傅里叶变换红外光谱
重复性
扫描电子显微镜
材料科学
再现性
电化学气体传感器
化学
分析化学(期刊)
氧化铈
吸附
电化学
氧化物
色谱法
化学工程
电极
物理化学
复合材料
工程类
冶金
作者
Moisés Barbosa de Souza,Jaqueline Silva Santos,Montcharles da Silva Pontes,Letícia R. Nunes,Ivan Pires de Oliveira,Alvaro J. Lopez Ayme,Etenaldo Felipe Santiago,Renato Grillo,Antonio Rogério Fiorucci,Gilberto José de Arruda
标识
DOI:10.1016/j.scitotenv.2021.150348
摘要
A new highly sensitive, selective, and inexpensive electrochemical method has been developed for simultaneously detecting diethylstilbestrol (DES) and 17β-estradiol (E2) in environmental samples (groundwater and lake water) using a graphite sensor modified by cerium oxide nanoparticles (CPE-CeO2 NPs). The developed sensor and the materials used in its preparation were characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The ab initio simulation was used to evaluate the adsorption energies between both DES and E2 with the surface of the sensor. The peak current of oxidation of both hormones showed two regions of linearity. The region of greatest sensitivity was observed for the linear range of 10 nM-100 nM. The detection and quantification limits for this concentration range were 0.8/2.6 nM and 1.3/4.3 nM for DES and E2, respectively. The analytical performance of the developed method showed high sensitivity, precision, repeatability, reproducibility, and selectivity. The CPE-CeO2 NPs sensor was successfully applied to simultaneously detect DES and E2 in real samples with recovery levels above 98%.
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