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United States Department of Agriculture

Agricultural Research Service

Title: Modern Laboratory Procedures for Measuring Organic Crop Protection Chemicals

Authors
item Koskinen, William
item Duffy, Michael - DUPONT AGRI PRODUCTS

Submitted to: Soil Science Society of America Special Publication Book Chapter
Publication Type: Book / Chapter
Publication Acceptance Date: June 15, 2000
Publication Date: N/A

Technical Abstract: The determination of organic crop protection chemicals in environmental samples presents challenging analytical problems. For instance, some of the newer classes of pesticides must be analyzed at trace levels; they can affect plant growth at concentrations of 0.1 ppb. Confirmation of these chemicals at trace levels is difficult. Analyses of these chemicals in soil land water also can seldom be performed directly because of the trace level of the chemical in the matrix compared to the amount of interfering substances. Some chemicals present challenges because they are polar and thermally labile. Analysis is a multi-step process involving extraction, sample preparation, and quantification. In this chapter, advantages and disadvantages of the some of the newer extraction techniques (i.e. solid- phase extraction, supercritical fluid extraction, and accelerated solvent extraction) and methods of separation (i.e. supercritical fluid chromatography and capillary chromatography) are discussed. Selectivity an sensitivity of various means of analyte detection (i.e. electron capture, flame photometric, and mass spectorscopy detection) are also discussed.

Last Modified: 9/23/2014