Table 3. Cyclic voltammetric parameters of binary mixture of DA and AA obtained for modified electrodes with constant concentration of DA (0.085 mM) and increasing concentration of AA (0.031, 0.058, 0.081, 0.1, 0.12, 0.13, 0.14, 0.16, 0.17, 0.18 mM).

Fabricated GC electrodes	Anodic peak potentials (V)		Peak potential separation (V)
	AA	DA
MWCNT/Fe3O4/2,3-Nc	−0.01	0.202	0.192
MWCNT/Fe3O4/29H,31H-Pc	−0.022	0.189	0.167
MWCNT/ZnO/2,3-Nc	0.021	0.218	0.197
MWCNT/ZnO/29H,31H-Pc	0.024	0.218	0.194