Figure 3: The coincident spectra of the convoluted ratio spectra using combined trigonometric Fourier functions of: (a) ) MEH (10 µgml-1) and ternary mixture (10 µgml-1 MEH , 15 µgml-1 DF and 20 µgml-1 MET), (b) DF (12 µgml-1) and ternary mixture (µgml-1 MEH , 12 µgml-1 DF and 8 µgml-1 MET), (c) MET (20 µgml-1) and ternary mixture (10 µgml-1 MEH , 15 µgml-1 DF and 20 µgml-1 MET).