Citrate–Phosphate Buffer (500 mm, pH 5.6)
| Na2HPO4 (anhydrous) | 71 g |
| Citric acid | 115 g |
| Dissolve in 1 liter of distilled water. (The final concentration of Na2HPO4 is 500 mm.) Adjust to pH 5.6 with 5 m NaOH. Sterilize by autoclaving. Store up to 6 mo at room temperature unless contamination is observed. | |










