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Analytical & Bioanalytical Electrochemistry - Volume:11 Issue: 4, Apr 2019

Analytical & Bioanalytical Electrochemistry
Volume:11 Issue: 4, Apr 2019

  • تاریخ انتشار: 1398/02/23
  • تعداد عناوین: 10
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  • Ramachandran Thangarasu, Violet Dhayabaran Victor, Manikandan Alagumuthu * Pages 427-447
    In the present study, a selective and sensitive MnO2/PANI/rGO nanocomposite based electrochemical sensor for the effective finding of methyl parathion (MP) is reported. MnO2/PANI/rGO (where PANI=polyaniline, rGO=reduced graphene oxide) nanocomposite was synthesized through a one-pot chemical polymerization technique and characterized by FTIR, XRD, Raman, HR-TEM, electrochemical (Differential Pulse Voltammetry, cyclic voltammetry amperometry) and impedance techniques. From the results, the excellent electrocatalytic ability of modified MnO2/PANI/rGO nanocomposite film was recognized through the electrode delivery in the reduction process of methyl parathion. Astonishingly, the newly developed sensor showed a compassion of 3.05 μA μM-1 cm-2 with a limit of detection (LOD) 7.4 nM. The high electrocatalytic ability of MnO2, the excellent physicochemical properties of rGO along with large surface area and high conductivity of PANI have contributed much to the exceptional sensing property of the modified electrode. Most prominently, the method of detection is successfully verified in apple, milk and water which proved its potential in real-time applicability for fruit juice and beverages.
    Keywords: Electrochemical Sensor, Nanocomposite, Modified Electrode, Methyl Parathion
  • Mahshid Sabaghi Joni, Arash Fattah, alhossein *, Medi Javidi Pages 448-459
    The influences of solution temperature and immersion time on formed passive film semiconducting behaviors of AZ31B Mg alloy in sodium hydroxide electrolyte (pH=12) under steady-state terms has been investigated applying electrochemical measurements such as Mott–Schottky, impedance spectroscopy and potentiodynamic polarization tests. Mott– Schottky measurements showed the formed passive film on AZ31B magnesium alloy indicates an n-type semiconducting characteristics regardless the immersion time and electrolyte temperature, and the figured donor density rises exponentially by increasing solution temperature and immersion time. While, potentiodynamic polarization data showed that the alloy corrosion and passive current density diminishes as a result of increasing immersion time. Furthermore, the data obtained from impedance spectroscopy revealed that the passive film the reciprocal capacitance being proportional to its thickness, rises by increasing immersion time. It was found that despite the increase in thickness and resistance of passive layer with prolonged immersion time, long immersion times led to favor a less hydrated oxide film the transformation into a more hydrated phase followed via rising the film donor concentration.
    Keywords: AZ31B Mg alloy, Passive film, Electrochemical impedance spectroscopy, Temperature, Mott–Schottky
  • Malathesh Pari, Mounesh, Bhvimane sanna Jilani, K. R. Venugopala Reddy* Pages 460-483
    Title compounds were synthesized by a very simple method by the polymer condensation of the tetracarboxylic metal phthalocyanine with 4–[(Z)Phenyldiazenyl benzene–1,3-diol]. The Proposed method is an excellent method for the synthesis for azo-bridged coupling polymer phthalocyanine. This complex shows very good solubility in many organic solvents like ethanol, THF, DMF and DMSO. The synthesized compounds were subjected for radical scavenging ability using 2, 2-diphenyl-1-picrylhydrazyl (DPPH) and using standard Butylated hydroxyanisole. The compound (4) shows the best scavenging ability among the other tested compound compared to the standard. The electrochemical redox property of the azo-bridged polymer of tetracarboxylic copper phthalocyanine was explored using GCE in buffer solution (pH 4.0). Using Amperometry technique a highly selective and simultaneous determination of DA and AA has been explored at the modified GCE. Amperometric peak currents of dopamine and Ascorbic acid increased linearly with their concentration at the range of 2 μM to 140 μmol L−1 and 0.5 to 400 μmol L−1, with LOD 0.66 μM/L and 0.165 μM/L and slope was 03 μAμM-1 and 8.833 μAμM-1 with a correlation coefficient of 0.9998 and 0.9953. No significant interference for the determination of ascorbic acid and dopamine was detected at 0.4 V during an addition of various compounds.
