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Determination of the metastable zone width and induction period of urea phosphate. The effects of saturation temperature, cooling rate, stirring rate, and impurity ions on the width of metastable region of urea phosphate crystals and the effect of supersaturation on its induction period were studied. The results show that the width of the crystallization metastable zone narrows with the increase of the saturation temperature, the stirring rate, and the decrease of the cooling rate. The apparent nucleation series m is calculated to be 1.021. The crystallization induction period becomes shorter as the increasing supersaturation S. Impurity ions increase the width of the metastable zone of phosphoric acid. F -  has the most significant effect on the width of the metastable zone, and the effect of SO 4  2-  is relatively weakest.

Determination of the Metastable Zone and Induction Period of Urea Phosphate Solution