| Chemical | Final concentration | Amount to be added |
| NaCL (Sigma) | 137 mM | 8.0 g |
| KCl (Sigma) | 2.7 mM | 0.2 g |
| Na2HPO4 (Sigma) | 10 mM | 1.44 g |
| KH2PO4 (Sigma) | 1.8 mM | 0.24 g |
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