| Parameter | AP1 | AP2 | AP3 |
| Color | yellow | yellow | yellow |
| The pH range of education and extraction | 2.1 - 6.5 | 2.0 - 6.3 | 2.1 - 5.5 |
| The pH range of maximum extraction | 3.5 - 5.0 | 3.3 - 4.9 | 3.0 - 4.7 |
| Concentration of DTP: mol∙L−1 | 1.0 × 10−3 | 1.0 × 10−3 | 1.0 × 10−3 |
| Concentration of An: mol∙L−1 | 8 × 10−4 | 8 × 10−4 | 8 × 10−4 |
| Organic solvent | Chloroform | Chloroform | Chloroform |
| Extraction time | 3 min | 3 min | 3 min |
| λmax(nm) | 440 | 438 | 435 |
| Molar absorptivity (L∙mol−1∙cm−1) | 2.9 × 104 | 2.8 × 104 | 2.6 × 104 |
| Sandell’s sensitivity (µg∙cm−2) | 0.0032 | 0.0033 | 0.0035 |
| R, % | 97.9 | 97.8 | 97.6 |
| The equation of calibration curves | 0.023 + 0.30x | 0.025 + 0.29x | 0.038 + 0.27x |
| lgKe | 5.82 | 5.76 | 5.75 |
| lgKEx | 10.06 | 9.95 | 9.82 |
| Stability constant (β) | 8.4 | 8.3 | 8.2 |
| Beer’s law range (µg∙ml−1) | 0.05 - 4.0 | 0.05 - 3.8 | 0.06 - 3.8 |
| Correlation coefficient | 0.9985 | 0.9982 | 0.9975 |
| Limit of detection (LOD): ng∙mL−1 | 11 | 12 | 14 |
| Limit of quantification (LOQ): ng∙mL−1 | 36 | 40 | 45 |