    Keywords: Soluble metallophthalocyanines, azo-bridged coupling polymer, Spectral studies, Dopamine, Ascorbic acid
  • Alireza Bonakdar, Mohammad Javad Rasaee, Saman Hosseinkhani *, Fatemeh Rahbarizadeh, Fereidoun Mahboudi Pages 484-496
    It is known truncated Nuclear matrix protein 22 (t-NMP22) could be used a biomarker for Bladder cancer. Therefore, in this paper a highly sensitive electrochemical technique was developed based on nanostructures modified glassy carbon (GC) electrode for detection of t-NMP22. In this measurement, immunosensor was fabricated based on the electrodeposition of gold in general the upper frequency limit is determined by the solution resistance, which depends on the specific conductivity of the electrolyte and the electrode radius. To increase the sensitivity of the electrochemical system for detection of t-NMP22, the most important parameters were optimized. The fabrication steps of the immunosensor were characterized by cyclic voltammetry and electrochemical impedance spectroscopy. FFT square wave voltammetry (FFTSWV) was used for measurements at optimum condition. Moreover, the effect of important parameters such pH the FFTSWV parameters were investigated. The modified electrode was used for determination of different concentrations of t-NMP22; a linear range from 0.05 ng/mL to 30 ng/mL and a detection limit of 16.4 pg/mL were obtained. The proposed detection technique does not need a redox probe and was evaluated in urine, which showed good selectivity, high sensitivity and stability, reproducibility.
    Keywords: t-NMP22, Label-free immunosensor, Gold nanoparticles, FFT square wave voltammetry
  • Younes Kerroum, Abdellah Guenbour, Abdelkbir Bellaouchou, Hassane Idrissi, José Garca, Antn, Abdelkader Zarrouk * Pages 497-509
    The global demand for phosphoric fertilizers will increase in the coming years, which should boost phosphoric acid production. And to ensure this production, the choice of the right materials and the search for solutions for the costs of corrosion becomes the challenge of the specialists. This is why this research focused on the corrosion resistance of white cast iron in the similar medium of the phosphoric acid production plants containing fluoride ions at 80 °C. And the techniques used are the electrochemical measurements and UV-Vis-NIR spectroscopy, Scanning electron microscopy and energy dispersive spectroscopy analysis, X-ray diffraction analysis (XRD). The results showed that fluorine influences the electrochemical parameters of the system and favors the dissolution of the alloy, in particular at the ferrite matrix. The increases current density value in the passive region and reduces the passive domain, while causing the partial chemical degradation of the passive film at the potential close to 0.5 V/SCE. And that was explained by that fluoride increases the inter-phase corrosion between the ferrite and carbide phases, and increases the dissolution of iron more than Chromium in the solution, which weakens the resistance to corrosion of the alloy.
    Keywords: Cast iron, Corrosion, Phosphoric acid, Fluoride ions, UV-Vis-NIR spectroscopy
  • Thi Kim Thuong Nguyen *, Thi Huong Giang Le, Van Thang Duong, Tuan Anh Pham Pages 510-521
    A simple, nontoxic, rapid and sensitive method to determine of auramine O in food using glassy carbon electrode was investigated. The cyclic, differential pulse adsorptive stripping voltammetry methods was used to study the electrochemical behavior of auramine O on the glassy carbon electrode in Britton-Robinson buffer. The oxidation peak of the auramine O was irreversible, adsorptive on the surface electrode. Using differential pulse adsorptive stripping voltammetry to determine auramine O with optimal conditions were Britton - Robinson buffer pH 10, adsorption potential 0 V, adsorption time 90 s, pulse amplitude 50 mV, scan rate 25 mV s-1. This process could be used to determination auramine O concentration in the range from 1.0×10-8 mol L-1 to 20.0×10-8 mol L-1 with a detection limit of 2.7×10-9 mol L- 1, quantitation limit 9.0×10-9 mol L-1. We successfully applied the procedure to determine auramine O in spiked chicken meat with mean recovery 90.2±2.1%. The detection limit and the limit of quantification of the auramine O in spiked chicken meat was found to be 0.16 μg g-1 and 0.53 μg g-1, respectively.
