Table 1. Concentration of the aqueous citric acid solutions used in this study.
| Solution | Concentration (mg/mL) |
|---|---|
| 10 | 360 |
| 9 | 180 |
| 8 | 90 |
| 7 | 45 |
| 6 | 22.5 |
| 5 | 11.3 |
| 4 | 5.63 |
| 3 | 2.81 |
| 2 | 1.41 |
| 1 | 0.70 |
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