Simultaneous determination of antinonin and trifluralin by electrochemical method and net analyte signal interferent modeling

摘要

Antinonin and trifluralin are selective herbicides to control the insects and usually used with each other. Simultaneous determination of antinonin and trifluralin has been investigated, using modified carbon paste electrode (CPE) prepared from: graphite, multi-walled carbon nanotubes (MWCNT) and nanomagnetic core-shell (Fe3O4/SiO2). Cyclic voltammetry (CV) and square wave voltammetry (SWV) studies indicated two-oxidation peak for antinonin and one oxidation peak for trifluralin from 0 to + 0.6 V. For simultaneous determination of antinonin and trifluralin severe overlap of the voltammogram profiles was observed. It was shown that the electrochemical profile of the analytes changes in the presence of each other. Therefore, results of the analysis of antinonin and trifluralin by H-point standard addition method in their mixtures in water samples were not satisfactory. In order to determine antinonin and trifluralin simultaneously, net analyte signal interferent modeling (NAS-IM) was used. The proposed sensor was found that is able to determine antinonin and trifluralin with a detection limit of 0.3 and 3 nM, respectively. The method was successfully applied for the assay of antinonin and trifluralin simultaneously in water samples.