Resumo

MARTINEZ, Edwin R.; DOTOR, Mónica Y.  e  CHAPARRO, Sandra P.. VALIDATION OF A VOLTAMMETRIC METHOD FOR THE ESTIMATION OF MANCOZEB IN BULB ONION (Allium cepa L.). rev.udcaactual.divulg.cient. [online]. 2014, vol.17, n.2, pp.607-611. ISSN 0123-4226.

A sensitive method for quantification of mancozeb in bulb onion was validated. The study was conducted using as supporting electrolyte Britton-Robinson buffer solution. Ag / AgCl electrode was used as reference electrode while the working electrodes were glassy carbon and platinum electrodes. Mancozeb fungicide presented two reduction peaks, in â^’860 mV and â^’1100 mV, with profile of the redox process totally reversible; the use of pulses allowed a detection of ppb levels after the optimization of experimental and voltammetric conditions. Sample preparation included solid liquid extraction with dichloromethane. The detection limit was 15.1ppb and the limit of quantification was 76.5ppb. The results obtained were compared by UV-Vis spectroscopy allows to deduce that the voltammetric method generates accurate and reliable quantification of mancozeb in bulb onion.

Palavras-chave : Uncertainty; limit of detection; agricultural products; fungicide.

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