Results of HPLC-PDA method for different soil samples.
| Phenolic acid | Chuju soil (μg g−1) | Chuju replant soil (μg g−1) | Paddy soil (μg g−1) | Peanut soil (μg g−1) | Cucumber soil (μg g−1) |
|---|---|---|---|---|---|
| Gallic acid | ND | ND | 1.26 ± 0.21 | ND | ND |
| Protocatechuic acid | 0.40 ± 0.08 | 1.52 ± 0.09 | ND | 0.21 ± 0.002 | ND |
| p-Hydroxybenzoic acid | 1.08 ± 0.17 | 0.01 ± 0.001 | 0.18 ± 0.03 | 0.24 ± 0.02 | 1.25 ± 0.05 |
| Chlorogenic acid | ND | 0.29 ± 0.0004 | ND | ND | 0.56 ± 0.003 |
| Vanillic acid | 0.99 ± 0.13 | 12.37 ± 0.12 | 0.67 ± 0.02 | 1.50 ± 0.23 | 1.49 ± 0.56 |
| Caffeic acid | 0.17 ± 0.03 | 0.71 ± 0.20 | ND | ND | ND |
| Syringic acid | 0.40 ± 0.08 | 4.35 ± 0.21 | 0.43 ± 0.001 | ND | 0.31 ± 0.02 |
| p-Coumaric acid | 1.97 ± 0.29 | 3.86 ± 0.56 | 2.11 ± 0.73 | 0.14 ± 0.001 | 0.16 ± 0.05 |
| Ferulic acid | 0.58 ± 0.11 | 3.09 ± 0.24 | ND | ND | ND |
| Benzoic acid | 0.82 ± 0.04 | 19.90 ± 1.21 | ND | 6.75 ± 0.24 | 24.41 ± 1.23 |
| Salicylic acid | ND | 14.73 ± 0.81 | ND | ND | 0.44 ± 0.01 |
| Cinnamic acid | ND | 6.33 ± 0.29 | 0.17 ± 0.01 | 0.91 ± 0.12 | 0.02 ± 0.001 |
| 3-Methoxycinnamic acid | ND | 11.66 ± 0.34 | 1.26 ± 0.24 | 0.24 ± 0.02 | 0.25 ± 0.02 |
| 2-Methoxycinnamic acid | ND | 9.02 ± 0.48 | 1.42 ± 0.34 | ND | ND |