Analytical methods using ultra performance liquid chromatography tandem mass spectrometry (UPLC-MSMS) and gas chromatography tandem mass spectrometry (GC-MS/MS) were developed for the determination of over 400 pesticides and pesticide degradates in various matrices including crops, bees, and water.  With the combination of UPLC-MS/MS and GC-MS/MS, compounds with very different properties could be analyzed.  For agricultural crops, a QuEChERS method of sample processing procedure was used.  For water samples, direction injection was used.  Modification of the sample preparation also enabled the analysis of these compounds in bees and bee hive contents.  Generally two mass transitions were used for all analyses.  Only one transition was available for a few compounds.   The recoveries for most of the analytes were from 60% to 120%.  Method detection limits (MDLs) for most analytes were from 1-5 ng/g for solid matrices and 10-50 ng/L for water.  However, MDLs for a few compounds were much higher.

Screening for pesticides and their degradates in water and agricultural commodities using UPLC-MS/MS and GC-MS/MS

248th National Meeting (2014)

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