State Key Laboratory of Resource Insects, Southwest University, 400716 Chongqing, PR China; College of Sericulture, Textile and Biomass Sciences, Southwest University, 400716 Chongqing, PR China.
State Key Laboratory of Resource Insects, Southwest University, 400716 Chongqing, PR China; College of Sericulture, Textile and Biomass Sciences, Southwest University, 400716 Chongqing, PR China; Chongqing Institute for Food and Drug Control, Chongqing 401121, PR China.
Sci Total Environ. 2024 Nov 10;950:175346. doi: 10.1016/j.scitotenv.2024.175346. Epub 2024 Aug 6.
Nitrite is a common nitrogen-containing compound that possesses high biological toxicity, thereby posing a serious threat to aquatic organisms. Therefore, it is imperative to develop a rapid and quantitative determination approach for nitrite. In this study, the aim was to prepare a novel electrochemical sensor to determine nitrite. This was achieved by synthesizing Au/Zn dendritic complexes on a carbon cloth self-supported electrode after plasma treated by a stepwise strategy of electrodeposition and in-situ corrosion. In accordance with the optimal experimental conditions, the electrode exhibited remarkable catalytic activity for the electrooxidation of nitrite ions (pH = 8.0), accompanied by a considerable enhancement in peak anodic current in comparison to the unmodified electrode. The sensor exhibited a wide linear range (1-833 μM, 833-8330 μM), high sensitivity (3506 μA mM cm, 538 μA mM cm), a low detection limit (0.43 μM), and excellent selectivity, reproducibility, and stability for the determination of nitrite. Furthermore, the prepared sensor was successfully applied to the detection of nitrite in tap water, fish holding pond water and duck pond water, demonstrating good recovery and no significant difference from the spectrophotometric results. The results suggest that the electrochemical sensor developed in this study represents a straightforward yet efficacious approach to the development of advanced portable sensors for aquaculture applications.
亚硝酸盐是一种常见的含氮化合物，具有很高的生物毒性，对水生生物构成严重威胁。因此，开发一种快速定量测定亚硝酸盐的方法迫在眉睫。本研究旨在制备一种新型电化学传感器来测定亚硝酸盐。通过采用分步电沉积和原位腐蚀的方法，在等离子体处理后的碳布自支撑电极上合成 Au/Zn 树枝状复合物来实现这一目标。根据最佳实验条件，该电极对亚硝酸盐离子的电氧化表现出显著的催化活性，与未修饰电极相比，峰阳极电流有了相当大的增强。传感器在 1-833 μM（833-8330 μM）范围内具有较宽的线性范围、高灵敏度（3506 μA·mM-1·cm-2，538 μA·mM-1·cm-2）、低检测限（0.43 μM），以及对亚硝酸盐的出色选择性、重现性和稳定性。此外，所制备的传感器成功应用于自来水中、养殖池塘水和鸭塘水中的亚硝酸盐检测，回收率良好，与分光光度法结果无显著差异。结果表明，本研究中开发的电化学传感器为水产养殖应用中先进便携式传感器的开发提供了一种简单而有效的方法。
