Fast and direct determination of mancozeb through batch injection analysis with amperometric detection on boron-doped diamond electrodes

• A simple, fast and sensitive method for the determination of mancozeb is proposed.
• The limit of detection was 5.14 × 10−7 mol L−1.
• The determination of mancozeb exhibited relative error values lower than 2%.

This work describes the determination of mancozeb in insecticide samples using batch injection analysis (BIA) with pulsed amperometric detection (PAD) on boron-doped diamond (BDD) electrodes. The BIA amperometric parameters were evaluated and the best responses were achieved in phosphate solution at pH 9.0, using a detection potential of 0.3 V, cleaning potential of 0.0 V, dispensing rate of 160 μL s−1 and injection volume of 100 μL. A linear analytical curve was observed in the 40–650 μmol L−1 range, with a detection limit of 5.14 × 10−7 mol L−1. The determination of mancozeb in the insecticide samples proved to be in agreement with the standard iodometric titration (CIPAC method), with a 95% confidence level and with a relative error lower than 2%. In this way, the BIA–PAD method presented a fast response, high sensitivity, good repeatability and good reproducibility.

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