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- W2023978505 abstract "One-dimensional diffusive phosphate transport in a porous cation-exchange resin model system was investigated to examine the effect of exchangeable Al on the movement of phosphate. This study presumes that Al interacts with phosphate and H + is produced as a result of deprotonation of H 2 PO 4 − . The production of H + due to interactions between positively charged Al ions and phosphate ions was confirmed by measuring the pH change during the titration of phosphate by aluminum or aluminum by phosphate ions. A set of cylindrical wax columns packed with: (A) a mixture of sand and solid Al 2 O 3 , (B) a mixture of sand and Al 3+ -saturated cation-exchange resin, (C) a mixture of sand, solid Al 2 O 3 , and Al 3+ -saturated cation-exchange resin, and (D) sand as a control was used. A 0.2-g sample of 32 P-KH 2 PO 4 was applied on the surface of the mixture in each column simulating one-dimensional diffusion from an instantaneous planar source into a semi-finite system. Retardation of phosphate transport by exchangeable Al 3+ was characterized by lowering of pH. Phosphate transport was not retarded in the presence of solid Al 2 O 3 alone. Phosphate movement was further retarded in the presence of exchangeable Al 3+ with solid Al 2 O 3 . Under this situation, H + ion produced from precipitation reactions dissolved solid Al 2 O 3 , giving rise to more Al 3+ in solution. Aluminum ion in the solution phase moved towards the site where phosphate was precipitated. From a mass balance of P, a slight amount of P was not recovered in the system whose pH was kept around 2.0 or below, indicating a probable formation of K-taranakite. Either K-taranakite or K 2 Al 5 H 7 (PO 4 ) 8 −14 H 2 O was identified as a final precipitation product from a series of titration experiments. However, at least two unidentified morphologically different amorphous aluminum phosphates were observed. Key words: Aluminum, cation-exchange, phosphate, precipitation, retardation, transport" @default.
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- W2023978505 date "2000-11-01" @default.
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- W2023978505 title "Diffusive phosphate transport in Al-rich acidic porous cation exchange system" @default.
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- W2023978505 doi "https://doi.org/10.4141/s99-113" @default.
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