Sensitive simultaneous voltammetric determination of the herbicides diuron and isoproturon at a platinum/chitosan bio-based sensing platform.

Autor: Morawski FM; ampere - Laboratório de Plataformas Eletroquímicas - Universidade Federal de Santa Catarina, Departamento de Química, CEP 88040-900, Florianópolis, SC, Brazil., Winiarski JP; ampere - Laboratório de Plataformas Eletroquímicas - Universidade Federal de Santa Catarina, Departamento de Química, CEP 88040-900, Florianópolis, SC, Brazil., de Campos CEM; Universidade Federal de Santa Catarina, Departamento de Física, 88040-900, Florianópolis, SC, Brazil., Parize AL; ampere - Laboratório de Plataformas Eletroquímicas - Universidade Federal de Santa Catarina, Departamento de Química, CEP 88040-900, Florianópolis, SC, Brazil., Jost CL; ampere - Laboratório de Plataformas Eletroquímicas - Universidade Federal de Santa Catarina, Departamento de Química, CEP 88040-900, Florianópolis, SC, Brazil. Electronic address: cristiane.jost@gmail.com.
Jazyk: angličtina
Zdroj: Ecotoxicology and environmental safety [Ecotoxicol Environ Saf] 2020 Dec 15; Vol. 206, pp. 111181. Date of Electronic Publication: 2020 Aug 26.
DOI: 10.1016/j.ecoenv.2020.111181
Abstrakt: Phenylurea herbicides are persistent contaminants, which leads their transport to the surface and ground waters, affecting human and aquatic organisms. Different analytical methods have been reported for the detection of phenylureas; however, several of them are expensive, time-consuming, and require complex pretreatment steps. Here, we show a simple method for the simultaneous electrochemical determination of two phenylurea herbicides by differential pulse adsorptive stripping voltammetry (DPAdSV) using a modified platinum/chitosan electrode. The one-step synthesized platinum/chitosan PtNPs/CS was successfully characterized by TEM, XRPD, and FT-IR, and applied through the sensing platform designated as PtNPs/CS/GCE. This bio-based modified electrode is proposed for the first time for the individual and/or simultaneous electrochemical detection of the phenylurea herbicides diuron and isoproturon compounds extensively used worldwide that present a very similar chemical structure. Electrochemical and interfacial characteristics of the modified electrode were evaluated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). It was found that the oxidation mechanism of diuron and isoproturon occurs in two different pathways, with a peak-to-peak definition of ca. 0.15 V. Under differential pulse adsorptive stripping voltammetry (DPAdSV) optimized conditions, the limit of detection (LOD) was estimated as 7 μg L -1 for isoproturon and 20 μg L -1 for diuron (E d  = +0.8 V; t d  = 100 s). The proposed method was successfully applied to the determination of both analytes in river water samples, at three different levels, with a recovery range of 90-110%. The employment of the bio-based sensing platform PtNPs/CS/GCE allows a novel and easy analytical method to the multi-component phenylurea herbicides detection.
(Copyright © 2020 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: