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- W178017939 abstract "Phosphate concentrations in natural waters have been of increasing concern because if they are too low they may hinder forest and agricultural growth, but if they are too high they may lead to eutrophication [1]. Thermodynamic calculations suggest that the Al and Fe phosphates, variscite and strengite, control aqueous phosphate concentrations in acidic (pH<7) environments [2]. This study is aimed at assessing experimentally the role of these minerals in controlling phosphate availability in natural waters. The formation and dissolution of Al and Fe-phosphate phases were investigated experimentally at 25°C to 200°C and 1.5<pH<9. Solids were characterized by XRD, FTIR, FEGSEM and HR-TEM, and Al, Fe, and P in solution were analysed by ICP-AES, IC and UV-Vis. Batch reactor experiments show that Al and Fe phosphate phases readily precipitate from supersaturated solutions. Precipitation is iniated by the nucleation and growth of amorphous Al or Fe phosphates (AAP and AFP, respectively). At T=100°C the amorphous phosphates recrystalize into either variscite (V) and metavariscite (MV), or strengite, respectively. At lower T, amorphous phosphates persist for at least several months. Dissolution experiments demonstrate these phases rapidly dissolve in undersaturated solutions. These results suggest that amorphous Al and Fe phosphates limit P availability in many natural environments." @default.
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- W178017939 date "2009-06-01" @default.
- W178017939 modified "2023-10-17" @default.
- W178017939 title "Which trivalent phosphate controls acidic surface water P availability" @default.
- W178017939 hasPublicationYear "2009" @default.
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