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- W1965189904 abstract "Phosphate (P i ) release due to Fe III oxide dissolution is well documented for soils undergoing reduction. The P i sorption properties of soils in anoxic conditions are, however, still under consideration. In this investigation, P i sorption to strictly anoxic soils was compared with oxic conditions to assess the potential of lowland soils to function as traps for P i when flooded with drainage water. Batch sorption experiments were performed on seven minerogenic soils. Sorption to the anoxic soils was conducted after anoxic incubation, resulting in reduction of 36 to 93% of the dithionite‐extractable Fe III (Fe BD ). Langmuir fitted P i sorption isotherms showed a P i release of up to 1.1 mmol kg −1 in six soils when P i concentrations in the matrix (P sol ) were lower than 10 μM. Phosphate desorption was attributed to dissolution of amorphous iron oxides, and higher pH under anoxic conditions. The point of zero net sorption (EPC 0 ) increased 2‐ to 10‐fold on reduction. Five soils showed higher P i sorption capacities in the anoxic than in the oxic state at higher P sol concentrations. Solubility calculations indicated that precipitation of vivianite or similar Fe II phosphates may have caused the higher sorption capacities. Use of maximum sorption capacity ( S max ) is therefore misleading as a measure of P i sorption at low P sol concentrations. The results demonstrate that none of the strongly anoxic soils, irrespective of the initial Fe III oxide content, the P saturation, and the degree of Fe III oxide reduction, could retain P i at natural P sol concentrations in agricultural drainage water." @default.
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- W1965189904 date "2010-03-01" @default.
- W1965189904 modified "2023-09-28" @default.
- W1965189904 title "A Comparative Study of Phosphate Sorption in Lowland Soils under Oxic and Anoxic Conditions" @default.
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- W1965189904 doi "https://doi.org/10.2134/jeq2009.0222" @default.
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