Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg D. Obradovića 3, 21000 Novi Sad, Serbia.
Molecules. 2011 May 27;16(6):4451-66. doi: 10.3390/molecules16064451.
Two types of bismuth modified electrodes, a bismuth-film modified glassy carbon (BiF-GCE) and a bismuth bulk modified carbon paste, were applied for the determination of selected nitroguanidine neonicotinoid insecticides. The method based on an ex situ prepared BiF-GCE operated in the differential pulse voltammetric (DPV) mode was applied to determine clothianidin in the concentration range from 2.5 to 23 μg cm⁻³ with a relative standard deviation (RSD) not exceeding 1.5%. The tricresyl phosphate-based carbon paste electrodes (TCP-CPEs), bulk modified with 5 and 20 w/w% of bismuth, showed a different analytical performance in the determination of imidacloprid, regarding the peak shape, potential window, and noise level. The TCP-CPE with 5% Bi was advantageous, and the developed DPV method based on it allowed the determination in the concentration range from 1.7 to 60 μg cm⁻³ with an RSD of 2.4%. To get a deeper insight into the morphology of the bismuth-based sensor surfaces, scanning electron microscopic measurements were performed of both the surface film and the bulk modified electrodes.
两种类型的铋修饰电极，铋膜修饰的玻碳电极（BiF-GCE）和铋整体修饰的碳糊电极，被应用于测定选定的硝基胍新烟碱类杀虫剂。该方法基于在体外制备的 BiF-GCE 在差分脉冲伏安法（DPV）模式下运行，用于在 2.5 至 23 μg cm⁻³ 的浓度范围内测定噻虫啉，相对标准偏差（RSD）不超过 1.5%。基于磷酸三氯乙酯的碳糊电极（TCP-CPE），整体修饰有 5%和 20%w/w%的铋，在测定吡虫啉时表现出不同的分析性能，包括峰形、电位窗口和噪声水平。5% Bi 的 TCP-CPE 具有优势，基于该电极建立的 DPV 方法允许在 1.7 至 60 μg cm⁻³ 的浓度范围内进行测定，RSD 为 2.4%。为了更深入地了解基于铋的传感器表面的形态，对表面膜和整体修饰电极进行了扫描电子显微镜测量。
