Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei, 106, Taiwan.
Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei, 106, Taiwan.
Ecotoxicol Environ Saf. 2021 Jan 1;207:111285. doi: 10.1016/j.ecoenv.2020.111285. Epub 2020 Sep 15.
The present work scrutinized the voltammetric analysis of hazardous herbicide aclonifen (ACF) in actual soil and river water samples utilizing the electrochemical method. The electrochemical sensing device was fabricated for the determination of ACF using gadolinium niobate (GdNbO) nanoparticles modified glassy carbon electrode (GCE). The novel GdNbO sensing material was prepared via a simple co-precipitation method. Several characterization techniques (TEM, EDS, XRD, XPS, and BET) were utilized to analyze the structural features of the GdNbO. The enhanced electrochemical behavior of GdNbO modified GCE towards ACF was observed compared to bare GCE. The cyclic voltammetry response revealed that the prepared sensor shows the lower negative potential with a dramatic increase in the peak current of ACF compared to bare GCE. In the differential pulse voltammetry, the limit of detection (1.15 nM) and sensitivity (23 μA μM cm) of the ACF on the GdNbO modified GCE was comparatively superior to the formerly proposed ACF based sensor. This sensor reveals good selectivity, repeatability, reproducibility, and long-term stability. The reliability of the sensor exhibits satisfactory recovery results for ACF detection in river water and soil samples.
本工作利用电化学方法仔细研究了在实际土壤和河水样品中测定危险除草剂氯苯氧乙酸（ACF）的伏安分析。使用钆铌酸盐（GdNbO）纳米粒子修饰的玻碳电极（GCE）制备了用于测定 ACF 的电化学传感装置。通过简单的共沉淀法制备了新型 GdNbO 传感材料。利用透射电子显微镜（TEM）、能谱（EDS）、X 射线衍射（XRD）、X 射线光电子能谱（XPS）和比表面积测试（BET）等多种表征技术对 GdNbO 的结构特征进行了分析。与裸 GCE 相比，GdNbO 修饰的 GCE 对 ACF 的电化学行为得到了增强。循环伏安法响应表明，与裸 GCE 相比，制备的传感器显示出更低的负电势，并且 ACF 的峰电流明显增加。在差分脉冲伏安法中，与以前提出的基于 ACF 的传感器相比，GdNbO 修饰的 GCE 上 ACF 的检测限（1.15 nM）和灵敏度（23 μA μM cm）更高。该传感器表现出良好的选择性、重复性、重现性和长期稳定性。传感器的可靠性在河水和土壤样品中 ACF 检测方面显示出令人满意的回收率结果。
