Amperometric monitoring of hydrogen peroxide in workplace atmospheres by electrodes supported on ion-exchange membranes

Toniolo, Rosanna; Geatti, Paola; Bontempelli, Gino; Schiavon, Gilberto

doi:10.1016/s0022-0728(01)00612-x

Cited by 48 publications

(27 citation statements)

References 15 publications

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“…Hydrogen peroxide underwent instead both anodic and cathodic processes, in agreement with previous reports [27,43]. In particular, at all pHs the anodic process detected at Pt and Au electrodes occurred at potentials quite close to those required for the formation onto electrode surfaces of the well known thin "metal oxide" layer that mediates H 2 O 2 oxidation [44].…”

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confidence: 90%

Simultaneous Detection of Ascorbic Acid and Hydrogen Peroxide by Flow‐Injection Analysis with a Thin Layer Dual‐Electrode Detector

et al. 2010

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Based on preliminary voltammetric investigations at unmodified and modified electrodes in aqueous solutions buffered at different pHs, a profitable thin layer dual-electrode detector was developed for the selective and simultaneous determination of ascorbic acid (AA) and hydrogen peroxide present in the same samples. It consists of a small thickness (0.1 mm) cell, used as a detector for a flow injection system, in which a glassy carbon (GC) and a polyeugenol coated Pt electrode are encased. The GC electrode is selective for AA, thanks to the potential applied (0.3 V vs. Ag/AgCl,Cl À sat ), while H 2 O 2 alone can be oxidized at the Pt electrode (0.75 V), thanks to the size selectivity and electrostatic screen properties displayed by the polyeugenol coating layer which prevents oxidation of ascorbate anions. Repeatable sharp peaks (AE 4.5 %) were detected for both analytes over wide linear ranges (0.005-1.000 mM) and detection limits of about 10 À6 M (176 ppb) and 5 10 À7 M (16 ppb) were inferred for AA and H 2 O 2 respectively. This flow injection approach was applied to the analysis of some orange-taste soft drinks, used as prototype real samples, spiked with controlled amounts of both analytes, thus inferring good recoveries which pointed out that deviations never exceeding 5 % affected the relevant accuracy.

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confidence: 90%

Simultaneous Detection of Ascorbic Acid and Hydrogen Peroxide by Flow‐Injection Analysis with a Thin Layer Dual‐Electrode Detector

et al. 2010

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“…It deserves to be emphasized that a better reproducibility for this process was found at Pt electrodes, probably because this electrode surface assures an overvoltage for the involved anodic reaction that is as small as possible, thanks to the profitable formation of a thin "Pt oxide" layer which is particularly suitable to mediate H 2 O 2 oxidation [27]. Conversely, both peak shape and peak potential observed at Au electrodes for this anodic process were scarcely reproducible, conceivably because gold surface undergoes progressive fouling in the presence of H 2 O 2 (thus losing its activity), as reported elsewhere [18,28].…”

Section: Apparatus and Proceduresmentioning

confidence: 99%

“…At first, an equilibration potential E 0 , at which neither oxidation nor reduction processes can occur, was applied for 100 ms. Then, the electrode potential was instantaneously stepped to the first detection potential E 1 , appropriate for the H 2 O 2 oxidation mediated by a freshly produced "Ptoxide" layer [27], and the faradic signal was sampled during a short time (t s1 ¼ 50 ms) at the end of the detection period (t 1 ¼ 100 ms). The delay before sampling (50 ms) served to reduce capacitance currents to virtually nil.…”

