Table 1: Factors and levels for Taguchi orthogonal array design of proposed method (A–E are the respective codes for each factor).

Levels Factors
A (pH)B (surfactant (%))C (ionic strength (mol L−1))D (temperature (°C))E (organic solvent volume (µL))

130.050.013050
240.10.14075
350.20.2550100
460.30.560125