Solvent Bar Microextraction

• Published in: Analytical chemistry (Washington) Vol. 76; no. 18; pp. 5591 - 5596
• Main Authors: Jiang, Xianmin, Lee, Hian Kee
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 15.09.2004
• Subjects: Analytical chemistry; Chemistry; Chromatographic methods and physical methods associated with chromatography; Exact sciences and technology; Gas chromatographic methods; Hollow fiber membranes; Slurry reactors; Performance evaluation; Octanol; Solvent extraction; Polychlorobiphenyl; Chemical enrichment; Solid phase microextraction; Gas chromatography; Soils; Organic solvent; Sample preparation; Reproducibility; Model compound; Hollow fiber; Membrane; Aqueous solution; Comparative study
• ISSN: 0003-2700; 1520-6882
• DOI: 10.1021/ac040069f

In this work, a new and simple microextraction method termed solvent bar microextraction (SBME) was developed. In this method, the organic extractant solvent (1-octanol) was confined within a short length of a hollow fiber membrane (sealed at both ends) that was placed in a stirred aqueous sample solution. Tumbling of the extraction device within the sample solution facilitated extraction. Pentachlorobenzene (PCB) and hexachlorobenzene (HCB) were used as model compounds to investigate the extraction performance. Analysis was carried out by gas chromatography/electron capture detection. This new method provided very high enrichment (∼110-fold for PCB and ∼70-fold for HCB) in 10 min and good reproducibility (<4%, n = 6). Since the hollow fiber membrane was sealed, it could be used for extraction from “dirty” samples, such soil slurries. This novel microextraction method was compared with single-drop microextraction and static hollow fiber membrane microextraction in which the extractant solvent was also held within a hollow fiber but with the latter fixed to a syringe needle (i.e., there was no tumbling effect). Comparison between SBME and conventional solid-phase microextraction in a soil slurry sample was also investigated.