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Abstract
A glassy carbon electrode was functionalized by MoO2 nanoparticle-decorated multiwalled carbon nanotubes (MWCNTs) and examined as a working electrode in oxyfluorfen (OXY) detection by differential pulse stripping voltammetry (DPSV). Measurement parameters were as follows: initial potential - 0.1V, end potential + 0.5V, accumulation potential - 0.15V, accumulation time 80s, and scan rate 50mVs-1. A stripping potential of + 0.315V vs. Ag/AgCl was employed. The pPesticide oxyfluorfen was determined in model samples by DPSV with good reproducibility (RSD <2.4%)in the concentration range 2.5 to 34.5ngmL-1, with r = 0.99 and alimit of detection of 1.5ngmL-1. These results are in the same range as those of HPLC/DAD, which is used as the comparative method. Recovery for OXY determination in areal river watersample was 102%. Analyses in Briton-Robinson buffer has shown to be pH dependent with the best response at pH6.0. Structural characterization of MoO2-MWCNT by Raman spectroscopy, field emission scanning electron microscopy, high-resolution transmission electron microscopy, and X-ray crystallography revealed apreserved MWCNT structure decorated with firmly attached clusters of MoO2 nanoparticles. Graphical abstract Glassy carbon electrode functionalized by MoO2 nanoparticle-decorated multiwalled carbon nanotubes is used as a working electrode in the voltammetric determination of pesticide oxyfluorfen in water.
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