ONLINE COUPLING OF A GAS-CHROMATOGRAPH TO A CONTINUOUS LIQUID LIQUID EXTRACTOR

A new analytical methodology for sample preparation and analysis combining on-line extraction and gas chromatography is reported. The extraction unit used is connected to the Instrument via an injection valve that permits the Introduction of 4 μL of vaporized sample directly Into the Instrument Injection port. The proposed methodology can be Implemented In two operational modes allowing quantitative extraction and the simultaneous extraction-derivatization of phenol compounds. The esters of phenols, cresols, and chlorophenols were formed by continuous extraction Into acetic anhidride In n-hexane, which allowed between 0.2 and 300 μg/mL of different phenols to be detected with relative standard deviations In the range 0.8-3.5%. © 1990, American Chemical Society. All rights reserved.