Simultaneous Determination of Ternary Mixture of Carboxin, Chlorpyrifos, and Tebuconazole Residues in Cabbage Samples Using Three Spectrophotometric Methods

Figure 4

The coincident spectra of the first derivative of the ratio spectra of (a) 5 μg/mL pure CHL (^___) and 5 μg/mL CHL in a ternary mixture (-----), and (b) 50 μg/mL pure CHL (^___) and 50 μg/mL CHL in a ternary mixture (-----) in methanol using 5 μg/mL CAR +5 μg/mL TEB as a double divisor at Δλ = 4.