Flow injection amperometric determination of pyridoxine at a Prussian blue nanoparticle-modified carbon ceramic electrode

✍ Scribed by H. Razmi; R. Mohammad-Rezaei

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 689 KB
• Volume: 55
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/j.electacta.2009.10.072

✦ Synopsis

This work describes the electrocatalytic properties of a carbon composite electrode (CCE) modified with Prussian blue (PB) nanoparticles (NPs) for the electrocatalytic oxidation of pyridoxine (PN). The morphology of the PBNP-modified CCE was characterized by scanning electron microscopy (SEM). The mechanism and kinetics of the catalytic oxidation reaction of PN were monitored by cyclic voltammetry and chronoamperometry. The rate-limiting step of the charge transfer reaction was found to be a one-electron abstraction. The value of ˛, k, and D were calculated as 0.66, 6.7 × 10 4 M -1 s -1 , and 1.88 × 10 -5 cm 2 s -1 , respectively. The modified electrode showed electrocatalytic activity toward the oxidation of PN and was used as an amperometric sensor. The sensor exhibited good linear response for PN over the concentration ranges 5-69 and 1-80 M with detection limits of 0.51 and 0.87 M, and sensitivities of 0.97 and 0.673 A M -1 cm -2 in batch and flow conditions, respectively. Some important advantages such as simple preparation, fast response, good stability, and reproducibility of the sensor for the amperometric determination of PN were achieved.