摘要
Glyphosate is a herbicide that has been widely used worldwide and is used in agricultural areas to control weeds and unwanted vegetation.Electrochemical sensors developed from different nanomaterials have high efficiency,excellent cost-benefit,and fast analysis time for detecting traces of environmental pollutants.This study aimed to produce an electrochemical sensor with disposable screen-printed electrodes based on carbon black modified with niobium nanoparticles to determine glyphosate in aqueous solutions.The morphology,structure and electrochemical performance of the sensor were characterized by scanning electron microscopy,energy-dispersive X-ray spectroscopy,X-ray diffraction and cyclic voltammetry.Differential pulse voltammetry in BR buffer solution at pH 5.0 allowed the generation of a method to quantify glyphosate concentration in a linear range of 5.90-172.30μmol/L(1.00-29.13μg/mL),with a limit of detection calculated at 3.07μmol/L(0.52μg/mL).The method efficiently quantified glyphosate in real water samples and showed no interference from K^(+),Na^(+),Ca^(2+),Mg^(2+)ions or thiamethoxam,imidacloprid and carbendazim pesticides.
基金
the Coordenacao de Aperfeicoamento de Pessoal de Nível Superior(CAPES)
Conselho Nacional de Desenvolvimento Científico e Tecnológico(CNPq)
Fundacao de Amparo à Pesquisa do Estado do Rio de Janeiro(FAPERJ)(Cincotto Proc.E-26/202.696/2019,Proc.E-26/010.002267/2019 and E-26/210.304/2022)for the financial support
作者简介
Fernando Henrique Cincotto,fernandocincotto@gmail.com,fernandocincotto@iq.ufrj.br
