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- W2531370595 abstract "Excessive phosphorus (P) input plays an important role on the release of heavy metals in sediments under the eutrophic environment. In this study, a microcosm experiment with 40-day incubation using homogenized sediments was performed to investigate this aspect at a millimeter resolution. Diffusive gradient in thin films (DGT) and dialysis (Peeper) techniques were employed to simultaneously measure labile and dissolved P, Pb, Cd, Zn, Co and Ni in sediments at a millimeter scale, respectively. The results showed that an increase of water P from 0.02mgL-1 to 0.20 and 2.4mgL-1 generally led to intensified decrease of DGT-labile metals from the 10th to 20th days after the onset of incubation. The decrease in dissolved metals in pore water also appeared on the 20th day. The degree of decrease in the five metals was in the order of Pb>Cd>Zn>Co>Ni, which has a negative correlation with the solubility constants (Ksp) of each metal-P precipitate. This indicated that the negative effect was caused by the precipitation of metal P. On the 40th day during incubation, the concentrations of DGT-labile metals had different increasing pattern compared to those on the 20th day. The extent of metal recovery was positively correlated with the change of desorption rate constant (k-1) and negatively correlated with the change in the characteristic time (Tc) to reach equilibrium from DGT perturbation derived from DGT-induced fluxes in sediments (DIFS) modeling. This suggested that the recovery of metal lability from elevated water P was a result of the increased releases of metals from sediment solids." @default.
- W2531370595 created "2016-10-21" @default.
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- W2531370595 date "2017-01-01" @default.
- W2531370595 modified "2023-10-17" @default.
- W2531370595 title "An investigation of the effects of elevated phosphorus in water on the release of heavy metals in sediments at a high resolution" @default.
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- W2531370595 doi "https://doi.org/10.1016/j.scitotenv.2016.10.063" @default.
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