scholarly journals Carbon Cloth Modified Electrode for the Rapid PB Detection in Water

CONVERTER ◽  
2021 ◽  
pp. 60-69
Author(s):  
Yuxi Zhang, Jingtao Liu, Fengchun Yang
Keyword(s):  
Hydrothermal Treatment ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Catalytic Performance ◽  
Detection Sensitivity ◽  
Carbon Cloth ◽  
Optimal Conditions ◽  
Linear Interval ◽  
Detection Cost

Through simple high-temperature hydrothermal treatment of carbon cloth, a hoCCE electrochemical sensor wasprepared for detecting Pb2+. After hydrothermal treatment, the carbon cloth surface has more ketone-based sitesand defects, which improves the electrochemical active area, conductivity and detection sensitivity, andstrengthens the catalytic performance of Pb2+. Under optimal conditions, the current concentration curve wasobtained by differential pulse anodic stripping voltammetry, with linear range 0.06 - 1.6 μM, regression equationIp(mA) = 0.03208 + 0.12843C (μM), and detection limit 30 nM. The resulting sensor was applied to detect Pb2+ inreal-life water samples. Compared with other studies, hoCCE enjoys advantages in linear interval detection, cost,preparation procedure, and vulnerability.

scholarly journals The effect of tamoxifen on the electrochemical behavior of Bi+3/Bi on the glassy carbon electrode and its determination via differential pulse anodic stripping voltammetry

2019 ◽  
Vol 63 (1) ◽  
Author(s):  
Mehdi Jalali ◽  
Zeinab Deris Falahieh ◽  
Mohammad Alimoradi ◽  
Jalal Albadi ◽  
Ali Niazi
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrochemical Behavior ◽  
Electrochemical Impedance ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Peak Height ◽  
Carbon Electrode

The electrochemical behavior of Bi+3 ions on the surface of a glassy carbon electrode, in acidic media and in the presence of tamoxifen, was investigated. Cyclic voltammetry, chronoamperometry, differential pulse voltammetry, electrochemical impedance spectroscopy, and scanning electron microscopy with energy-dispersive X-ray spectroscopy were used to find the probable mechanism contributing to the reduction of the peak height of bismuth oxidation with an increase in the concentration of tamoxifen. The obtained results show a slight interaction between the bismuth species and tamoxifen which co-deposit on the surface of glassy carbon electrode. Therefore, the reduction in the peak height of bismuth oxidation as a function of tamoxifen concentration was used to develop a new differential pulse anodic striping voltammetry method for determination of trace amount of tamoxifen. The effects of experimental parameters on the in situ DPASV of Bi+3 ions in the presence of tamoxifen shown the optimal conditions as: 2 mol L-1 H2SO4 (1% v v-1 MeOH), a deposition potential of -0.5 V, a deposition time of 60 s, and a glassy carbon electrode rotation rate of 300 rpm. The calibration curve was plotted in the range of 0.5 to 6 µg mL-1 and the limits of detection and quantitation were calculated to be 3.1 × 10-5 µg mL-1 and 1.0 × 10-4 µg mL-1, respectively. The mean, RSD, and relative bias for 0.5 µg mL-1 (n=5) were found to be 0.49 µg mL-1, 0.3%, and 2%, respectively. Finally, the proposed method was successfully used for the determination of tamoxifen in serum and pharmaceutical samples.

scholarly journals Thallium Associated with Manganese Ore Tailings in a Deactivated Mine in the Western Region of Bahia, Brazil

2021 ◽  
Author(s):  
Jorge Luís Santos ◽  
Giuliana Bueno ◽  
Eder Flores ◽  
Oldair Leite ◽  
Clayton Janoni ◽  
...  
Keyword(s):  
Anodic Stripping Voltammetry ◽  
Extraction Procedure ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Rare Metal ◽  
Western Region ◽  
Natural Occurrence ◽  
Flame Atomic Absorption ◽  
The Western Region ◽  
Environmental Agencies

Thallium (Tl) is a rare metal with toxic effects notably harmful to human health and the environment. In this article, the natural occurrence of Tl was evaluated in a deactivated manganese mine located in the Western region of Bahia, Brazil. The extraction procedure with aqua regia was used to dissolve the soil, sediment, and tailings samples. The Tl content was determined by differential pulse anodic stripping voltammetry (DPASV) and manganese (Mn) and iron (Fe) by flame atomic absorption spectroscopy (FAAS). The Tl levels ranged from 0.64 to 473 mg kg‑1, triggering an alert since most of the samples (soil and sediment) analyzed presented Tl concentrations above 1.0 mg kg-1, recognized as the maximum limit recommended by environmental agencies in North America and Europe.

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