Super phosphate 313 -saturation

Figure 5 shows the effect of phosphate concentration on crystallization rate Rg. Crystallization rate was obtained by weighing seeds in the reactor periodically, in which phosphate concentration drop in the bed was low enough, not to produce concentration distribution, by making the depth of the bed thin. Solubility of hydroxyapatite is so low, that the influent phosphate concentration is equal to super saturation dC. As shown in Figure 5, crystallization rate was proportional to 1.1th order of supersaturation. 

Micelles in bovine milk contain physiologically significant amounts of calcium and phosphorous because of phosphorylated seryl residues in asl-, aS2- and (3-casein. These casein phosphopeptide (CPP) fragments help to create thermodynamically stable casein micelles super-saturated with calcium and phosphate, thus contributing to the stability of milk during... 

TTie above observations obey the Gay-Lussac Law which states that a compound that crystallises from a highly super-saturated solution first is the most soluble (from a saturated solution first it is the least soluble). In the above case, amorphous (2) is more soluble than (1). By choice of crystal habit modifier, it is possible to preferentially precipitate one form of the phosphate. 

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