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Solid phase extraction (SPE) is the most powerful technique currently available for rapid, selective sample preparation. The versatility of SPE allows it to be used for a number of purposes, such as purification, fractionation, trace enrichment, solvent exchange, desalting, and derivatization. 

Automatic Sample Preparation System of solid phase extraction for residual pesticide  and environmental analysis for HPLC ,CAS,LC/MS/MS