Leong, Y.K. , Sganzerla, M., Berndt, C.C. , and Campbell, G.R. (2008) Metal ions solubility in plant phosphoric acid: degree of ammonia neutralization and temperature effects. Industrial & Engineering Chemistry Research, 47 (5). pp. 1380-1385.

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Abstract

The solubility of Fe(III), Al(III), Mg(II), Ca(II), and S in plant phosphoric acid was determined as a function of mole ratio of ammonia to phosphate (MR) and at temperatures of 25, 60, and 90 °C. For each metal ion, there is a unique MR characterizing the onset of a sharp decline in solubility and another characterizing the transition from sharp decline to a more gradual change. At any given temperature, these characteristic MR values generally increase with the following order: Ca(II) = Mg(II) > Al(III) > Fe(III). The temperature effects on the solubility behavior of these metal ions and S and the most likely cause(s) of such behavior were presented and discussed.

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