Geosmin (1,2,7,7-tetramethyl-2-norborneol) and 2-MIB (2-methylisoborneol), compounds produced by blue-green algae, cause musty unpleasant odors in public water supply reservoirs. While these compounds are not known to be a health concern, it is common practice to remove the odor and monitor Geosmin and 2-MIB.
Entech has created an improved version of SPME, called VASE. VASE uses Vacuum Assisted Sorbent Extraction. The cartridge can be coated with absorbents such as PDMS and has a 1/8” hollow interior that holds up to 100mg of Tenax TA or other adsorbents. VASE has a flow through design that allows the creation of a vacuum after the cartridge is inserted into the sample headspace to vastly increase the diffusion rate from the liquid/headspace boundary to the cartridge.
Vacuum extractions can occur 4-8 times faster, especially for heavier aromas or off-odors such as Geosmin and 2-Methylisoborneol (lake water smell) in drinking water with accurate quantitation down to as low as 1-2 part-per-trillion.
Several VASE cartridges can sample simultaneously for improved sensitivity when performing low part-per-trillion level headspace analysis.
Learn More About VASE
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