Differential pulse voltammetric determination of fenobucarb at the glassy carbon electrode, after its alkaline hydrolysis to a phenolic product

A differential pulse voltammetric method for the determination of fenobucarb is proposed. This N ‐methylcarbamate pesticide is hydrolyzed in alkaline medium (0.02 M NaOH during ten min), and the resulting product 2‐ sec ‐butylphenol is oxidized at the glassy carbon electrode giving rise to a peak at a potential near 750 mV (pH 3.5). The linear relationship between I p and fenobucarb concentration was established up to 1.00 × 10 −4 M concentration, the detection limit was 3.68 × 10 −6 M. The RSD is 3.74% for a 1.0 × 10 −5 M concentration ( n = 11, p = 0.05). The method has been satisfactorily applied to the analysis of water samples spiked with the pesticide.