Environmental friendly electrochemical determination of aspirin from alkaline aqueous solution

The electrochemical determination of acetylsalicylic acid (ASA) on multi-walled carbon nanotube- epoxy composite electrode (MWCNTs-EP) in aqueous solution was investigated using electrochemical techniques, e.g. cyclic voltammetry (CV), differentialpulsed voltammetry (DPV) and square-wave voltammetry (SWV). SWV applying allowed to reach the best performance in relation with the sensitivity for ASA determination in alkaline medium

Removal of turbidity and organic load from surface water by coagulation-flotation

The aim of this study is to monitor comparatively and operationally two drinking water treatment flows, a new based on flotation unit using prehydrolyzed aluminium coagulation agent in comparison with settling based on the conventional technological flow using aluminium sulphate coagulation agent. The new proposed and introduced flow exhibited greater drinking water treatment performance under the conditions of raw surface water characterized by low and medium loading in terms of turbidity and organic load. The new proposed technological flow allowed that all studied parameters characteristics to the drinking water for treated water to meet the requirements imposed by the legislative norms

Electrochemical detection of pentachlorophenol from water at carbon nanofibers-epoxy composite electrodes

In this paper cyclic voltammetry (CV) and linear-sweep voltammetry (LSV) experiments were conducted in order to compare the electroactivity of three types of carbon nanofibers based composite electrodes, i.e., natural and synthetic zeolite modified electrodes and a simple carbon nanofibers electrode for pentachlorophenol (PCP) detection. The enhancement factor of electrode sensitivity for the determination of PCP at the tested electrodes was determined by applying a chemical preconcentration step prior to voltammetric quantification. Synthetic-zeolite modified electrode exhibited a larger electroactivity than the other two electrodes, due to a better ability of synthetic zeolite particles from the electrode surface to retain PCP molecules, without inactivation of electroactive sites

Electrochemical behavior and determination of arsenic (III) from water using ag-doped-zeolitecarbon nanotubes composite electrode

The electrochemical behavior of Arsenic (III) from water was investigated using Agdoped-synthetic zeolite-carbon nanotubes composite electrode envisaging its determination in the aqueous solution. The electrocatalytic oxidation of arsenic in acidic medium at Ag-doped -synthetic zeolite-carbon nanotubes composite electrode (Ag-ZCNT) was investigated by cyclic voltammetry, with different practical working pretreatment applications

Electrochemical degradation of drug residues from water

The aim of this work was to investigate the performance of the boron doped diamond (BDD) for the degradation and mineralization of acetylsalicylic acid (ASA), chosen as a model of the pharmaceuticals pollutants from wastewater effluents proceeded from the pharmaceutical industry

Electrochemical Oxidation and Determination of Oxalic Acid at an Exfoliated Graphite-Polystyrene Composite Electrode

Abstract: An exfoliated graphite-polystyrene composite electrode was evaluated as an alternative electrode in the oxidation and the determination of oxalic acid in 0.1 M Na2SO4 supporting electrolyte. Using CV, LSV, CA procedures, linear dependences I vs. C were obtained in the concentrations range of oxalic acid between 0.5 to 3 mM, with LOD =0.05 mM, and recovery degree of 98%, without need of surface renewing between successive runs. The accuracy of the methods was evaluated as excellent comparing the detection results with that obtained using conventional KMnO4 titration method. In addition, the apparent diffusion coefficient of oxalic acid D was found to be around 2.89 · 10-8 cm 2 ·s-1 by CA and CV

Voltammetric detection of urea on an Ag-modified zeolite-expanded graphite-epoxy composite

sensor

Electrochemical Oxidation and Determination of Oxalic Acid at an Exfoliated Graphite-Polystyrene Composite Electrode

An exfoliated graphite-polystyrene composite electrode was evaluated as analternative electrode in the oxidation and the determination of oxalic acid in 0.1 M Na2SO4supporting electrolyte. Using CV, LSV, CA procedures, linear dependences I vs. C wereobtained in the concentrations range of oxalic acid between 0.5 to 3 mM, with LOD =0.05mM, and recovery degree of 98%, without need of surface renewing between successiveruns. The accuracy of the methods was evaluated as excellent comparing the detection resultswith that obtained using conventional KMnO4 titration method. In addition, the apparentdiffusion coefficient of oxalic acid D was found to be around 2.89 · 10-8 cm2·s-1 by CA andCV.Applied Science