A Study of the Determination of Cu(II) by Anodic Stripping Voltammetry on a Novel Nylon/Carbon Fiber Electrode

Abstract

In this work we report a new electrode material formed by injection-moulding of a conducting polymer consisting of carbon fibers in a Nylon matrix. This material is highly conductive, inexpensive, easy to mould in different shapes and requires minimal pretreatment. The electrode was tested as a mercury-free sensor for the trace determination of Cu(II) by anodic stripping voltammetry (ASV). The deposition and stripping behavior of copper on the conducting material was initially studied by cyclic voltammetry and the chemical and instrumental parameters of the determination were investigated. The electrode has been shown to be suitable for the determination of Cu(II) in the range 8 mg L À1 to 30 mg L À1 (with deposition times ranging from 30 s to 10 min) with a relative standard deviation of 2.2% (at the 0.5 mg L À1 level) and a limit of detection of 8 mg L À1 Cu(II) for 10 min of accumulation (at a S/N ratio of 5). The electrode was, finally, applied to the determination of copper in tap-water, pharmaceutical tablets and bovine serum with recoveries of 97.4, 94.9 and 93.4%, respectively

Recent Developments in Stripping Analysis on Microelectrodes

“…Carbon screen-printed electrodes modified with gold nanoparticles have been proposed to determine Sb, and have proved effective in determining trace levels of Sb in seawater samples and pharmaceutical preparations [131]. A novel conducting plastic material consisting of carbon fibres in a Nylon matrix has been proposed for trace Cu determinations [132]. The electrode is made by injection-moulding of the conducting polymer, and the system can determine Cu in tap water, bovine serum and pharmaceutical preparations.…”

Employment of Ruthenium as Permanent Modifier for the Determination of Copper in Serum Samples by Electrothermal Atomic Absorption Spectrometry

“…The electrode was tested as a mercury-free sensor for the trace determination of Cu(II) by anodic stripping voltammetry (ASV) and has been shown to be suitable for the determination of Cu(II) in the range 8 mg L 21 to 30 mg L 21 (with deposition times ranging from 30 s to 10 min) with a relative standard deviation of 2.2% (at the 0.5 mg L 21 level) and a limit of detection of 8 mg L 21 Cu(II) for 10 min of accumulation (at a S/N ratio of 5). The electrode was, finally, applied to the determination of copper in tap water, pharmaceutical tablets, and bovine serum with recoveries of 97.4%, 94.9%, and 93.4%, respectively (Mylonakis et al 2004). presented a stripping voltammetric method for the determination of trace amounts of copper(II) with a recently synthesized naphthol-derivative Schiff's base f2,2 0 -[1,2-ethanediylbis(nitriloethylidyne)]bis(l-naphthaleneg.…”

Determination of Copper at a Glassy Carbon Electrode Modified with Langmuir–Blodgett Film of p‐tert‐Butylthiacalix[4]arene

“…Further negative shift of the accumulation potential, the stripping peak currents changed very slightly, however, the background current increased simultaneously. This was explained by the fact that at potentials more negative than À 0.5 V, the copper peak current was controlled by the mass transfer of Cu 2þ ions to the electrode surface and not by the electrode potential [28]. Thus À 0.5 V was chosen as the accumulation potential in following studies.…”