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Composition of buffer solutions used in permeation experiments and chemical stability measurements.
| pH | Buffer type | Concentration | |
| 3 | acetate | 0.139 M CH3COOH | 0.04 M CH3COONa |
| 4.5 | 0.065 M CH3COOH | 0.096 M CH3COONa | |
| 6 | – | 0.12 M NaCl | – |
| 6.5 | phosphate | 0.026 M KH2PO4 | 0.033 M Na2HPO4 |
| 7.6 | 0.007 M KH2PO4 | 0.044 M Na2HPO4 | |
| 9 | carbonate-bicarbonate | 0.09 M NaHCO3 | 0.01 M Na2CO3 |
