Table 1.

pH, peak potential values (Oxidation—E_ox; Reduction—E_red), peak current values (Oxidation—I_p^ox; Reduction—I_p^red) and half-wave potential values (E_1/2) at a scan rate of 50 mV/s for Au and Pt electrodes obtained from the CV curves recorded using [Fe(CN)₆]^3−/4− redox couple for various sweat and saliva bio-mimic solutions studied in this work.

Electrolyte	pH	Peak potentials (mV)				Peak currents (× 10–5 A)				E1/2 (mV)
		Au		Pt		Au		Pt		Au	Pt
		Eox	Ered	Eox	Ered	Ipox	Ipred	Ipox	Ipred
Fe2+/3+	7.3	141	05	119	12	5.5	− 5.2	5.8	− 5.7	136	107
Sweat + Fe2+/3+	6.6	135	02	139	22	5.8	− 5.2	5.4	− 5.2	133	117
Sweat + Fe2+/3+  + Triton X-100	5.9	144	28	126	25	1.3	− 1.2	1.4	− 1.3	116	101
Saliva + Fe2+/3+	6.2	265	134	261	147	5.8	− 5.1	6.2	− 5.3	131	114
Saliva + Fe2+/3+  + Triton X-100	5.5	191	33	164	10	1.4	− 1.2	1.0	− 1.0	158	154
Real sweat sample analysis	6.5	133	03	137	25	5.7	− 5.1	5.3	− 5.1	130	112