Preparation and Potentiometric Measurement of Peroxycitric Acid

Arsenic detection by nanogold/conducting‐polymer‐modified glassy carbon electrodes

“…Sharp cathodic peaks of nearly equal magnitudes around 0.5 V were observed for both electrodes employed. Similar results were observed in our previous work,14 suggesting the deposition of Au onto the electrode surfaces by the reduction of Au(III) to metallic Au(0) as follows: To deposit nano‐Au particles onto the GC and PANI/GC electrodes, in both the absence and presence of I − , the procedure from the previously published reports13, 18 was adopted. The electrodes were immerged into an electrolytic solution containing Au(III), and a potential step from 1.1 to 0 V was applied for 45 s (the deposition for 45 s was not carried out at once but followed a progressive deposition of 15 s repeated three times; thus, a total of 15 s + 15 s + 15 s = 45 s of deposition was achieved).…”

“…Notably, a similar stripping anodic wave was also observed around 0.23 V even in the solution containing as little as 0.4 ppb As(III). At this low As(III) concentration solution, however, the I − ‐nano‐Au/GC electrode showed no such stripping peak,14 although it possessed comparable sensitivity in detecting As(III) at concentrations as high as 610 ppb. The origin of the superior detection capacity of the I − ‐nano‐Au/PANI/GC electrode in the low As(III) concentration was not studied further in this work, but the superior sensitivity may have arisen from the high dispersion of nano‐Au particles in the polymer segment, as evidenced by the SEM measurements.…”

“…The electrochemical response of As(III) was next examined by SWV because high sensitivity and a large linear range could be achieved with the SWV technique 13, 14. Also, according to the same report,14 the SWV parameters of a 75‐Hz frequency and 25‐mV amplitude were chosen for all the subsequent analysis in this study. The SWV responses of As(III) reduction at −0.3 V for 60 s of predeposition at nano‐Au/GC, I − ‐nano‐Au/GC, and I − ‐nano‐Au/PANI/GC electrodes were examined, and the results are shown in Figure 6.…”

“…Recently, the detection of As(III) with a Au‐nanoparticle‐modified glassy carbon (nano‐Au/GC) electrode was performed with a limit of detection (LOD) of 0.0096 13. In another study,14 As detection was performed with nano‐Au/GC electrodes prepared both in the absence and in the presence of an I − additive, and a superior detection level was attained with the latter electrode.…”

Studies on the oxygen atom transfer reactions of peroxomonosulfate: Oxidation of glycolic acid

“…The syntheses of peroxy carboxylic acid by the reaction with peroxide have been increasingly reported. Formation of peroxy carboxylic acid from α-hydroxy acids, such as citric acid, with hydrogen peroxide has been reported [27]. Therefore, the oxidation of nickel glycolate can proceed through either peroxy acid intermediate or hydroperoxide intermediate.…”