Effect of solvent on extraction of polychlorinated biphenyls and polychlorinated dibenzodioxins from charcoal

Citation
Js. Yang et al., Effect of solvent on extraction of polychlorinated biphenyls and polychlorinated dibenzodioxins from charcoal, J LIQ CHR R, 24(15), 2001, pp. 2293-2302
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemistry & Analysis","Spectroscopy /Instrumentation/Analytical Sciences
Journal title
JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES
ISSN journal
1082-6076 → ACNP
Volume
24
Issue
15
Year of publication
2001
Pages
2293 - 2302
Database
ISI
SICI code
1082-6076(2001)24:15<2293:EOSOEO>2.0.ZU;2-W
Abstract
The effect of solvent on the extraction of two polychlorinated biphenyls (P CBs) and five polychlorinated dibenzodioxins (PCDDs) from charcoal is inves tigated and the variations in recoveries of these analytes are explained. T he extraction is performed using chromatographic elution, ultrasound-assist ed extraction (UAE) of probe- and bath-type, supercritical fluid extraction (SFE), and enhanced-fluidity liquid extraction (EFLE). In each of the extr action methods used, only the use of isopropanol-toluene mixtures shows hig her recoveries than the use of toluene alone. Higher recoveries are obtained using EFLE, compared with other extraction m ethods, even though the same amount, i.e., 30mL, of extraction solvent is u sed, because higher temperature is applied under higher pressure. After eac h extraction, chromatographic interferences are removed through a multilaye r silica gel column clean-up. The quantification of PCBs and PCDDs is perfo rmed using HPLC-UV.