PBS recipe 1X Phosphate Buffered Saline (PBS Buffer) Recipe Dissolve in 800ml distilled H2O: 8g of NaCl 0.2g of KCl 1.44g of Na2HPO4 0.24g of KH2PO4 Adjust pH to 7.4 with HCl. Adjust volume to 1L with distilled H2O. Sterilize by autoclaving.