Electrochemical Behaviour of Poly(benzopyrene) Films Doped with Eriochrome Black T as a Pb²⁺‐Sensitive Sensors

Abstract

Poly(benzopyrene) films were electrosynthesized on glassy carbon disk electrodes from benzo(a)pyrene by cyclic voltammetry in the presence of eriochrome black T, which forms strong complexes with lead ions. In consequence, by conditioning the films in high concentration of lead (0.1 mol dm À3 Pb(NO 3 ) 2 ) potentiometric sensitivity to lead ions down to 10 À5 mol dm À3 Pb 2 + was induced, and a novel type of lead-sensitive electrode was obtained. The electrode is characterized by high stability of the potential readouts, good reproducibility of the calibration curves as well as a minor hysteresis effects. The performance of our lead-sensitive electrode was favourable compared to PEDOT and PPy-based electrodes doped with eriochrome black T. We conclude that poly(benzopyrene) doped with eriochrome black T is a new electroactive material that may be applied in sensor technology.

A solid-contact Pb2+-selective polymeric membrane electrode with Nafion-doped poly(pyrrole) as ion-to-electron transducer

“…However, it is rather expensive, time-consuming, and not suitable for on-site analysis. Potentiometry with ISEs is a very promising method for trace Pb 2+ level analysis [19,20], owing to its advantages such as low cost, simple analytical procedure, and fast response.…”

Properties and Customization of Sensor Materials for Biomedical Applications

“…While PANi, PPy, and PEDOT have been extensively investigated as solid contacts in ISEs, the possibility of improving SC-ISE performance using other CPs or by CPs nanostructuring seems to be relatively unexplored (189). For instance, polypyrrole microcapsules have previously been employed as solid contacts in calcium-ISEs (190,191).…”

“…However, thus far, such sensors suffer from poor sensitivity and high LODs (144,189,192,193). PANi deposited on plastic substrates by means of ink-jet printing was used to detect pH changes both potentiometrically and spectrophotometrically (192), but the selectivity factor hampered their use in real-sample scenarios (192).…”

Influence of phosphate buffer and proteins on the potentiometric response of a polymeric membrane-based solid-contact Pb(II) ion-selective electrode

“…Depending on the size of the biomolecules and the porosity of the electrode material, the biomolecules may deposit on the electrode surface and also enter into the bulk of the electrode material [17]. Additionally, a target biomolecule (template) may be immobilized at the interface and in the bulk of the material via chemical (or electrochemical) polymerization forming a polymer network with binding sites for a specific biomolecule (molecular imprinting) [14,18,19].…”