固相萃取仪指南

Solid phase extraction (SPE) is an increasingly useful sample preparation technique. With SPE, many of the problems associated with liquid/liquid extraction can be prevented, such as incomplete phase separations, less-than-quantitative recoveries, use of expe nsive, breakable specialty glassware, and disposal of large quantities of organic solvents. SPE is more efficient than liquid/liquid extraction, yields quantitative extractions that are easy to perform, is rapid, and can be automated. Solvent use and lab time are reduced. SPE is used most often to prepare liquid samples and extract semivolatile or nonvolatile analytes, but also can be used with so lids that are pre-extracted into solvents. SPE products are excellent for sample extraction, concentration, and cleanup. They are av ailable in a wide variety of chemistries, adsorbents, and sizes. Selecting the most suitable product for each application and sample is important.