Table 2.

EIS parameters of MS in the presence of different concentrations of DPH in 1 M HCl solution.

Concentration (ppm)	Immersion time (h)	Rs (Ω cm2)	Rct (Ω cm2)	CPE		Cdl (µF cm−2)	η (%)	τ (s)	θEIS
				Y0 (µsn Ω−1 cm−2)	n
Blank	1	1.71 ± 0.01	46.75 ± 0.17	92.25 ± 1.82	0.9 ± 0.01	34.73	–	0.00162	–
	3	1.65 ± 0.01	72.84 ± 0.24	104.86 ± 1.34	0.89 ± 0.01	35.85	–	0.00261	–
	6	1.65 ± 0.01	77.88 ± 0.3	117.59 ± 1.78	0.89 ± 0.01	40.78	–	0.00317	–
	24	1.49 ± 0.01	60.04 ± 0.42	175.2 ± 4.12	0.9 ± 0.01	69.86	–	0.00419	–
250	1	1.51 ± 0.07	271.1 ± 4.21	63.6 ± 2.96	0.86 ± 0.01	14.09	82.75	0.00382	59
	3	1.59 ± 0.09	404.4 ± 6.32	46.3 ± 2.16	0.88 ± 0.01	12.64	81.99	0.00511	64
	6	1.72 ± 0.11	413.8 ± 9.25	44.5 ± 2.72	0.89 ± 0.01	13.78	81.17	0.00570	66
	24	1.19 ± 0.09	338.3 ± 5.98	49.2 ± 2.67	0.89 ± 0.01	14.78	82.25	0.005	78
500	1	1.74 ± 0.2	592.6 ± 12.04	92.86 ± 4.44	0.78 ± 0.01	7.91	92.11	0.00468	77
	3	2.3 ± 0.18	685.1 ± 9.19	65.96 ± 2.54	0.81 ± 0.01	8.38	89.37	0.0057	76
	6	2.25 ± 0.19	867.2 ± 12.77	53.55 ± 2.27	0.84 ± 0.01	9.55	91.02	0.0082	76
	24	1.93 ± 0.05	478.2 ± 4.26	53.74 ± 1.26	0.88 ± 0.01	15.37	87.44	0.00735	77
750	1	3.08 ± 0.22	628 ± 12.72	111.19 ± 7.70	0.78 ± 0.01	11.70	92.55	0.00734	66
	3	2.68 ± 0.19	751.3 ± 13.75	85.97 ± 3.60	0.8 ± 0.01	10.58	90.30	0.0079	70
	6	2.4 ± 0.20	877.5 ± 14.68	73.5 ± 3.21	0.82 ± 0.01	11.02	91.12	0.00966	72
	24	4.03 ± 0.24	670.8 ± 9.6	73.19 ± 3.18	0.84 ± 0.01	15.54	91.05	0.01042	70
1000	1	4.52 ± 0.26	748.2 ± 16.36	89.78 ± 4.55	0.8 ± 0.01	12.72	93.75	0.0095	63
	3	4.66 ± 0.24	846.9 ± 0.24	77.37 ± 3.3	0.81 ± 0.01	12.03	91.40	0.01019	66
	6	4.18 ± 0.24	909.1 ± 13.35	64.95 ± 3.30	0.83 ± 0.01	12.07	91.43	0.01097	70
	24	2.99 ± 0.09	977.5 ± 9.70	82.82 ± 1.94	0.79 ± 0.01	9.10	93.86	0.00889	86