Research Article
Three Different Spectrophotometric Methods for Simultaneous Determination of Pyriproxyfen and Chlorothalonil Residues in Cucumber and Cabbage Samples
Table 3
Percentage mean recovery of pyriproxyfen and chlorothalonil in real cucumber samples by proposed methods.
| Pyriproxyfen | Fortification level (μg·mL−1) | 1st and 2nd derivatives | Ratio spectra derivative | Mean centering of ratio spectra | 1D281.80 nm | 2D281.40 nm | 2D285.60 nm | 1DD272 nm | 1DD286 nm | 278 nm | %R | %RSD | %R | %RSD | %R | %RSD | %R | %RSD | %R | %RSD | %R | %RSD |
| 3.0 | 88.32 | 3.83 | 86.85 | 4.59 | 88.50 | 4.03 | 88.06 | 4.95 | 89.28 | 3.62 | 88.00 | 4.56 | 20.0 | 94.72 | 2.78 | 93.41 | 2.73 | 94.16 | 3.13 | 94.40 | 3.19 | 95.24 | 2.48 | 93.87 | 2.17 | 30.0 | 96.27 | 2.18 | 96.42 | 2.20 | 94.86 | 2.44 | 94.73 | 2.32 | 96.39 | 1.92 | 95.14 | 2.15 |
| Chlorothalonil | Fortification level (μg·mL−1) | 1st and 2nd derivatives | Ratio spectra derivative | Mean centering of ratio spectra | 1D329.20 nm | 2D262.60 nm | 2D266 nm | 1DD228 nm | 1DD262 nm | 254 nm | %R | %RSD | %R | %RSD | %R | %RSD | %R | %RSD | %R | %RSD | %R | %RSD |
| 1.0 | 90.47 | 4.38 | 88.04 | 4.81 | 82.24 | 5.11 | 81.51 | 5.45 | 90.32 | 4.63 | 87.37 | 4.43 | 4.0 | 95.39 | 2.19 | 94.84 | 3.41 | 94.06 | 3.09 | 91.32 | 4.43 | 95.30 | 2.70 | 95.93 | 3.10 | 7.0 | 97.04 | 2.24 | 95.15 | 3.76 | 95.88 | 2.10 | 91.36 | 3.17 | 96.85 | 2.23 | 96.44 | 3.00 |
|
|