Recovery Of Lanthanide Ions On Silica Adsorbent With Covalently Immobilized Derivative Of 2,6-Pyridinedicarboxylic Acid

2018 ◽  
pp. 192-199
Author(s):  
Olena Artiushenko ◽  
Vladimir Zaitsev ◽  
Wendy Sandoval ◽  
Tatiana D. SaintґPierre
Keyword(s):  
Triamcinolone Acetonide ◽  
Differential Pulse ◽  
Peak Position ◽  
Sweep Rate ◽  
Calibration Graph ◽  
Lanthanide Ions ◽  
Carbon Paste ◽  
Potential Sweep ◽  
Solution Ph ◽  
Carbon Paste Electrodes

The electrochemical properties of triamcinolone acetonide on carbon-paste electrodes have been studied. By the cyclic voltammetry method it was revealed that this steroid is irreversibly reduced at a potential from -0.9 to -1.4 V, depending on the solution pH and the potential sweep rate, while an increase in the sweep rate results in a shift of the peak position to more negative potentials. The limiting stage of the process of reducing triamcinolone acetonide on carbon-paste electrodes is diffusion. The calibration graph was linear in the concentration range from 2 to 46 μmol/L, the detection limit was 1.5 μmol/L. The possibility of using differential pulse voltammetry on carbon-paste electrodes for the determination of the active substance content in ampoules of a suspension of Kenalog 40 was shown.

Determination of chloramphenicol by differential pulse voltammetry at carbon paste electrodes – The use of sodium sulfite for removal of oxygen from electrode surface

2011 ◽  
Vol 76 (5) ◽  
pp. 383-397 ◽  
Author(s):  
Ferenc T. Pastor ◽  
Hana Dejmková ◽  
Jiří Zima ◽  
Jiří Barek
Keyword(s):  
Differential Pulse Voltammetry ◽  
Glassy Carbon ◽  
Sodium Sulfite ◽  
Differential Pulse ◽  
Optimal Conditions ◽  
Carbon Paste ◽  
Tricresyl Phosphate ◽  
Carbon Paste Electrodes ◽  
Pulse Voltammetry

The possibility of determination of chloramphenicol by differential pulse voltammetry at four different carbon paste electrodes, in the full pH range (2–12) of Britton–Robinson (BR) buffer was investigated. Electrodes were prepared by mixing spectroscopic graphite powder or glassy carbon microbeads with mineral oil (Nujol) or tricresyl phosphate. Under optimal conditions (BR buffer pH 12, the electrode prepared from glassy carbon microbeads and tricresyl phosphate), linear calibration graph was obtained only in 10–5 M chloramphenicol concentration range. Determination of lower concentrations of chloramphenicol was complicated by irreproducible peak of oxygen from the carbon paste which overlapped with peak of chloramphenicol. Addition of sodium sulfite removed the oxygen peak without influence on the peak of chloramphenicol. Under optimal conditions (electrode paste made from glassy carbon microbeads, BR buffer pH 10 and 0.5 M sodium sulfite), straight calibration line was obtained in the 10–6 and 10–5 M chloramphenicol concentration range. Limit of determination was 5 × 10–7 mol/l.

scholarly journals Studies on Carbon Materials Produced from Salts with Anions Containing Carbon Atoms for Carbon Paste Electrode

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2480
Author(s):  
Katarzyna Skrzypczyńska ◽  
Andrzej Świątkowski ◽  
Ryszard Diduszko ◽  
Lidia Dąbek
Keyword(s):  
Carbon Materials ◽  
Ammonium Oxalate ◽  
Differential Pulse ◽  
Degree Of Crystallinity ◽  
Carbon Paste ◽  
Turbostratic Carbon ◽  
Carbon Paste Electrodes ◽  
Structure Surface ◽  
Paste Electrode ◽  
Graphene Material

In the presented work, the properties of carbon materials obtained in the reaction of sodium bicarbonate (C–SB) and ammonium oxalate (C–AO) with magnesium by combustion synthesis were investigated. For the materials obtained in this way, the influence of the type of precursor on their properties was analyzed, including: Degree of crystallinity, porous structure, surface topography, and electrochemical properties. It has been shown that the products obtained in magnesiothermic process were found to contain largely the turbostratic carbon forming a petal-like graphene material. Both materials were used as modifiers of carbon paste electrodes, which were then used to determine the concentration of chlorophenol solutions by voltammetric method. It was shown that the peak current determined from the registered differential pulse voltammograms was mainly influenced by the volume of mesopores and the adsorption capacity of 4-chlorophenol for both obtained carbons.

scholarly journals Differential Pulse Voltammetric Determination of Albendazole and Mebendazole in Pharmaceutical Formulations Based on Modified Sonogel Carbon Paste Electrodes with Perovskite-Type LaFeO3Nanoparticles

2016 ◽  
Vol 163 (8) ◽  
pp. B428-B434 ◽  
Author(s):  
Isaac Yves Lopes de Macedo ◽  
Luane Ferreira Garcia ◽  
Aparecido Ribeiro de Souza ◽  
Adélia Maria Lima da Silva ◽  
Carlos Fernandez ◽  
...  
Keyword(s):  
Pharmaceutical Formulations ◽  
Differential Pulse ◽  
Voltammetric Determination ◽  
Carbon Paste ◽  
Carbon Paste Electrodes ◽  
Perovskite Type

Voltammetric Determination of Fluoren-9-ol and 2-Acetamidofluorene Using Carbon Paste Electrodes

2005 ◽  
Vol 70 (3) ◽  
pp. 292-304 ◽  
Author(s):  
Natalija German ◽  
Saulius Armalis ◽  
Jiří Zima ◽  
Jiří Barek
Keyword(s):  
Differential Pulse Voltammetry ◽  
Square Wave Voltammetry ◽  
Limit Of Detection ◽  
Differential Pulse ◽  
Carbon Paste ◽  
Square Wave ◽  
Carbon Paste Electrodes ◽  
Wave Voltammetry ◽  
Pulse Voltammetry

Square wave voltammetry and differential pulse voltammetry have been used for the determination of 2-acetamidofluorene and fluoren-9-ol using carbon paste electrodes, following the study of the influence of the carbon paste composition on the voltammetric signals of the analytes. The methods are based on the oxidation of the above compounds and they include adsorptive accumulation of the analyte on the surface of the working electrode. The limit of detection was 1 μmol l-1for fluoren-9-ol in a medium of 0.1 M H2SO4, and 40 nmol l-1for 2-acetamidofluorene in Britton-Robinson buffer (pH 7).

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