Electrocatalytic Oxidation and Determination of Sulfite with a Novel Copper‐Cobalt Hexacyanoferrate Modified Carbon Paste Electrode

Abstract

The electrocatalytic oxidation of sulfite has been studied at a stable electroactive thin film of copper-cobalt hexacyanoferrate (CuCoHCF) hybrid electrodeposited on a carbon paste electrode (ECMCPE). A linear range of 5 mM to 5 mM of sulfite, with an experimental detection limit of 1 mM, was obtained using the cyclic voltammetric method. The oxidation of sulfite showed no significant fouling effect on the modified electrode surface at sulfite concentrations below 5 mM. The proposed modified electrode exhibited several attractive features, including simple preparation, fast response, good stability and repeatability, and could be applied to sulfite determination in real samples.

Cerium hexacyanoferrate/ordered mesoporous carbon electrode and its application in electrochemical determination of hydrous hydrazine

“…And the CVs of CeHCF/OMC/GCE in 1.5 mol/L NaCl at different pH values (4.0-9.0) were recorded. The peak current gradually enhanced with the pH increased and reached the maximum at pH 7.0, and then gradually decreased, which was most possibly attributed to the formation of Fe(OH) 3 in solution [32]. Owing to a well-defined peak and good voltammetric response can be obtained at pH 7.0, the solution pH of 7.0 was selected in the following experiments.…”

Electrochemical fabrication of metallic nanostructured electrodes for electroanalytical applications

“…46,47 Also a variety of Prussian blue analogues have been formed and tested in analytical environments, including nickel, 48,49 copper 50 and ruthenium oxide 51,52 HCFs, and also mixed HCFs of Cu/Pd 53 and Cu/Co. 54 It is expected that this area will continue to be explored as other novel HCFs are synthesised and tested.…”

Carbon nanotubes for voltammetric determination of sulphite in some beverages

“…The main interfering species present in beverage and food samples are glucose, sucrose, fructose, and ascorbate, and polyphenolic compounds present in red wine and red fruit juice samples (Isaac et al, 2006). The main approaches used to overcome these limitations are the separation of SO 2 from the sample using gas-diffusing membranes (silicone or polytetrafluoroethylene) before detection (Chinvongamorn, Pinwattana, Praphairaksit, Imato, & Chailapakul, 2008;Corbo & Bertotti, 2002;Lowinsohn, Alipázaga, Coichev, & Bertotti, 2004;Martins et al, 2011); the use of electrochemical biosensors (Dinçkaya, Sezginturk, Akyilmaz, & Eertas, 2007;Rawal, Chawla, & Pundir, 2012;Sartori, Vicentini, & Fatibello-Filho, 2011;Sezginturk & Dinçkaya, 2005;Zhao, Hibbert, & Gooding, 2006); and the use of electrodes chemically modified with metal nanoparticles (Molinero-Abad, AlonsoLomillo, Domínguez-Renedo, & Arcos-Martínez, 2013;, carbon nanotubes (Ensafi & Karimi-Maleh, 2010;Sartori & Fatibello-Filho, 2012;Sartori, Takeda, & Fatibello-Filho, 2011;Sartori, Vicentini, et al, 2011;Zhou et al 2008), porphyrins (Agboola & Nyokong, 2007;Lucero et al, 2012), metal hexacyanoferrates (García, Casero, Lorenzo, & Pariente, 2005;Majidi, Asadpour-Zeynali, Shahmoradi, & Shivaeefar, 2010;Siroueinejad et al, 2009), and other metal complexes (Salimi, Pourbeyram, & Amini, 2002).…”

“…The main attractive features of these techniques include simplicity, cheap instruments, high sensitivity, and compatibility with suspensions or coloured samples, which minimizes sample pretreatment requirements. Most of the electrochemical methods proposed for sulphite determination are based on its electrochemical oxidation (Corbo & Bertotti, 2002;Dadamos & Teixeira, 2009;Dilgin, Kızılkaya, Ertek, Eren, & Dilgin, 2012;Isaac et al, 2006;Martins et al, 2011;Shankaran, Iimura, & Kato, 2004;Siroueinejad, Abbaspour, & Shamsipur, 2009;Toniolo, Pizzariello, Susmel, Dossi, & Bontempelli, 2010;Zhou, Yang, & Sun, 2008). The limits of detection (LODs) achieved using these methods are in the range of 0.3-200 lmol L À1 .…”