    Keywords: Auramine O, Glassy carbon electrode, Differential pulse adsorptive strippingvoltammetry
  • Abdelillah shaim, Mouhsine Galai *, Elhassan Amaterz, Abdeljalil Benlhachemi, Mohamed Ebn Touhami, Abdelkrim Chahine Pages 522-534
    to minimize the metal corrosion, a new glass system (100-x) NaPO3-xTiO2 (x=0 and x=3% mol) have been synthesized the electrochemical and theoretical investigations were used to study their anticorrosive performance for the mild steel (MS) in 3% NaCl medium. NaPO3 and 97 NaPO3-3TiO2 act as great inhibitor for mild steel in 3% NaCl. In the other hand, the surface of the mild steel has been analyzed by the scanning electron microscopy SEM. In addition the inhibition efficiency was found to increase with the increase of the inhibitors concentration and immersion time due to the formation of protective the film on the substrate surface
    Keywords: Polarization, Impedance spectroscopy, SEM, Vitreous phase, 3% NaCl, Mild steel
  • Mohammad Khazaei *, Ali Reza Rahmani, Reza Shokoohi, Abbas Farmany, Mohammad Reza Ganjali Pages 535-545
    A potentiometric electrode was developed for Hg2+ through modifying a carbon paste electrode using Hg2+-ion imprinted polymer and graphitic carbon nitride (g-C3N4). The optimal composition of the developed electrode (Hg2+-IP/g-C3N4/ CPE) was observed for a composition of Hg2+-IP: g-C3N4 nano-sheets: nujol oil: graphite powder at a weight ratio of 5:5:25:65 (w:w). The sensor’s response had a Nernstian slope (30.5±0.4 mVdecade-1 and a short response time of around 10 s, and produced a linear response over a broad concentration window extending from 1.0×10−9 M to 1.0×10−3 M and a detection limit of 4.3×10−10 M was determined for it. Effects of the presence of Na+, K+, Ag+, Ca2+, Mg2+, Cu2+, Ni2+, Zn2+, Cd2+ and Co2+ in the test solution, on the response of Hg2+-IP/g-C3N4/ CPE was evaluated and the sensor was found to be high selectivity. The developed sensor was also evaluated through analyzing the concentration of Hg2+ in different water samples.
    Keywords: Ion-imprinted polymers (IIP), Potentiometric sensors, Mercury determination, Graphitic carbon nitride (g-C3N4), Carbon paste electrode
  • Ali Sobhani, Nasab, Esmail Sohouli *, Nazila Gholipour, Mohammad Hossein Ghanbari Pages 546-555
    An alternative green and new method was proposed for preparing Nb2O5 nanoparticles (NPs). The nano-sized particles were characterized using FT-IR, XRD, EDX, SEM and VSM techniques. The best sample in terms of dimensions was 50-70 nm in size. In order to investigate its electrochemical application, it was used to detect uric acid and CV, DPV and EIS techniques were applied for this purpose. Detection limit 3 μM was achieved using this method for of uric acid.
    Keywords: Nb2O5, Nanoparticles, Green Method, electrochemical, uric acid
  • Maryam Gholami, Saeid Pourmasoud, Vahid Ameri, Ebrahim Naghian, Seyed Ali Mirhosseini * Pages 556-565
    YbVO4 nanoparticles were prepared using sodium tetraphenylborate (Na(B(C6H5)) as a novel capping agent. The effect of the capping agent on the morphology and size of the product particles was studied. The characterization of the particles was performed using X-ray diffraction (XRD), transmission electron microscopy (TEM), and vibrating sample magneto-metery (VSM). The synthesized of YbVO4 NPs nanoparticle was used to investigate the electrochemical behavior of acetaminophen in an aqueous medium using the linear sweep voltammetric (LSV) technique.
    Keywords: YbVO4, Precipitation method, Electrochemical, Acetaminophen