scholarly journals Facile Synthesized Novel Nanocomposites Modified Electrodes in the Trace Detection of Sulfamethoxazole

2021 ◽  
Author(s):  
Jongte Lalmalsawmi ◽  
Diwakar Tiwari
Keyword(s):  
Electrochemical Impedance ◽  
Anodic Stripping Voltammetry ◽  
Modified Electrodes ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Nanocomposite Material ◽  
The Novel ◽  
Trace Detection ◽  
Aquatic Life ◽  
Trace Measurement

Abstract Micro-pollutants, especially antibiotics contamination in water bodies, are a serious concern, and their detection at a low level is important for human health and even aquatic life at large. The present investigation aims to obtain the novel nanocomposite material precursor to clay and silane. The nanocomposite material is decorated with Ag or Au nanoparticles as obtained indigenously by a green route using natural phytochemicals. The materials were extensively characterized by advanced analytical methods. The nanocomposite materials (Ag(NP)/TCBN and Au(NP)/TCBN) are employed in the selective and efficient trace measurement of sulfamethoxazole (SMZ) in aqueous solutions using the differential pulse anodic stripping voltammetry. The cyclic voltammetric and electrochemical impedance spectroscopic methods showed an increased electroactive surface area as well as faster electron transfer reactions compared to the glassy carbon electrode (GCE). The DPASV measurements at the concentration range of 0.25 mg/L to 30.0 mg/L showed that the novel nanocomposites provide the LOD of 0.022 and 0.036 mg/L, respectively, for the Ag(NP)/TCBN/GCE and Au(NP)/TCBN/GCE for sulfamethoxazole. Further, the application of the method for the detection of sulfamethoxazole in real water samples resulted in an acceptable recovery percentage of 93.08 to 103.7.

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.

Detection of Cadmium using Conjugated Polymer Modified Electrodes

2012 ◽  
Vol 1436 ◽  
Author(s):  
Timothy Ponrathnam ◽  
Seth Robertson ◽  
Junghwan Cho ◽  
Pradeep Kurup ◽  
Ramaswamy Nagarajan
Keyword(s):  
Metal Ions ◽  
Glassy Carbon ◽  
Conjugated Polymer ◽  
Anodic Stripping Voltammetry ◽  
Inductively Couple Plasma ◽  
Modified Electrodes ◽  
Stripping Voltammetry ◽  
Trace Detection ◽  
Polymer Modified Electrodes ◽  
Sampling Procedures

ABSTRACTThe detection of heavy metals in subsurface strata currently requires tedious sampling procedures followed by laboratory analysis using techniques such as atomic absorption spectroscopy (AAS) or inductively couple plasma atomic emission spectroscopy (ICP-AES). These techniques are extremely accurate and capable of detecting very low concentrations of metal ions. The main drawback of these techniques is that they are time consuming, expensive to perform and not portable. A portable sensor capable of detecting metals ion in solution is highly desirable. Anodic Stripping Voltammetry (ASV) can be utilized as a reliable method for the trace detection of metal ions in water. In order to improve the sensitivity of the electrochemical sensor, conjugated polymer films can be coated on the surface of the glassy carbon working electrodes. Stable films of poly (3,4 ethylenedioxythiophene) [PEDOT] and polythiophene copolymer [PTCPTA] were electrochemically synthesized on the surface of a glassy carbon electrode. These polymer modified electrodes were utilized for the detection of cadmium in water. The sensors are capable of detecting trace concentrations of cadmium approaching the maximum contamination limits imposed by the Environment Protection Agency (EPA).

Sensitive determination of lead by differential pulse anodic stripping voltammetry on silver-based coordination complex modified electrodes

2016 ◽  
Vol 8 (8) ◽  
pp. 1935-1941 ◽  
Author(s):  
Yangjuan Wang ◽  
Yuanping Peng ◽  
Yifu Chen ◽  
Kejing Du ◽  
Yijun Li ◽  
...  
Keyword(s):  
Terephthalic Acid ◽  
Anodic Stripping Voltammetry ◽  
Modified Electrodes ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Coordination Complex ◽  
Trace Level ◽  
Anodic Stripping ◽  
Sensitive Determination

A silver-based coordination complex was synthesized from melamine (MA), terephthalic acid (TPA) and silver nitrate for the determination of Pb2+ at the trace level by differential pulse anodic stripping voltammetry (DPASV).

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