PB=Sodium phosphate buffer.
根据厂家，浓度可以不同：
0.1 M
NaH2PO4 * H2O 3.1 g
Na2HPO4 (anhydrous) 10.9 g
Distilled water to make a total volume of 1 liter. The pH of the final solution will be 7.4. This buffer can be stored for up to 1 month in 4°C.
0.2 M
NaH2PO4 * 2 H2O 5.93 g
Na2HPO4 (anhydrous) 23.0 g
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