Environmental Chemistry Letters

, Volume 16, Issue 2, pp 581–590 | Cite as

Photodegradation of the pure and formulated alpha-cypermethrin insecticide gives different products

  • Fabio Gosetti
  • Bianca Bolfi
  • Ugo Chiuminatto
  • Marcello Manfredi
  • Elisa Robotti
  • Emilio Marengo
Original Paper


Alpha-cypermethrin is a broad-spectrum insecticide widely used in the treatment of rice crops, mainly commercialized as a CONTEST® formulation. The photodegradation of alpha-cypermethrin and of the commercial formulation has not yet been systematically investigated in paddy water under natural conditions. Here, paddy water solutions of alpha-cypermethrin and CONTEST® formulation at 5.0 mg L−1 were irradiated under simulated sunlight for 10 days. Hydrolysis experiments were carried out on the same solutions preserved in the dark. Analysis by ultra-high-performance liquid chromatography–tandem mass spectrometry was developed for the identification of photodegradation products. Results show that degradation of pure alpha-cypermethrin and the formulation counterpart produces both common and different photodegradation products. Five out eleven photodegradation products were identified for the first time, in particular three in the alpha-cypermethrin paddy water solution and four in the formulation. Our findings underline the importance of carrying out photodegradation experiments directly on the commercial formulation, since degradation products could be different from the pure insecticide.


Alpha-cypermethrin CONTEST Photodegradation Degradation products Paddy water UHPLC–MS 


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Copyright information

© Springer International Publishing AG, part of Springer Nature 2017

Authors and Affiliations

  1. 1.Department of Science and Technological InnovationUniversity of Piemonte OrientaleAlessandriaItaly
  2. 2.SciexBrugherioItaly
  3. 3.ISALIT S.r.l.NovaraItaly

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