Fast Screening for Chlorinated Pesticides, Using Solid Phase Microextraction (SPME) and Capillary GC

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Courtesy of Sigma-Aldrich Co., LLC

Fast analysis of environmental samples increases throughput in the lab and is highly desirable for quick turnaround screening methods used in the field or prior to GC/MS analysis. Solid phase microextraction is a fast, solventless alternative to conventional sample extraction techniques. In SPME, analytes establish an equilibrium between the sample matrix and a stationary phase coated on a fused silica fiber, then are thermally desorbed from the fiber to the column. Because no solvent is injected, and the analytes are rapidly desorbed onto the column, short, narrow bore columns can be used. This greatly reduces analysis time and improves minimum detection limits, while maintaining resolution. SPME can be effective in screening samples for chlorinated pesticides, or as an alternative extraction method in a formal analysis.

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