Gold nanoparticles-carbon nanotubes modified sensor for electrochemical determination of organophosphate pesticides

• Published in: Mikrochimica acta (1966) Vol. 165; no. 3-4; pp. 307 - 311
• Main Authors: Zhang, Yan, Kang, Tian-Fang, Wan, Yi-Wen, Chen, Shui-Yuan
• Format: Journal Article
• Language: English
• Published: Vienna Springer Vienna 01.06.2009; Springer
• Subjects: Analytical Chemistry; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Electrochemical methods; Exact sciences and technology; General, instrumentation; Microengineering; Nanochemistry; Nanotechnology; Original Paper; Carbon nanotubes; Gold nanoparticles; Organophosphate pesticides; Parathion; Gold; Nanoparticle; Pesticides; Carbon electrode; Chemical sensor; X ray diffraction; Electrochemical detector; Cyclic voltammetry; Detection limit; Electrodeposition; Organophosphorus compounds; Signal to noise ratio
• ISSN: 0026-3672; 1436-5073
• DOI: 10.1007/s00604-008-0134-y

An electrochemical sensor was developed for the detection of organophosphate pesticides based on electrodeposition of gold nanoparticles on a multi-walled carbon nanotubes modified glassy carbon electrode. Cyclic voltammetry was employed in the process of electrodeposition. Field emission scanning electron microscope and X-ray diffraction techniques were used for characterization of the composite. Organophosphate pesticides (e.g. parathion) were determined using linear scan voltammetry. A highly linear response to parathion in the concentration range from 6.0 × 10 −5 to 5.0 × 10 −7 M was observed, with a detection limit of 1.0 × 10 −7 M estimated at a signal-to-noise ratio of 3. The method has been applied to the analysis of parathion in real samples.