Gas chromatography exact mass time-of-flight mass spectrometryquantification and screening of pestic

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  A gas chromatography exact mass time-of-flight mass spectrometry (GC-TOF-MS) based method has been developed for the quantification of approximately one hundred pesticides in baby food, pear and lettuce samples.Prior to analysis, co-extractives were removed from acetonitrile: toluene (80∶20) extracts using dispersive solid-phase extraction with primary secondary amine (50 mg) and carbon sorbent (50 mg).The concentration of pesticides in the extracts was measured using an extracted mass chromatogram window of 0.05 Da.Extracts spiked with pesticides at 0.10 and 0.01 mg kg1 yielded average recoveries in the range of 70-109% with relative standard deviations less than 26% for the majority of the analytes, with good linearity.
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