الفهرس | Only 14 pages are availabe for public view |
Abstract The mechanism of crystallization of COM crystals at conditions simulating to artificial urine was studied. XRD, FTIR, SEM, SSA and EDX techniques have been used to elucidate the structure of prepared crystals. The crystallization rates of COM crystals carried out at 37 oC, I = 0.3 mol.dm-3, pH = 5.5, ɣ = 0.4 and the reaction experiment initiated using 0.01 g of seed crystals in each experiment. The order of crystallization of COM crystals at experimental condition was ~ 2, which suggests surface-controlled mechanism. The effect of fluid dynamics on the rates of crystallization of COM crystals and the lower value of Ea ( 0.95634 J / mole), supported the surfacecontrolled mechanism. The rates of crystallization of COM crystals were increased by increasing the values of ionic strength of the medium. Increasing the values of pH of the medium, increased the crystallization rates of COM crystals till pH = 8, after it, the rates decreased with increasing pH values. The effect of concentrations of urine components using concentrations of components similar to that of artificial urine was studied. |