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Absolute and relative recoveries (%) for the overall extraction procedures
| Compound | Entire sample preparation method | |
|---|---|---|
| Absolute, % | Relative, % | |
| Acetaminophen | 102 | 95 |
| Caffeine | 103 | 96 |
| Acetylsalicylic acid | 60 | 56 |
| Ibuprofen | 78 | 73 |
| Diclofenac sodium salt | 86 | 81 |
| Acetaminophen-d4 | 107 | 100 |
