title: Dynamic microwave-assisted extraction.
abstract: An apparatus for extraction of solid matrices has been constructed which utilizes a microwave technique for heating in a dynamic mode. During the extraction, fresh solvent is continuously pumped through the extraction cell, which is maintained at a slight overpressure in order to keep the solvent in a liquid state. The extraction efficiency, which can be easily monitored, has been investigated in a factorial design and validated for polycyclic aromatic hydrocarbons in a reference sediment sample (EC-1). Important parameters were found to be temperature and duration of extraction. Flow-rate had no significant first-order effect on the recovery, but interaction effects with flow-rate were found to be significant. The dynamic microwave-assisted extraction apparatus was demonstrated to yield recoveries equivalent to Soxhlet extraction, but in a much shorter time. Each extraction of EC-1 typically takes 40 min.
authors.affiliation: Department of Analytical Chemistry, Stockholm University, Sweden.
authors.forename: M
authors.initials: M
authors.lastname: Ericsson
authors.forename: A
authors.initials: A
authors.lastname: Colmsjö
mesh_terms: D002851:Chromatography, High Pressure Liquid; D008872:Microwaves; D013050:Spectrometry, Fluorescence