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An Improved Method for Multiresidue Analysis of Pesticides in Lettuce, Chinese Cabbage and Green Pepper by Gas Chromatography

  • Hong, Yong-Soon (School of Agricultural Biotechnology, Seoul National University) ;
  • Park, Hee-Won (School of Agricultural Biotechnology, Seoul National University) ;
  • Choi, Hoon (School of Agricultural Biotechnology, Seoul National University) ;
  • Moon, Joon-Kwan (School of Agricultural Biotechnology, Seoul National University) ;
  • Kim, Min-Jeong (Department of Agricultural Chemistry, Kyungpook National University) ;
  • Kim, Jang-Eok (Department of Agricultural Chemistry, Kyungpook National University) ;
  • Lee, Young-Deuk (Division of Life and Environmental Science, Daegu University) ;
  • Oh, Chang-Hwan (Department of Agricultural Chemistry, Kyungpook National University) ;
  • Kim, Jeong-Han (School of Agricultural Biotechnology, Seoul National University)
  • Published : 2004.09.30

Abstract

For the improvement of gas chromatographic analysis of multiple pesticide residues in green pepper, lettuce and Chinese cabbage, multiresidue test mixtures (MRTMs) of 10 groups (ECD 5 groups and NPD 5 groups) and a recovery test mixture (RTM) of 18 compounds (11 compounds for ECD and 7 compounds for NPD) were established based on retention time and response to relevant detectors. A new extraction solvent (acetone: acetonitrile=1 : 9) and a clean up eluent (hexane: dichloromethane : acetonitile = 50 : 48.5 : 1.5) for solid-phase extraction (SPE) cartridge were selected to test two types of multiresidue methods (MRM I and MRM II). MRM II provided high recovery better than MRM I when RTM was tested Recovery experiment with MRTMs which was conducted using MRM II resulted in that more than seventy percents of compounds were recovered in the range of $50{\sim}140%$, while 9% of compounds were over 140% of recovery and only $7{\sim}8$ compounds failed to detect. MRM II, an improved method, could be employed for screening residues of 190 pesticides in those vegetables.

Keywords

References

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