Electrocatalytic Determination of Hydroxylamine in the Presence of Thiosulfate in Water and Wastewater Samples Using a Nanostructure Modified Carbon Paste Electrode

Abstract

In this research, we report the preparation of a high sensitive voltammetric sensor for electrocatalytic determination of hydroxylamine (HX) in the presence of thiosulfate (TS). We describe the synthesis and characterization of CdO nanoparticles (CdO/NPs) with transmission electron microscopy (TEM) and X‐ray diffraction (XRD) methods. At an optimum condition, the two peaks are separated ca. 0.58 and 0.92 V for HX and TS at the surface of the proposed sensor. Square wave voltammetry (SWV) of HX exhibited two linear dynamic ranges with a detection limit (3σ) of 0.06 µmol L−1. The propose sensor was used for determination of HX in water samples.

Electro-catalytic amplified sensor for determination of N-acetylcysteine in the presence of theophylline confirmed by experimental coupled theoretical investigation

“…On the other hand, BPOFc/BMPF6/NiO-SWCNTs/CPE exhibited an oxidation/reduction signal with ∆Ep = 130 mV that confirms quasi-reversible behavior of BPOFc/BMPF6/NiO-SWCNTs/CPE in the aqueous solution (curve a). The increasing oxidation signal of BPOFc/BMPF6/NiO-SWCNTs/CPE and simultaneous decrease in reduction signal of mediator after addition of 1.0 mM N-acetylcysteine, confirms an EC / interaction 59 , 60 between mediator and N-acetylcysteine on the surface of BPOFc/BMPF6/NiO-SWCNTs/CPE. The comparison of the electro-catalytic oxidation signal of N -acetylcysteine at the surface of BPOFc/BMPF6/NiO-SWCNTs/CPE with its signal at BPOFc/NiO-SWCNTs/CPE and BPOFc/BMPF6/CPE confirmed that the conductivity of electrode surface could be enhanced by the existence of NiO-SWCNTs and BMPF6.…”

Nano-molar level determination of isoprenaline in pharmaceutical and clinical samples; A nanostructure electroanalytical strategy

“…With the advent of modified sensors and greater variability in the manufacture of electrochemical sensors, this technique has been introduced as a serious competitor for chromatographic methods in drug composition analysis [20][21][22][23][24][25][26][27][28][29][30]. The use of nanomaterial-modified sensors has been a major revolution in the design of sensitive sensors in recent years [31][32][33][34][35][36][37][38][39][40][41]. Nanomaterials with wide range application and new properties can be introduced as powerful catalysts in different industries such as electrochemical sensor filed [42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58].…”

Liquid phase analysis of methyldopa in the presence of tyrosine using electrocatalytic effect of a catechol derivative at a surface of NiO nanoparticle modified carbon paste electrode

“…Determination of methyldopa in urine and blood sample in the presence of tyrosine isn't possible at a surface of bare electrodes using electrochemical methods. Application of modified electrodes as sensors can be help to trace analysis of electro-active compounds and resolve signal overlapping in simultaneous analysis [25][26][27][28][29][30][31][32][33][34][35].…”