Anodic Stripping Voltammetry of Se⁴⁺ on Gold-Modified Boron-Doped Diamond Electrodes

Figure 3

Stripping voltammograms of Se⁴⁺ in 0.1 M HClO₄ in the concentration range of 0–100 μg/L recorded on a BDD electrode, which was previously modified by gold nanoparticles deposited by chronocoulometry (−70 mC cm⁻² was applied for 1 minute in a solution of HAuCl₄ 100 ppm in 0.1 M HCl). The deposition potential (−0.4 V versus Ag/AgCl) was applied during 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. 𝑇=23°C.