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Preparation of stock solutions (a mixture of phosphoric acid, DMSO and methanol) with different pH for testing HKUST in acid etching.
| Stock solution (SS) | SS + 1 ml H3PO4 (SSH) | SS + 0.6 ml H3PO4 | SS + 0.2 ml H3PO4 | SS + 1 ml SSH | SS + 0.6 ml SSH | SS + 0.2 ml SSH | |
|---|---|---|---|---|---|---|---|
| pH | 6.4 | 2.6 | 2.8 | 3.1 | 3.6 | 4.0 | 4.5 |
