New cobalt(II)-based electrocatalyst for reduction of trichloroacetic acid and bromate

2010 ◽  
Vol 75 (6) ◽  
pp. 637-647 ◽  
Author(s):  
Rui Rui Zhuang ◽  
Fang Fang Jian ◽  
Ke Fei Wang
Keyword(s):  
Detection Limit ◽  
Trichloroacetic Acid ◽  
Carbon Powder ◽  
Carbon Paste ◽  
Rapid Preparation ◽  
Practical Applications ◽  
X Ray Crystallography ◽  
Mixing Method ◽  
Technical Simplicity ◽  
Paste Electrode

A novel cobalt(II) complex trans-[Co(C6H11N3)4(SCN)2] (C6H11N3 = 1-butyl-1H-1,2,4-triazole) was synthesized and characterized by X-ray crystallography, IR spectroscopy and elemental analysis. The cobalt center is six-coordinate, CoIIN6, the axial positions being occupied by the isothiocyanate ligands and the equatorial positions by the 1-butyl-1H-1,2,4-triazole ligands. A conductive carbon paste electrode (Co-CPE), comprised of the studied complex and a carbon powder, was fabricated by the direct mixing method. The electrochemical behavior and electrocatalytic performance of Co-CPE were studied by cyclic voltammetry. The Co-CPE shows electrocatalytic activities toward the reduction of trichloroacetic acid and bromate. The detection limit and sensitivity are 0.01 μmol dm–3 and 76.86 μA μmol–1 dm3 for trichloroacetic acid, and 0.02 μmol dm–3 and 96.19 μA μmol–1 dm3 for bromate, respectively. The modified electrode features good reproducibility, high stability, low detection limit, technical simplicity and rapid preparation, which is important for practical applications.

scholarly journals A new zinc complex of 1-propyl-1H-benzo[d] imidazole: synthesis, characterization and electrocatalysis

2010 ◽  
Vol 8 (3) ◽  
pp. 646-651
Author(s):  
Rui Zhuang ◽  
Fang Jian ◽  
KeFei Wang
Keyword(s):  
Detection Limit ◽  
Trichloroacetic Acid ◽  
Zinc Complex ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Tetrahedral Geometry ◽  
Rapid Preparation ◽  
Practical Applications ◽  
X Ray Crystallography ◽  
And Performance

AbstractThe present work reports the synthesis, characterization and performance of a new zinc(II) complex of [Zn(C3H7-bim)2Br2] (bim = benzimidazole) as electrocatalyst for trichloroacetic acid and bromate reduction. Its structure was characterized by X-ray crystallography, IR spectroscopy and elemental analysis. The zinc atom adopts a distorted tetrahedral geometry by coordinating to two bromine atoms and two nitrogen atoms from two 1-propyl-1H-benzo[d]imidazole ligands. The electrochemical behavior and electrocatalysis of the zinc complex bulk-modified carbon paste electrode (Zn-CPE) have been studied by cyclic voltammetry. The Zn-CPE shows good electrocatalytic activities toward the reduction of trichloroacetic acid and bromate. The detection limit and the sensitivity are 0.05 μM, 67.43 μA μM−1 for trichloroacetic acid detection, and 0.02 μM, 69.94 μA μM−1 for bromate detection, respectively. This modified electrode shows good reproducibility, high stability, low detection limit, technical simplicity and possibility of rapid preparation, which is important for practical applications.

scholarly journals Electrochemical characterisation of novel screen-printed carbon paste electrodes for voltammetric measurements

2017 ◽  
Vol 82 (7-8) ◽  
pp. 865-877 ◽  
Author(s):  
Milan Sýs ◽  
Elmorsy Khaled ◽  
Radovan Metelka ◽  
Karel Vytřas
Keyword(s):  
Glassy Carbon ◽  
Carbon Paste Electrode ◽  
Carbon Powder ◽  
Carbon Paste ◽  
Surface Characterisation ◽  
Carbon Paste Electrodes ◽  
Screen Printed Electrodes ◽  
Paste Electrode ◽  
Carbon Based ◽  
Screen Printed

This work is focused on the homemade screen-printed carbon paste electrode containing basically graphite powder (or glassy carbon powder), poly(vinylbchloride) (PVC) and paraffin oil. It compares the electrochemical properties of conventional carbon-based electrodes and prepared screen-printed carbon paste electrodes towards [Fe(CN)6]3-/[Fe(CN)6]4- and quinone/hydroquinone redox couples. Significant attention is paid to the development of the corresponding carbon inks, printing and the surface characterisation of the resulting electrodes by the scanning electron microscopy. An optimization consisted of the selection of the organic solvent, the optimal content of the used polymer with the chosen paste binder, appropriate isolation of electric contact, etc. Very similar properties of the prepared screen-printed electrodes, containing only corresponding carbon powder and 3 % PVC, with their conventional carbon paste electrode and glassy carbon-based electrodes, were observed during their characterisation. Screen-printed electrodes, with the pasting liquid usually provided satisfactory analytical data. Moreover, they can be used in the flow injection analysis and could undoubtedly replace the carbon paste grooved electrodes. It can be assumed that certain progress in the development of electrode materials was achieved by this research.

