Simultaneous determination of dopamine, uric acid and ascorbic acid with LaFeO3 nanoparticles modified electrode

Autor:	Shoufeng Jiao, Wei Zhang, Guangfeng Wang, Bin Fang, Jingao Sun
Rok vydání:	2008
Předmět:	Detection limit chemistry.chemical_compound Chemistry Electrode Analytical chemistry Buffer solution Cyclic voltammetry Electrochemistry Ascorbic acid Amperometry Analytical Chemistry Nuclear chemistry Dielectric spectroscopy
Zdroj:	Microchimica Acta. 164:357-362
ISSN:	1436-5073 0026-3672
Popis:	LaFeO3 nanoparticles of approximately 22 nm in size were synthesized and characterized by XRD and TEM. A novel glassy carbon electrode modified with LaFeO3 nanoparticles was constructed and characterized by electrochemical impedance spectroscopy and cyclic voltammetry. The modified electrode exhibited strong promoting effect and high stability toward the electrochemical oxidation of dopamine (DA), which gave reversible redox peaks with a formal potential of 0.145 V (vs. Ag/AgCl) in pH 7.0 phosphate buffer solution. The anodic peak current (measured by constant potential amperometry) increased linearly with the concentration of dopamine in the range from 1.5 × 10−7 to 8.0 × 10−4 M. The detection limit was 3.0 × 10−8 M. The relative standard deviation of eight successive scans was 3.47% for 1.0 × 10−6 M DA. The interference by ascorbic acid was eliminated efficiently. The method was used to determine DA in dopamine hydrochloride injections and showed excellent sensitivity and recovery.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a0ad772b95e1ffcbc3ba40f088f8a230 https://doi.org/10.1007/s00604-008-0066-6 Zobrazit plný text záznamu Full text from SpringerLink