Add time:07/26/2019         Source:sciencedirect.com

The photodegradation of the neonicotinoid insecticide Nitenpyram (cas 120738-89-8) (NPY) under UV and solar irradiation has been investigated in water solutions in order to assess its persistence in the environment and its transformation into other potentially more toxic species. Time-courses were followed by ultra-high performance liquid chromatography-tandem mass spectrometry. Transformation products (TPs) were identified by their accurate product ion spectra, obtained with a quadrupole time-of-flight mass spectrometer after their liquid chromatographic separation. NPY was rapidly photodegraded under all the investigated conditions, following a first-order model and with half-lives varying from seconds to <10 min. Quantum yields were between 0.0385 and 0.0534 mol einstein−1. The identified TPs, some of them reported for the first time in this study, were formed through different reactions involving the nitro-ethylene moiety of the parent insecticide. Conversely to the lability of NPY, its TPs were more photo-stable in both ultrapure and river water. Moreover, in-silico toxicity assessment showed that most of them display a higher acute toxicity than NPY.

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