Study on the Phosphorus Immobility of the Re-suspended Sediments

The variation of EPC0s of the re-suspended sediments is studied and the relationship between the distribution of phosphorus forms and EPC0s of sediments is investigated. Results of this study show that sediment re-suspension could promote phosphorus migration from overlying water to the sediments. The EPC0 of the re-suspended sediments reduced evidently from 0.069mg•L-1 (the initial state) to 0.034mg•L-1, whereas the values of the sediments without re-suspension increased slightly from 0.069mg•L-1 (the initial state) to 0.071mg•L-1 (the control experiment) and 0.073 mg•L-1 (aerating to water), respectively. The EPC0s of the sediments had remarkable positive correlation with the concentrations of various phosphorus forms (BD-P+Al-P+NaOH-nrP) in those sediments except for the re-suspended sediments. It was suggested that the characteristics of BD-P, Al-P and NaOH-nrP formed under sediment re-suspension was different evidently from the initial state.

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