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Citation: TANG Qian, CHEN Meng-Ni, ZHU Guo-Dong, LIU Jian-Yun. Simultaneous Detection of Dopamine, Ascorbic Acid and Uric Acid by Palladium-Zinc Oxide Nanotube Modified Electrode[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(9): 1177-1184. doi: 10.19756/j.issn.0253-3820.201241 shu

Simultaneous Detection of Dopamine, Ascorbic Acid and Uric Acid by Palladium-Zinc Oxide Nanotube Modified Electrode

1.
College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China;
2.
Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China

Received Date: 28 April 2020
Revised Date: 23 June 2020

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 21776045).

Palladium-zinc oxide (Pd-ZnO) hollow nanotubes were prepared by using PdCl₂ and Zn(Ac)₂ as raw material through electrospinning technique combined with high temperature calcination. The presence of Pd improved the distribution of ZnO. Scanning electron microscopy, transmission electron microscopy and X-ray diffraction characterization confirmed the formation of the Pd-ZnO hollow nanofiber with an inner diameter of 240 nm. Pd nanoparticles (PdNPs) with the size of 80 nm were distributed uniformly on the nanotubes. X-ray photoelectron spectroscopy proved that PdNPs mainly existed in the form of PdO. The obtained Pd-ZnO modified glassy carbon electrode exhibited excellent catalytic activity for the oxidation of dopamine (DA), ascorbic acid (AA) and uric acid (UA). Differential pulse voltammetry was successfully applied for the simultaneous measurement of DA, AA and UA without mutual interference. The linear concentration ranges of DA, AA and UA were 3.0×10^-7 -3.0×10^-5 mol/L (R²=0.9967), 1.0×10^-5 -1.0×10^-3 mol/L (R²=0.9991) and 6.0×10^-6 -6.0×10^-4 mol/L (R²=0.9935), with the corresponding detection limits (S/N=3) of 1.0×10^-8 mol/L, 1.0×10^-6 mol/L and 3.0×10^-6 mol/L, respectively. The Pd-ZnO electrode with good reproducibility and stability was applicable for the simultaneous measurement of DA, AA and UA.
- Dopamine,
- Ascorbic acid,
- Uric acid,
- Palladium,
- Zinc oxide,
- Differential pulse voltammetry
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