Solid-liquid phase equilibria of quaternary system NH 4 + //C1 − , SO 4 2− , H 2 PO 4 − -H 2 O and its subsystems NH 4 + //C1 − , SO 4 2− -H 2 O, NH 4 + //C1 − , H 2 PO 4 − -H 2 O at 313.15 K He, T.; Sun, J.; Shen, W.; Ren, Y.; The Journal of Chemical Thermodynamics 2017, 112, 31-42