PO4 BUFFER (0.1 M, PH 7.3)

80 ml 0.1 M Na2HPO4 (13.8 g Na2HPO4⋅H2O/liter dH2O)
20 ml 0.1 M NaH2PO4 (26.8 g NaH2PO4⋅7H2O/liter dH2O)