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

Figure 5

The coincident spectra of the first derivative of the ratio spectra of (a) 5 μg/mL pure TEB (^___) and 5 μg/mL TEB in a ternary mixture (-----), and (b) 45 μg/mL pure TEB (^___) and 45 μg/mL TEB in a ternary mixture (-----) in methanol using 5 μg/mL CAR +5 μg/mL CHL as a double divisor at Δλ = 2.