Journal
JOURNAL OF SEPARATION SCIENCE
Volume 39, Issue 9, Pages 1757-1765Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.201501401
Keywords
Multi-Plug Filtration Cleanup; Multiwalled carbon nanotubes; Pesticide residue analysis; Spinach
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Funding
- Beijing Municipal Science & Technology Commission [Z151100001215015]
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Spinach is one of the most commonly planted vegetables worldwide. A high chlorophyll content makes spinach a complicated matrix in pesticide residue analysis. In this study, a rapid clean-up method was developed for the analysis of pesticide multi-residues in spinach followed by liquid chromatography with tandem mass spectrometry. A modified QuECh-ERS method with multiwalled carbon nanotubes and carbon material was adopted in the multi-Plug Filtration Cleanup procedure. This method was validated for 44 representative pesticides spiked at two concentration levels of 10 and 100 mu g/kg. The pesticides of different physicochemical properties were registered on spinach in China. The recoveries were between 76 and 114% for major pesticides with relative standard deviations of less than 15%, except for quizalofop-P-ethyl, pyrimethanil, and carbendazim. Matrix-matched calibration curves were performed with the coefficients of determination higher than 0.995 for the studied pesticides for concentration levels of 10-500 mu g/kg. The limits of quantitation ranged from 2 to 10 mu g/kg. The developed method was successfully applied to determine pesticide residues in Chinese market spinach samples.
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