|Duffy, M - DUPONT AGRIC PRODUCTS|
Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: October 27, 1997
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. Analyses of these chemicals in soil and 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. Other chemicals present challenges because they are polar and thermally labile. Analysis is a multi-step process involving extraction, sample preparation, confirmation, and quantification. In this paper, advantages and disadvantages of the some of the newer extraction techniques (i.e. SPE, SFE, and ASE) and methods of separation (i.e. GC, HPLC, SFC, CE) will be discussed. Selectivity and sensitivity of various means of analyte detection (i.e. ECD, FPD, MS, EIA) will be discussed.