A liquid chromatographic (LC) method that uses a water rich mobile phase to isolate imidacloprid and its photolysis products, a photodiode array (PDA), and electro-spray mass spectrometer (MS) to detect them was employed to characterize mixtures of imidacloprid and its degradation products. The photolysis study that was undertaken showed that decomposition of imidacloprid in distilled water is a first order reaction, and the major photolysis products are imidacloprid urea, imidacloprid olefin, and imidacloprid desnitro.
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Lavine et al. (2010) studied this question.
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