formation of ternary complexes containing surfactant monomers,
which led to the micelles formation of high molar absorptivity and,
therefore, high sensitivity (Shokrollahi et al., 2008; Rodrigues et al.,
2005). It was found that the absorption spectrum of Al-ECR in the
presence of DTAB gave highest sensitivity and red shift to maximum
wavelength of 584 nm (Fig. 3). Therefore, DTAB was chosen as a
suitable surfactant for enhancing the sensitivity of Al-ECR.