Browse >100,000 products at ColeParmer.com ■ Easily concentrate analytes, e.g. trace organic pollutants in environmental samples ■ Flanged polypropylene cartridges contain highest quality silica media ■ Low levels of fines and acid washing reduce or eliminate the need to precondition Cole-Parmer SPE beds Cole-Parmer® Air Admiral® Vacuum/Pressure Pump - Compact size and integral handle make pump easily transportable - Low-friction piston runs cool and quiet for a long service life with consistent performance C€ ® Free-air capacity cfm (L/min) Note: Do not pump liquids or immerse pump. Avoid organic, basic, and acidic vapors. About solid-phase extraction Solid-phase extraction or ”SPE” is a form of “digital chromatography”, an all-or-nothing approach to purifying a sample. Unlike regular liquid chromatography, where the elution of peaks or components occurs gradually, molecules adhere to SPE completely and then are totally released from the SPE media in a separate step. Total adsorption of an analyte to a sorbent enables impurities to be rinsed away from the supported material using an appropriate solvent. For this step, the solvent has substantially less affinity for the analyte than does the SPE support material. A final elution is then used to release the now-purified analyte away from the support. In this step, the solvent used has a strong affinity for the analyte. The process is shown visually at right. 1. Condition 2. Apply sample 3. Interference 4. Analyte sorbent and analyte elution elution