|
| 70% ethanol pre-treatment (5min treatment) | Amount of persulfuric acid (completed to 25 ml with deionized water, 10 min treatment) 2 V | 70% ethanol final treatment |
| A | − | 1 mL | + |
| B | − | 2.5 mL | + |
| C | − | 5 mL | + |
| D | − | 10 mL | + |
| Aeth | + | 1 mL | + |
| Beth | + | 2.5 mL | + |
| Ceth | + | 5 mL | + |
| Deth | + | 10 mL | + |