Electroanalysis of some catecholamines at a single-wall nanotubes modified carbon paste electrode

2010 ◽  
Vol 75 (12) ◽  
pp. 1217-1228 ◽  
Author(s):  
Zuzana Jemelková ◽  
Jiří Zima ◽  
Jiří Barek
Keyword(s):  
Carbon Paste Electrode ◽  
Limit Of Detection ◽  
Mammalian Species ◽  
Amperometric Detection ◽  
Single Wall Carbon Nanotubes ◽  
Modified Carbon Paste Electrode ◽  
Carbon Powder ◽  
Carbon Paste ◽  
Buffer Solution ◽  
Paste Electrode

Catecholamines (CAs) are important neurotransmitters and hormones in mammalian species. They are highly reactive and are readily oxidized to aminochromes. That enables the use of electrochemical method for their determination. In this paper, differential pulse voltammetric (DPV) determination and HPLC with amperometric detection of dopamine (D), epinephrine (E), norepinephrine (NE) andL-Dopa (DOPA) is developed and optimized. The carbon paste electrode (CPE) prepared of carbon powder CR2 and single-wall carbon nanotubes (SWCNT) (50:50 m/m) was used. The miniaturized body for CPE was used to reduce consumption of all chemicals. In Britton–Robinson buffer solution pH 6, the limits of detection 1 × 10–6, 2 × 10–6, 2 × 10–6and 8 × 10–6mol dm–3have been found for DPV determination of D, E, NE and DOPA, respectively. HPLC was carried out using 0.1Mphosphate buffer pH 3:methanol (95:5) mobile phase containing 10 mMEDTA. The above described CPE in a wall-jet arrangement was used for amperometric detection. The limit of detection of each analyte in a mixture was 2 × 10–6mol dm–3. Practical application of this method on spiked urine samples was verified.

scholarly journals Development of a Carbon Paste Electrode Containing Benzo-15-Crown-5 for Trace Determination of the Uranyl Ion by Using a Voltammetric Technique

2009 ◽  
Vol 92 (1) ◽  
pp. 241-247 ◽  
Author(s):  
Sunil K Agrahari ◽  
Sangita D Kumar ◽  
Ashwini K Srivastava
Keyword(s):  
Detection Limit ◽  
Differential Pulse Voltammetry ◽  
Modified Electrode ◽  
Carbon Paste Electrode ◽  
Electrochemical Impedance ◽  
Differential Pulse ◽  
Carbon Paste ◽  
Pulse Voltammetry ◽  
Paste Electrode

Abstract The interaction of macrocyclic compounds like crown ethers and UO22+ has been studied by electrochemical methods. A modified carbon paste electrode incorporating benzo-15-crown-5 (B15C5) was used to evaluate the electron transfer reaction of UO22+ by cyclic voltammetry, differential pulse voltammetry, and electrochemical impedance spectroscopy. Electrochemical impedance studies showed that charge transfer resistance was less for the B15C5-modified electrode than for the plain carbon paste electrode (PCPE). On the basis of these observations, a UO22+-sensitive crown ether chemically modified electrode (CME) for trace analysis was fabricated and investigated in aqueous solutions. It was found that a 5 B15C5CME for UO22+ showed a better voltammetric response than did the PCPE. UO22+ could be quantified at sub-μg/mL levels by differential pulse voltammetry with a detection limit of 0.03 μg/mL. By differential pulse adsorptive stripping voltammetry, UO22+ could be quantified in the working range of 0.002-0.2 μg/mL, with a detection limit of 1.1 μg/L. Simultaneous determination of UO22+, Pb2+, and Cd2+ was possible. The method was successfully applied to the determination of UO22+ in synthetic, as well as real, samples; the results were found to be comparable to those obtained by inductively coupled plasma-atomic emission spectroscopy.

Electrochemical Inspection of the Interaction of Double Strand ds-DNA with Carmine on Nanometer TiO2 Doped Carbon Paste Electrode

2011 ◽  
Vol 287-290 ◽  
pp. 37-42
Author(s):  
Ming Ming Ma ◽  
Zhi Tong ◽  
Jia Biao Yang
Keyword(s):  
Detection Limit ◽  
Carbon Paste Electrode ◽  
Azo Dye ◽  
Electrochemical Method ◽  
Fluorescence Spectra ◽  
Modified Carbon Paste Electrode ◽  
Oxidation Peak ◽  
Carbon Paste ◽  
Fish Sperm ◽  
Paste Electrode

