Electroanalysis of Peracetic Acid in the Presence of a Large Excess of Hydrogen Peroxide

Simultaneous Detection of Peracetic Acid and Hydrogen Peroxide by Amperometry at Pt and Au Electrodes

“…In this last case (Fig. 1b), two well separated reduction peaks were recorded (the first at about 0.30 V for PAA and the second at about À 0.22 V for H 2 O 2 ), in agreement with the literature [19,31], whose height increased linearly with the concentration of the relevant analyte. However, potential values for these two cathodic processes occurring at Au electrodes were scarcely reproducible, in agreement with previous reports [19,31] where this drawback was attributed to the progressive surface change of gold electrodes, as a result of its breakdown due to the H 2 O 2 reduction.…”

“…1b), two well separated reduction peaks were recorded (the first at about 0.30 V for PAA and the second at about À 0.22 V for H 2 O 2 ), in agreement with the literature [19,31], whose height increased linearly with the concentration of the relevant analyte. However, potential values for these two cathodic processes occurring at Au electrodes were scarcely reproducible, in agreement with previous reports [19,31] where this drawback was attributed to the progressive surface change of gold electrodes, as a result of its breakdown due to the H 2 O 2 reduction. This notwithstanding, the reproducibility of this cathodic profile too could be optimized resorting once again to the electrochemical cleaning procedure based on a multiscan sequence between negative and positive potentials already mentioned above.…”

Fractional determination of peracetic acid and hydrogen peroxide at deposited gold enriched in the Au(1 1 1) domain

“…In the present case, the different facets of poly-Au electrode have different PZC values; Au(1 1 1) 0.285 V, Au(1 0 0) 0.140 V and Au(1 1 0) −0.015 V vs. saturated calomel electrode [32]. Knowing these and taking into consideration that the pK a of PAA equals 8.2 [13], it could be proposed that the adsorption of PAA at Au(1 1 1) will be the strongest as the potential will first cross the PZC value of the Au(1 1 1) facet compared with other two facets, facilitating the electroreduction. In addition, the adsorption of an intermediate might show a favorable matching of the surface atomic arrangement in Au(1 1 1) with the adsorption of PAA [33].…”

“…It is noteworthy to mention that PAA solutions, commonly known as equilibrium peracetic acid, contain appreciable amounts of H 2 O 2 , in addition to oxygen gas as a result of the continuous decomposition of PAA especially in neutral and alkaline solutions [13]. Thus the main interfering species are H 2 O 2 and oxygen gas.…”

“…These methods suffer somehow from the selectivity problem in addition to the difficult experimental set up as well as time-consuming measurements. Our group in a series of papers [11][12][13] proposed the simultaneous analysis of both species at polycrystalline gold electrode (poly-Au) using hydrodynamic and square wave voltammetric techniques.…”