| Recovery of Total Citric Acid by HPLC | ||
| % Level | Citric Acid | |
| Amount Added (µg/mL) | Average % Recovery | |
| 50 | 300 | 98.5 |
| 75 | 450 | 99.7 |
| 100 | 600 | 99.4 |
| 125 | 749 | 99.6 |
| 150 | 899 | 99.0 |
| Overall Avg. % Recovery | 99.3 | |
| Overall % RSD | 0.6 | |