Table 1 PDP Parameters for MS in 1M HCl in the absence and presence of different concentrations of LPr and LPr + 10 ppm NaBenz at 30 °C.

C (ppm)	E _corr (V vs. Ag/AgCl)	β_a/(V dec⁻¹)	β_c/(V dec⁻¹)	i_corr × 10⁻³(A cm⁻²)	η_PDP (%)
1M HCl	−0.43	0.162	0.130	1.20	—
LPr
100	−0.440	0.111	0.084	0.436	63.7
200	−0.433	0.122	0.074	0.325	72.9
300	−0.431	0.118	0.076	0.277	76.9
400	−0.445	0.118	0.079	0.233	80.6
500	−0.412	0.288	0.102	0.192	83.9
600	−0.435	0.131	0.089	0.218	81.8
LPr + 10 ppm NaBenz
10 ppm NaBenz	−0.433	0.143	0.109	1.141	5.0
100	−0.436	0.106	0.070	0.130	73.0
200	−0.405	0.107	0.069	0.107	77.8
300	−0.408	0.109	0.069	0.07	85.7
400	−0.405	0.242	0.077	0.06	87.6
500	−0.403	0.196	0.089	0.045	90.7
600	−0.414	0.119	0.067	0.092	81.1

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