Electrochemical behavior study of some selected phenylurea herbicides at activated pencil graphite electrode. Electrooxidation of linuron and monolinuron

• Published in: Microchemical journal 2019-06, Vol.147, p.1109-1116
• Main Authors: Buleandra, Mihaela, Popa, Dana Elena, David, Iulia Gabriela, Bacalum, Elena, David, Victor, Ciucu, Anton Alexandru
• Format: Article
• Language: English
• Subjects: Electrochemically treated; Electrooxidation; Herbicides; Sensor; Simultaneous determination; Voltammetry
• ISSN: 0026-265X; 1095-9149
• DOI: 10.1016/j.microc.2019.04.042

A novel and rapid voltammetric assay for the simultaneous determination of monolinuron (MLN) and linuron (LIN) using an electrochemically pretreated pencil graphite electrode (PGE*) is reported for the first time. Enhanced oxidation peak currents of MLN and LIN were observed at PGE* when compared with electrochemically non-pretreated PGE. Differential pulse voltammetric (DPV) results showed distinct anodic peaks at 1.064 V and 1.170 V for MLN and LIN, respectively. Under optimum conditions, the detection limits were 3.7 × 10−7 mol L−1 and 5.8 × 10−7 mol L−1 for MLN and LIN respectively. The DPV method was applied for the quantitative determination of the mentioned compounds in spiked tap water samples enriched by solid phase extraction. The voltammetric results were in good agreement with high-performance liquid chromatography data. •Electrochemically activated pencil graphite electrode (PGE*)•Simultaneous electroanalytical determination of LIN and MLN at PGE* without previous separation•The detection limits were 5.8·10−7 M for LIN and 3.7·10−7 M for MLN.•Voltammetric determination of LIN and MLN in spiked tap water matrices enriched by solid phase extraction using PGE*