Section: Triple-pulse Simultaneous Amperometric Detection Of H 2 O 2 mentioning

confidence: 99%

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

et al. 2006

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Based on preliminary voltammetric investigations at both Pt and Au electrodes in aqueous solutions buffered at different pH values in the range 0 -10, two possible profitable triple-pulse amperometric approaches were developed for determining simultaneously peroxyacetic acid (PAA) and hydrogen peroxide present in the same samples. At both surfaces a pulsed waveform applied at rotating-disc electrodes was adopted to take advantage on one hand of the optimized signal reproducibility achieved by this potential multistep antifouling approach and on the other hand of the constant thickness of the diffusion layer, which is necessary when the recording of time-independent currents is desired. At a rotating-disc Pt electrode an anodic selective signal was indeed recorded for H 2 O 2 alone, while PAA contents could be inferred only from the difference of convenient signals, since at all pHs explored its sole cathodic reaction could be observed at potentials coincident with those proper for the reduction of H 2 O 2 too. The same pulse approach at Au electrodes instead provided totally independent signals for the two analytes considered, thus proving to be suitable for their independent detection. In fact, H 2 O 2 alone undergoes anodic oxidation also at this surface, while the reduction of PAA occurs at potentials less cathodic than those required for H 2 O 2 . At both electrodes, the best results turned out to be achieved at pH 0 in terms of both precision (AE 2 -4%) and detection limits (0.2 -0.3 mM), as well as of linear range which extended for about three orders of magnitude. The kinetics of the equilibrium involving the generation of H 2 O 2 from the reaction of PAA with water was also evaluated, since it was suspected of making unreliable the proposed amperometric approaches.

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“…To avoid these drawbacks, amperometric gas sensors based on the use of moist ion-exchange membranes as solid polymer electrolytes (SPEs) were developed in the last two decades. [4][5][6][7][8][9][10][11][12][13] In these devices the membrane separating the gaseous samples from the internal electrolyte is not permeated by analytes but serves to provide the transfer of charged species from the working to the counter electrode, thus playing the role assumed by usual supporting electrolytes. Remarkable benefits are gained from the use of this assembly thanks to the elimination of a permeation step.…”

Section: Introductionmentioning

confidence: 99%

An electrochemical gas sensor based on paper supported room temperature ionic liquids

et al. 2012

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A sensitive and fast-responding membrane-free amperometric gas sensor is described, consisting of a small filter paper foil soaked with a room temperature ionic liquid (RTIL), upon which three electrodes are screen printed with carbon ink, using a suitable mask. It takes advantage of the high electrical conductivity and negligible vapour pressure of RTILs as well as their easy immobilization into a porous and inexpensive supporting material such as paper. Moreover, thanks to a careful control of the preparation procedure, a very close contact between the RTIL and electrode material can be achieved so as to allow gaseous analytes to undergo charge transfer just as soon as they reach the threephase sites where the electrode material, paper supported RTIL and gas phase meet. Thus, the adverse effect on recorded currents of slow steps such as analyte diffusion and dissolution in a solvent is avoided. To evaluate the performance of this device, it was used as a wall-jet amperometric detector for flow injection analysis of 1-butanethiol vapours, adopted as the model gaseous analyte, present in headspace samples in equilibrium with aqueous solutions at controlled concentrations. With this purpose, the RTIL soaked paper electrochemical detector (RTIL-PED) was assembled by using 1butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide as the wicking RTIL and printing the working electrode with carbon ink doped with cobalt(II) phthalocyanine, to profit from its ability to electrocatalyze thiol oxidation. The results obtained were quite satisfactory (detection limit: 0.5 mM; dynamic range: 2-200 mM, both referring to solution concentrations; correlation coefficient: 0.998; repeatability: AE7% RSD; long-term stability: 9%), thus suggesting the possible use of this device for manifold applications.

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Amperometric monitoring of hydrogen peroxide in workplace atmospheres by electrodes supported on ion-exchange membranes

Cited by 48 publications

References 15 publications

Simultaneous Detection of Ascorbic Acid and Hydrogen Peroxide by Flow‐Injection Analysis with a Thin Layer Dual‐Electrode Detector

Simultaneous Detection of Ascorbic Acid and Hydrogen Peroxide by Flow‐Injection Analysis with a Thin Layer Dual‐Electrode Detector

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

An electrochemical gas sensor based on paper supported room temperature ionic liquids

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