| Reference solution | Lower butyric acid conc. | Lower acetone conc. | Lower ethanol conc. |
Butyric acid (g/L) | 7.47 ± 0.23 | 3.30 ± 0.14 | 6.98 ± 0.22 | 6.79 ± 0.21 |
Acetone (g/L) | 13.83 ± 0.28 | 13.64 ± 0.28 | 10.74 ± 0.25 | 13.45 ± 0.31 |
Ethanol (g/L) | 12.61 ± 0.11 | 12.87 ± 0.11 | 12.91 ± 0.11 | 8.30 ± 0.07 |