A Novel Carbon Paste Electrode Modified with N¹-Hydroxy-N¹,N²-Diphenylbenzamidine for the Electrochemical Determination of Cadmium(II) in Environmental Samples

Figure 9

(a): SWASVs of 100 nM Cd(II) in Britton Robinson (B-R) buffer (0.1 M, pH 4) at (A) unmodified CPE and (B) HDPBA‒CPE. Accumulation time: 270 s; potential −1.0 V; amplitude: 100 mV; frequency: 80 Hz; step potential: 6 mV. (b): Square wave voltammograms of 100 nM Cd(II) at HDPBA modified CPE in 0.1 M B-R solution (pH 4) (A) nondeaerated solution (0 min), (B) deaerated solution for 5 min, (C) dearated solution for 8 min, and (D) dearated solution for 10 min.

(a)

(b)