Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang, Padang 25131, Indonesia.
Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, Tanjong Malim 35900, Perak, Malaysia.
Sensors (Basel). 2023 Oct 10;23(20):8366. doi: 10.3390/s23208366.
The fabrication of a zinc hydroxide nitrate-sodium dodecylsulfate bispyribac modified with multi-walled carbon nanotube (ZHN-SDS-BP/MWCNT) paste electrode for uric acid and bisphenol A detection was presented in this study. Electrochemical impedance spectroscopy, chronocoulometry, square-wave voltammetry, and cyclic voltammetry were all used to examine the electrocatalytic activities of modified paste electrodes. The modified electrode's sensitivity and selectivity have been considered in terms of the composition of the modifier in percentages, the types of supporting electrolytes used, the pH of the electrolyte, and square-wave voltammetry parameters like frequency, pulse size, and step increment. Square-wave voltammetry is performed by applying a small amplitude square-wave voltage to a scanning potential from -0.3 V to +1.0 V, demonstrating a quick response time and high sensitivity. The ZHN-SDS-BP/MWCNT sensor demonstrated a linear range for uric acid and bisphenol A from 5.0 µM to 0.7 mM, with a limit of detection of 0.4 µM and 0.8 µM, respectively, with good reproducibility, repeatability, and stability as well. The modified paste electrode was successfully used in the determination of uric acid and bisphenol A in samples of human urine and lake water.
本研究提出了一种基于多壁碳纳米管修饰的硝酸锌-十二烷基硫酸钠-双吡咯烷酮（ZHN-SDS-BP/MWCNT）糊剂电极用于尿酸和双酚 A 检测的制备方法。电化学阻抗谱、计时库仑法、方波伏安法和循环伏安法都被用于研究修饰糊剂电极的电催化活性。修饰电极的灵敏度和选择性是根据修饰剂的组成百分比、所用支持电解质的类型、电解质的 pH 值以及方波伏安法的参数（如频率、脉冲大小和阶跃增量）来考虑的。方波伏安法是通过在扫描电位从-0.3 V 到+1.0 V 之间施加小振幅的方波电压来进行的，该方法具有快速响应时间和高灵敏度。ZHN-SDS-BP/MWCNT 传感器对尿酸和双酚 A 的线性范围分别为 5.0 µM 至 0.7 mM，检测限分别为 0.4 µM 和 0.8 µM，具有良好的重现性、重复性和稳定性。该修饰糊剂电极成功地用于人尿和湖水样品中尿酸和双酚 A 的测定。
