Liquid chromatography–tandem mass spectrometric methods for the determination of spinosad, thiacloprid and pyridalyl in spring onions and estimation of their pre-harvest interval values
Food Chemistry(2016)
Abstract
•LC–MS/MS methods for the determination of spinosad, thiacloprid & pyridalyl in spring onions are presented.•A multi-residue method and a specific one for pyridalyl were developed and validated.•Thorough optimisation of analytical parameters (mobile phase, ionisation) was performed.•Degradation rates, PHIs and half-life values of the pesticides were calculated.•A pre-harvest interval of 10days was achieved for thiacloprid, 39.4days for pyridalyl and 0days for spinosad.
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Key words
Pesticides,Spring onions,Multi-residue,LC–MS/MS,Pre harvest interval,Degradation rate,Half-life
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