Electronic Supplementary Material

A glassy carbon electrode modified with antimony and poly(p-aminobenzene sulfonic acid) for sensing lead(II) by square wave anodic stripping voltammetry

Wen Jiao Yi, Yang Li, Gu Ran, Hong Qun Luo, Nian Bing Li[(]

Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China

Fig. S1. Voltammograms of the polymerization of p-ABSA. Polymerization conditions: 2.0 mM p-ABSA in 0.1 M phosphate buffer solution (pH 7.6); cycle number: 10.0; scan rate: 200 mV s-1.

Fig. S2 Effect of the initial potential of the poly(p-ABSA) on stripping peak current of 50.0 μg L–1 Pb(II) at the Sb/poly(p-ABSA)FE.

Fig. S3 Effect of the high potential of the poly(p-ABSA) on stripping peak current of 50.0 μg L–1 Pb(II) at the Sb/poly(p-ABSA)FE.

Fig. S4 Effect of the scan rate of the poly(p-ABSA) on stripping peak current of 50.0 μg L–1 Pb(II) at the Sb/poly(p-ABSA)FE.

Fig. S5 Stripping voltammograms on an in situ plated Sb/poly(p-ABSA)FE: using the differential pulse anodic stripping voltammetry (DPASV), linear sweep anodic stripping voltammetry (LSASV), and square wave anodic stripping voltammetry (SWASV).

Fig. S6 Effect of the deposition potential of the measure solution on the peak current
of 50.0 μg L-1 Pb(II).

Fig. S7 Effect of the deposition time of the measure solution on the peak current
of 50.0 μg L-1 Pb(II).

Fig. S8 Effect of the frequency (from a to e: 10.0, 20.0, 25.0, 35.0, and 50.0 Hz, respectively) of the measure solution on the peak current of 50.0 μg L-1 Pb(II) at the Sb/poly(p-ABSA)FE.

Fig. S9 Effect of the step increment increased (from a to e: 1.0, 2.0, 4.0, 6.0, and 8.0 mV, respectively) of the measure solution on the peak current of 50.0 μg L-1 Pb(II) at the Sb/poly(p-ABSA)FE.


Table S1 Ratio of interference to 20.0 μg L-1 Pb(II).

Potentially interfering ions / Tolerated ratio / Potentially interfering ions / Tolerated ratio
SO42- / 1000 / Cd2+ / 50
Cl- / 750 / Mg2+ / 50
NO3- / 750 / Zn2+ / 40
K+ / 500 / Co2+ / 15
NH4+ / 500 / Cr3+ / 15
Na+ / 200 / Fe3+ / 5
Ba2+ / 175 / Ni2+ / 3
Ca2+ / 75 / Cu2+ / 0.5

S1

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