Square wave voltammetric determination of methiocarb insecticide based on multiwall carbon nanotube paste electrode

• Mediante una voltamperometría de onda cuadrada con electrodo de pasta de carbono de estructura de nanotubos se ha estudiado la determinación del insecticida metiocarb en suelos y ríos.

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• Cyclic voltammogram of methiocarb in 0.1 M H₂SO₄ exhibited an irreversible anodic peak at about +1285 mV vs. Ag/AgCl.  Electrooxidn. and detn. of methiocarb in spiked soil, river water, and agrochem. formulation were realized on a newly prepd. carbon-nanotube paste electrode by applying square wave voltammetry (SWV).  The dE _p/dpH value indicated that the oxidn. mechanism involved the coupling of H⁺ with the oxidn. process.  The peak signals were linearly related to methiocarb concn. in the range of 1.5-59.1 mg L^-1 with a detection limit of 0.45 mg L^-1.  The accuracy and selectivity of the proposed method were shown by calcg. the recoveries of methiocarb from soil, river water, and pesticide formulation Mesurol.  The calcd. percent recoveries for soil and river water samples spiked with 30.0 μg g^-1 and 40.0 μg mL^-1 levels were 99.3 ±1.2 and 98.5 ±0.3 at 95% confidence limit, resp.
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• Inam, Recai; Bilgin, Cansu
• Journal of Applied Electrochemistry (2013), 43(4), 425-432