The interaction of the single azo dye, carmine with fish-sperm dsDNA is inspected in pH 3.2 H2SO4with electrochemical method on the surface of nanometer TiO2modified carbon paste electrode. After the addition of dsDNA, the peak currents of oxidation and reduction peaks of carmine decrease with a positive shift of potential, indicating that intercalation interaction between the dye and dsDNA is taken place. This is consistent with fluorescence spectra results. The binding constant and binding ratio is calculated as 4.92×108and 1:2, respectively. Furthermore, the decrease in the oxidation peak currents is found proportional to dsDNA concentration in the range of 21.24-127.44 μg·mL-1 with a detection limit of 16.04 μg•mL-1.

scholarly journals Pengembangan Elektroda Pasta Karbon termodifikasi Molecularly Imprinted Polymer sebagai Sensor Potensiometri Asam Urat

2016 ◽  
Vol 1 (2) ◽  
pp. 65
Author(s):  
Mirartul Khasanah ◽  
Handoko Darmokoesoemo ◽  
Nesti Widayanti
Keyword(s):  
Uric Acid ◽  
Detection Limit ◽  
Molecularly Imprinted Polymer ◽  
Measurement Range ◽  
Carbon Paste ◽  
Imprinted Polymer ◽  
Ph Optimum ◽  
Molecularly Imprinted ◽  
Cross Linker ◽  
Paste Electrode

ABSTRAK            Pengembangan elektroda pasta karbon/molecularly imprinted polymer (MIP) sebagai sensor untuk analisis asam urat secara potensiometri telah dilakukan. MIP dibuat dari monomer metil metakrilat, cross-linker etilen glikol dimetakrilat, dan asam urat sebagai template. Elektroda yang memberikan kinerja optimum dibuat dengan komposisi karbon, MIP, dan parafin 40:25:35(%b/b). Pengukuran larutan asam urat dilakukan pada pH optimum 5. Kinerja elektroda dinyatakan dengan nilai faktor Nernst sebesar 30,19 mV/dekade dengan jangkauan pengukuran 10-6-10-3 M, koefisien variasi 1,36-2,03%, akurasi 63,9-166,0 % dan batas deteksi bawah sebesar 3,03x10-6 M. Pengukuran asam urat dengan elektroda ini tidak diganggu oleh keberadaan urea yang ditunjukkan dengan nilai koefisien selektivitas (Kij) kurang dari satu. Elektroda ini memiliki waktu respon kurang dari dua menit dan waktu hidup selama delapan minggu dengan 104 kali pemakaian. Kata kunci: elektroda pasta karbon, MIP, potensiometri, asam urat ABSTRACTCarbon paste electrode modified molecularly imprinted polymer (MIP) as a sensor to analyze uric acid by potentiometry has been developed. MIP was synthesized by mixing methyl methacrylate as monomer, etylene glycol dimethacrylic acid as cross-linker, and uric acid as template. The electrode which showed the best performance was manufactured by ratio of carbon, MIP, and paraffin of 40:25:35 (w/w). The developed electrode showed the optimum performance on the uric acid pH 5. The performances of carbon paste/MIP electrode was expressed by Nernst factor of 30.19 mV/decade, measurement range of 10-6-10-3 M, the coefficient of variation (CV) of 1.36-2.03% and accuracy of 63.9-166.0%. The detection limit of this method was 3.03x10-6 M. Analysis of uric acid using the electrode was not interfered by urea. The developed electrode showed the response time less than 2 minutes, while lifetime of the electrode was 8 weeks (104 times usage). Keyword : carbon paste electrode, MIP, potentiometry, uric acid

scholarly journals Voltammetric Determination of Pb(II) by a Ca-MOF-Modified Carbon Paste Electrode Integrated in a 3D-Printed Device

Sensors ◽  
2020 ◽  
Vol 20 (16) ◽  
pp. 4442 ◽  
Author(s):  
Evaggelia Vlachou ◽  
Antigoni Margariti ◽  
Giannis S. Papaefstathiou ◽  
Christos Kokkinos
Keyword(s):  
Carbon Paste Electrode ◽  
Limit Of Detection ◽  
Metal Organic Framework ◽  
Modified Carbon Paste Electrode ◽  
Fish Feed ◽  
Carbon Paste ◽  
Operational Parameters ◽  
Practical Applications ◽  
3D Printed ◽  
Paste Electrode

In this work, a voltammetric method based on a metal organic framework (Ca-MOF)-modified carbon paste electrode for lead determination was developed. The MOF-based electrode was packed in a new type of 3D-printed syringe-type integrated device, which was entirely fabricated by a dual extruder 3D printer. After optimization of the operational parameters, a limit of detection of 0.26 µg L−1 Pb(II) was achieved, which is lower than that of existing MOF-based lead sensors. The device was used for Pb(II) determination in fish feed and bottled water samples with high accuracy and reliability. The proposed sensor is suitable for on-site analyses and provides a low-cost integrated transducer for the ultrasensitive routine detection of lead in practical applications.

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