In this study, the enhancement of electrochemical signals of Cr(iii) and Cr(vi) by using an activated glassy carbon electrode (GCE) measured by differential pulse voltammetry (DPV) is demonstrated. The activated GCE exhibited higher sensitivity for detection of Cr(iii) and Cr(vi) compared with the bare GCE. By using the activated GCE, the limit of detection decreased 15.3 times (from 0.230 to 0...

Nanostructured poly(anthranilic acid) was synthesized by oxidative polymerization using potassium persulfate as an oxidant and malonic acid (MA) as dopant. The synthesized polymer was characterized by various techniques. The structure of poly(anthranilic acid) was confirmed by FT-IR spectroscopy. The UV-Vis spectra of poly(anthranilic acid) shows π-π* and inter-ring charge transfer bands. The s...

A poly(methylene blue)-modified glassy carbon electrode (PMB/GCE) was fabricated by electropolymerisation of methylene blue on a GCE and further utilized to investigate the electrochemical determination of 4-nitrophenol (4-NP) by cyclic voltammetry (CV), differential pulse voltammetry and chronocoulometry. The morphology of the PMB on GCE was examined using a scanning electron microscope (SEM)....

A nonenzymatic electrochemical sensor is drop casted for sensitive and specific fenitrothion (FT) detection, where a glassy carbon electrode (GCE) modified by depositing an ink containing nitrogen–sulfur co-doped activated carbon-coated multiwalled nanotubes (NS-AC-MWCNTs). We provide method NS-AC-MWCNT synthesis as follows. First, polypyrrole coated on (PPy-MWCNT). Then, the PPy coating carbon...

As a well-known toxic pollutant, sulfide is harmful to human health. In this study, a simple and sensitive amperometric inhibitive biosensor was developed for the determination of sulfide in the environment. By immobilizing nanoporous gold (NPG) on glassy carbon electrode (GCE), and encapsulating horseradish peroxidase (HRP) onto NPG, a HRP/NPG/GCE bioelectrode for sulfide detection was success...

Many quinolones, substituted quinolines and thiones are well known for their biological activity. The redox characteristics of such biological substances may provide valuable information about the redox behaviour in living systems. The present paper is aimed at carrying out a methodical cyclic voltammetric investigation of the peak potential values of 4-methyl/phenyl -3vinyl quinoline-2(1H) one...

Voltammetric studies have been carried out using a glassy carbon electrode (GCE) modified with multi-walled carbon nanotubes (MWCNTs) and the ionic liquid 1-butyl-3-methylimidazolium chloride (IL). Studies on the electrochemical properties of GCEs modified with MWCNTs and IL within different polymeric films (dihexadecylphosphate (DHP), Nafion, and chitosan (CTS)) were performed using a [Fe(CN)6...

We studied the electrochemical properties of gold nanoparticles (GNPs) and their complexes with proteins using square-wave voltammetry. Effect of the nanoparticle size and detection procedure was explored upon the oxidation of GNPs on a glassy carbon electrode (GCE). For pre-characterized GNPs of 13, 35 and 78 nm diameter, the oxidation peak potential was +0.98, +1.03 and +1.06 V vs. Ag/AgCl, r...

A graphene nanosheets (GNS) film coated glassy carbon electrode (GCE) was fabricated for sensitive determination of tyrosine (Tyr). The GNS-based sensor was characterized by scanning electron microscope and electrochemical impedance spectroscopy. The voltammetric techniques were employed to study electro-oxidation of Tyr. The results revealed that the modified electrode showed an electrocatalyt...

The determination of brominated flame retardants is of great importance, but remains a challenge. Particularly, universal and facile approaches are limited. Here we report a new general approach, combining molecular imprinting and electrospinning, for the efficient and facile imprinting sensor of 2,4,6-tribromophenol (TBP), which was used as a “novel” brominated flame retardant. With TBP as the...