidification, yet only minor losses of Fe and Zn. In general, the metals most depleted from the acidified surface soil materials exhibited the greatest sequestration in the surface soil materials of the tidally remediated site. An exception to this was iron, which accumulated to highly elevated concentrations in the surficial soil materials of the tidally remediated site. The acid-soluble, organic and pyritic fractions displayed the greatest increase in metals following tidal remediation. This study demonstrates that prolonged tidal re-inundation of severely acidified acid sulfate soil landscapes leads to the immobilisation of trace metals through the surficial accumulation of iron oxides, organic material and pyrite." @default.
- W2037541330 created "2016-06-24" @default.
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- W2037541330 date "2011-11-01" @default.
- W2037541330 modified "2023-10-16" @default.
- W2037541330 title "Partitioning of metals in a degraded acid sulfate soil landscape: Influence of tidal re-inundation" @default.
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- W2037541330 doi "https://doi.org/10.1016/j.chemosphere.2011.07.013" @default.
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