Journal
CHEMOSPHERE
Volume 312, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.137192
Keywords
Pt; SWCNTs nanocomposite; Carbidopa; Sensor; Modified electrode
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In this study, an analytical approach based on electrode surface modification by Pt/SWCNTs as a sensor was proposed to monitor the concentration of carbidopa in an aqueous solution. Pt/SWCNTs nanocomposite was synthesized using a polyol strategy and characterized by TEM. The carbon paste electrode modified with Pt/SWCNTs showed enhanced oxidation signal and decreased oxidation potential for carbidopa, with a linear dynamic range of 1.0 nM-120 M and a detection limit of 0.5 nM at pH = 7.0. The CPEM/Pt/SWCNTs sensor can detect carbidopa in water and dextrose saline with an acceptable recovery range.
Herein, to monitor the concentration of carbidopa in an aqueous solution, an analytical approach based on electrode surface modification by Pt/SWCNTs as a sensor has been proposed. Pt/SWCNTs was synthesized by polyol strategy and characterized by the TEM method. Results confirmed spherical Pt nanoparticles with a diameter of about 10 nm decorated at the surface of SWCNTs with good distribution. The carbon paste electrode modified (CPEM) with Pt/SWCNTs was fabricated by mixing 12% of nanocomposite as an optimum condition with graphite powder in the presence of paraffin oil as a binder. Carbidopa's oxidation signal was enhanced by about 2.73 times when using the CPEM/Pt/SWCNTs, and its oxidation potential was decreased by about 110 mV. Additionally, the sensor demonstrated a linear dynamic range of 1.0 nM-120 M with a detection limit of 0.5 nM at pH = 7.0 as the ideal condition for monitoring carbidopa. Therefore, carbidopa in water and dextrose saline can be detected using CPEM/Pt/SWCNTs with an acceptable recovery range.
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