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A novel liquid-liquid microextraction method, that we have termed continuous-flow microextraction (CFME), is described. In a 0.5-mL glass chamber, an organic drop (1-5 microL) is held at the outlet tip of a polyetheretherketone (PEEK) connecting tubing which is immersed in a continuously flowing sample solution and acts as the fluid delivery duct and as a solvent holder. Extraction takes place between the organic drop and the flowing sample solution that is continuously ejected out of the PEEK tubing. Concentration factors of between 260- to 1600-fold are achieved within 10 min of extraction. Aspects relevant to CFME were studied. In combination with gas chromatography-electron capture detection, CFME allows analytes to be detected at femtogram-per-milliliter levels. The performance of this technique was evaluated on the basis of the analysis of trace nitroaromatic compounds and chlorobenzenes in environmental samples.
Liu et al. (Thu,) studied this question.