Solid-phase microextraction (SPME) for determination of geosmin and 2-methylisoborneol in volatile emissions from soil disturbance

A method is described here for the concentration and determination of geosmin 2-methylisoborneol (2-MIB) from gaseous phase, with translation to field collection quantification soil disturbances in situ. The based on use solid-phase microextraction (SPME) fibers adsorption volatile chemicals vapor followed by desorption into a gas chromatograph-mass spectrometer (GC-MS) analysis. SPME fiber allows simple introduction GC-MS without further sample preparation. Several sorbent types were studied 50/30 μm DVB/CAR/PDMS was best performer maximize detected peak areas both analytes combined. Factors such as extraction temperature time along explored respect analyte recovery. An 30 °C 10 min, 230 4 min simultaneous analysis 2-MIB complete loss either one. developed used successfully measure emission just above disturbed undisturbed soils, indicating that this detects compounds readily atmospheric samples. Both present background concentrations open air, while soils emitted much higher compounds. Surprisingly, always at than geosmin, focus its detection may be more useful monitoring sensitive low levels disturbance.