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- W2350111704 abstract "Monoammonium phosphate(1 mol L^-1),monopotassium phosphate(1 mol L^-1) and aluminum chloride(5×10^-3molL^-1)were used to investigate the influence of pH on the formation of NH4-taranakite and K-taranakite in systems with a high NH4H2PO4 or KH2PO4 concentration.The experimental data indicated that the reaction products of aluminum with NH4H2PO4 or KH2PO4 changed with the pH in the systems.In a pH range of 2.5 to 10.0,as the pH increased,the products in either ammonium or potassium system followed the sequence:taranakite,amorphous(NH4,K)2AIH(PO4)2.4H2O,and then crystalline (NH4,K)AlPO4OH.2H2O.However,the pH ranges of the formation of these products in ammonium system were different from potassium system.NH4-taranakite formed from pH 2.75 to pH 5.75,whereas K-taranakite formed in the pH range of 3.00 to 5.0,From the theoretical calcuation by a computer program (GEOCHEM version 2.0) ,NH4-taranakte and K-taranakite could form at the pH from 1.50 to 8.30 and from 1.25to 8.45,respectively.These pH ranges were much wider than the experimental results.The difference between the experimental data and theoretical data was attributed to the lack of kinetic data and /or the incompleteness and inaccuracy of the thermodynamic data in the data base of the program.The pH ranges of the formation of the taranakites indicated that the taranakites could exist in the immediate vicinity of phosphate ferilizer zone as reaction products of phosphate fertilizers with soils,especially acideic soils,resulting in the fixation of not only phosphate but also nitrogen and /or potassium in soils." @default.
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- W2350111704 date "1999-01-01" @default.
- W2350111704 modified "2023-09-24" @default.
- W2350111704 title "Influence of pH on Formation of Taranakites" @default.
- W2350111704 hasPublicationYear "1999" @default.
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