Three Different Spectrophotometric Methods for Simultaneous Determination of Pyriproxyfen and Chlorothalonil Residues in Cucumber and Cabbage Samples

Figure 4

Second-order derivative spectra of (a) 10.0 μg·mL⁻¹ of pyriproxyfen, (b) 3.0 μg·mL⁻¹ of chlorothalonil, and (c) their mixture in methanol.