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Determination of methylviologen (Paraquat) by differential pulse polarography

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Determination of Methylviologen (Paraquat) by Differential Pulse Polarography

The second reduction wave of methylviologen (“Paraquat”) has been studied at pH 2 by different polarographic techniques. The limiting current is diffusion-controlled. Evidence for dimerization of the radical formed in the first reduction step has been obtained. Theα n values for the reduction process have been calculated at concentration levels where the dimer and the monomer predominate. Paraquat can be determined by differential pulse polarography in the 6.0×10−5−4.0×10−7 M concentration range, the limit of determination being 1.7×10−7 M. The method has been applied to paraquat determination in commercial herbicides.

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Authors and Affiliations

  1. Department of Analytical Chemistry, Faculty of Chemistry, Complutense University of Madrid, Madrid, Spain

    P. Yáñez-Sedeño, J. M. Pingarrón & L. M. Polo Díez

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  1. P. Yáñez-Sedeño
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  2. J. M. Pingarrón
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  3. L. M. Polo Díez
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Yáñez-Sedeño, P., Pingarrón, J.M. & Polo Díez, L.M. Determination of methylviologen (Paraquat) by differential pulse polarography. Mikrochim Acta 87, 279–287 (1985). https://doi.org/10.1007/BF01197007

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  • DOI: https://doi.org/10.1007/BF01197007

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