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Table 1 The saturation indices (SI) of the different compounds in the PEM medium by pH 8.5, 25 °C treatment were predicted with Visual MINTEQ software

From: Pre-concentration of microalga Euglena gracilis by alkalescent pH treatment and flocculation mechanism of Ca3(PO4)2, Mg3(PO4)2, and derivatives

Compounds lgIAP lgKsp SIa
Ca10(PO4)6(OH)2 − 20.90 − 44.33 23.43b
Ca4H(PO4)3·3H2O − 34.33 − 47.95 13.63b
β-Ca3(PO4)2 − 18.41 − 28.92 10.51b
am2-Ca3(PO4)2 − 18.41 − 28.25 9.84b
Mg3(PO4)2 − 14.08 − 23.28 9.20b
am1-Ca3(PO4)2 − 18.41 − 25.50 7.09b
MgHPO4·3H2O − 14.47 − 18.18 3.70b
CaHPO4 − 15.92 − 19.28 3.36b
CaHPO4·2H2O − 15.92 − 19.00 3.08b
Mg(OH)2 14.87 18.79 − 3.93c
MgO 14.87 21.58 − 6.72c
Ca(OH)2 13.42 22.70 − 9.28c
CaO 13.42 32.70 − 19.28c
  1. aSI saturation index = lgIAP − lgKsp; bSI > 1, oversaturation; cSI < 1, undersaturation; IAP ion activity product, KSP solubility product constant