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- W2107383886 abstract "The bioavailability of heavy metals in sediments may be strongly decreased by the presence of AVS (acid-volatile sulfide). In contaminated freshwater sediments, however, AVS levels may not be sufficiently high to scavenge all reactive heavy metals. In different seasons, the vertical distribution of AVS and SEM (simultaneously extracted metals) was studied in sediment cores of a recent sedimentation area of the river Meuse. In the suboxic layer of the sediments, the amount of AVS is always too low to bind all reactive metals as sulfides (SEM/AVS > 1). SEM/AVS decreases with depth in the sediments, going from ratios higher than one in the surface sediments to ratios on the order of one or even less than one at greater depths. This large vertical variation in AVS levels is attributed to diagenetic processes i.e., sulfide oxidation in the suboxic top layer and sulfate reduction in the underlying anoxic sediment layer. The depth of the boundary between the suboxic and the anoxic layer changes seasonally. An important implication of these findings is that SEM/AVS ratios in mixed homogenized sediment samples are generally not suited for the assessment of potential metal toxicity of sediments." @default.
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- W2107383886 date "1998-04-01" @default.
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- W2107383886 title "Vertical distribution of acid-volatile sulfide and simultaneously extracted metals in a recent sedimentation area of the river Meuse in the Netherlands" @default.
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- W2107383886 doi "https://doi.org/10.1002/etc.5620170433" @default.
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