Anodic Stripping Voltammetry of Se4+ on Gold-Modified Boron-Doped Diamond Electrodes
Figure 5
(a) Stripping voltammograms of Se4+ (concentration range 0–100 μg/L) in CuCl2, PbCl2, H3BO3, CdCl2, and K2Cr2O7, all 100 μg/L in 0.1 M HClO4 recorded on a BDD electrode, which was previously modified by gold nanoparticles deposited by chronocoulometry (−35 mC cm−2 was applied for 1 minute in a solution of HAuCl4 100 ppm in 0.1 M HCl). The deposition potential (−0.4V versus Ag/AgCl) was applied for 2 minutes before the stripping, which was performed at a scan rate of 200 mV/s. The upper potential limit was fixed at 1.2 V versus Ag/AgCl. (b) Calibration curve extracted from these stripping voltammograms. °C.
