Electrochemical Detection of Iron in a Lixiviant Solution of Polluted Soil Using a Modified Glassy Carbon Electrode

Table 2

Electroanalytical data for ionic iron electroreduction using different substrates considered in this study, in 0.1 M KCl at 298 K: Glassy Carbon Electrode (GCE), Glassy Carbon Electrode-Multiwalled Carbon Nanotubes (GCE-MWCNT), Glassy Carbon Electrode-Multiwalled Carbon Nanotubes-Polyanaline (GCE-MWCNT-PANI), Glassy Carbon Electrode-Platinum nanoparticles (GCE-Pt), Glassy Carbon Electrode-Multiwalled Carbon Nanotubes-Platinum nanoparticles (GCE-MWCNT-Pt), and Glassy Carbon Electrode-Multiwalled Carbon Nanotubes-Polyanaline-Platinum nanoparticles (GCE-MWCNT-PANI-Pt), where 𝑚: slope: sensibility, 𝜎: standard deviation, D. L.: detection Limit and Q. L.: quantification Limit.

Electrode	Equation	𝑅^2	𝑚/𝐴 cm^−2 M^−1	σ/10^−8 A cm^−2	D. L./μM	Q. L./μM
GCE	𝑖=0.0298[Fe^3+]+0.00002	0.9763	0.0298	1.3866	1.396	4.653
GCE-MWCNT	𝑖=0.0425[Fe^3+]+0.000006	0.9971	0.0425	0.3358	0.237	0.790
GCE-MWCNT-PANI	𝑖=0.0214[Fe^3+]+0.00002	0.9724	0.0214	0.0533	0.075	0.249
GCE-Pt	𝑖=0.0073[Fe^3+]+0.00003	0.9426	0.0073	0.2046	0.841	2.803
GCE-MWCNT-Pt	𝑖=0.0071[Fe^3+]+0.000003	0.9959	0.0071	0.0887	0.017	0.056
GCE-MWCNT-PANI-Pt	𝑖=0.1488[Fe^3+]+0.00005	0.9727	0.1488	0.0172	0.003	0.012