Behaviour of Ti electrode in the amperometric determination of high concentrations of strong oxidising species

Abstract

The study of the capabilities of an unusual electrode material, namely, Ti, is presented: the amperometric determination of species showing responses that, on different materials, cannot be often profitably exploited, is proposed. H 2 O 2 and HClO are successfully analysed, even at high concentrations. In similar conditions, which are quite common in industrial environments, these strong oxidising species are determined by time-consuming, off-or at-line, and multistep procedures. A complex real matrix, such as an industrial detergent, containing high H 2 O 2 concentrations, has been taken as a meaningful study case to check the effectiveness of the electrode system and procedure proposed.

Electroanalytical applications of a graphite–Au nanoparticles composite included in a sonogel matrix

“…This conclusion comes out from the value of the charge spent in correspondence of the reduction peak at ca. +0.80 V, which is proportional to the area of the Au exposed to the solution [24]. Moreover, when performing similar analyses on a single electrode, progressively removing the outermost layer by mechanical cleaning, the total overlap between the different voltammograms indicates the high reproducibility of the composition of the material at different depth.…”

“…The analytical interest of the quantitative evaluation of this species is related to its importance in many different contexts, from clinical exams to industrial productions [24]. Moreover, the determination of many chemical species by means of enzymatic biosensors takes advantage of the determination of H 2 O 2 produced in the close proximity of the electrode surface.…”

Voltammetric behaviour of Cu alloys toward hydrogen peroxide and organic species

“…In the case of H 2 O 2 , voltammetric curves were recorded from OCP to −1.00 V [21]. We could ascertain that a suitable pre-treatment of the electrode leads to more repeatable and reproducible results [23,24]. We verified that the most suitable pre-treatment consists of 25 potential sweeps from OCP to −1.00 V, 50 mVs −1 potential scan rate, in 1 M citrate buffered solution, pH 4, in presence of the maximum tested H 2 O 2 concentration, namely 200 mM [21].…”

Nanostructured Au/Ti bimetallic electrodes in selective anodic oxidation of carbohydrates

“…Ti constitutes a novel electrode material in the fields of electrocatalysis and electroanalysis [1,2]. In our previous papers we reported the electrochemical behaviour of bare Ti electrodes with respect to strong oxidizing species [1] and to heavy metals [2]: effective amperometric sensing systems for hydrogen peroxide, hypochlorite ions, and Au(III) species have been developed.…”

“…In our previous papers we reported the electrochemical behaviour of bare Ti electrodes with respect to strong oxidizing species [1] and to heavy metals [2]: effective amperometric sensing systems for hydrogen peroxide, hypochlorite ions, and Au(III) species have been developed. It is important to underline that a layer of Ti x O y , few nanometer thick, spontaneously forms on Ti surface [3].…”