High Resolution Image Download MS PowerPoint Slide A method based on in-syringe dispersive solid phase extraction (IS-D-SPE) and ultra performance liquid chromatography Orbitrap high resolution mass spectrometry for the multiresidue analysis of 117 pesticides in tea was developed. Full scan mode was acquired over an m / z range of 100–800 with Orbitrap resolution at 70000, followed by full scan/dd-MS 2 mode for confirmation. The identification criteria of retention time and mass accuracy tolerance was ±0.20 min and ±5.0 ppm, respectively. MS/MS fragment ions obtained dd-MS 2 were necessary to identify the pesticides with the same molecular mass weight. The IS-D-SPE technique involved a mixture of 200 mg PSA, 100 mg C18, and 15 mg multiwalled carbon nanotubes for the cleanup of tea matrix. Good linearity ( R 2 > 0.99) for 117 pesticides was obtained. Satisfactory recoveries in the range of 70–120% were obtained for 105 pesticides, while intraday and interday precisions were below 20%. Limits of quantification were generally 10 μg kg –1 . Finally, this method was employed to analyze 117 pesticides in 70 tea samples.
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Chen et al. (2017) studied this question.
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