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- W2078476253 abstract "The effect of dissolved O2 on the chemical transformations of Fe, Mn, Zn, Cu, Pb, Cd, NH4+ -N and P in an estuarine sediment suspension was investigated under laboratory conditions. Reduced sediment suspensions were constantly purged with a gas mixture containing 0.11%, 2.1% and 21% O2 at a flow rate of 20 ml min−1. Suspension samples were taken at various time intervals and extracted for different chemical fractions. The data indicate that increasing O2 concentrations in the gas mixture resulted in lower sediment pH and higher oxidation-reduction potential (redox potential) with time. Changes in redox potential and pH strongly modified the distribution of trace metals in various chemical fractions. The hydroxylamine hydrochloride extraction failed to selectively remove oxides and hydroxides of Mn without dissolving a substantial proportion of reactive Fe, as the recovery of Fe by this extractant was 8 to 10 orders of magnitude greater than Mn. The large recovery of Fe with Mn in this fraction makes it difficult to distinguish trace metals associated with Mn oxides from those associated with Fe oxides. A substantial fraction of total sediment Zn was associated with potentially bioavailable chemical forms, which may be mobilized to more readily available forms due to changes in the physicochemical properties of the sediment-water system. Significant correlation coefficients obtained between soluble Pb, Cd and Cu and different Fe fractions suggest a strong relationship between these trace metals and Fe compounds. Phosphorus and NH4+ -N concentrations decreased sharply with time as a result of increased redox potential levels in the 2.1% and 21% O2 levels. The effect of the 0.11% O2 treatment was negligible. This indicates that oxidized sediment conditions may be an important factor in regulating eutrophication by reducing the levels of P and N available for biota. This necessitates a careful study of changes in the dissolved O2 concentration (reflected by redox potential levels) in the sediment-water system." @default.
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- W2078476253 date "1978-01-01" @default.
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- W2078476253 title "Effect of dissolved oxygen on chemical transformations of heavy metals, phosphorus, and nitrogen in an estuarine sediment" @default.
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- W2078476253 doi "https://doi.org/10.1016/0302-3524(78)90039-7" @default.
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