Solid phase microextraction (SPME) in conjunction with gas chromatography-mass spectrometry (GC-MS) is a simple and effective way to sample analytes. Typically during desorption in the GC the coated fiber is automatically rid of most compounds, allowing for the analysis of a new sample. This study indicates that simple desorption is not enough to thoroughly clean a Carboxen PDMS 75�m  fiber from dihalomethanes, resulting in carryover of the analyte between samples. Our data suggests that heating the fiber in a separate injection port between each run prevents carryover from sample to sample. Calibration curves indicate that heating between samples significantly improves the linearity of the peak area vs. concentration relationship.

Improved methodology for removing dihalomethane carryover from SPME fibers

244th National Meeting (2012)

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