title: Vortex-assisted liquid-liquid microextraction for the rapid screening of short-chain chlorinated paraffins in water.
abstract: The rapid screening of trace levels of short-chain chlorinated paraffins in various aqueous samples was performed by a simple and reliable procedure based on vortex-assisted liquid-liquid microextraction combined with gas chromatography and electron capture negative ionization mass spectrometry. The optimal vortex-assisted liquid-liquid microextraction conditions for 20 mL water sample were as follows: extractant 400 μL of dichloromethane; vortex extraction time of 1 min at 2500 × g; centrifugation of 3 min at 5000 × g; and no ionic strength adjustment. Under the optimum conditions, the limit of quantitation was 0.05 μg/L. Precision, as indicated by relative standard deviations, was less than 9% for both intra- and inter-day analysis. Accuracy, expressed as the mean extraction recovery, was above 91%. The vortex-assisted liquid-liquid microextraction with gas chromatography and electron capture negative ionization mass spectrometry method was successfully applied to quantitatively extract short-chain chlorinated paraffins from samples of river water and the effluent of a wastewater treatment plant, and the concentrations ranged from 0.8 to 1.6 μg/L.
authors.affiliation: Department of Chemistry, National Central University, Chung-Li 320, Taiwan.
authors.forename: Chia-Yu
authors.initials: CY
authors.lastname: Chang
authors.affiliation: Department of Chemistry, National Central University, Chung-Li 320, Taiwan.
authors.forename: Wu-Hsun
authors.initials: WH
authors.lastname: Chung
authors.affiliation: Department of Chemistry, National Central University, Chung-Li 320, Taiwan.
authors.forename: Wang-Hsien
authors.initials: WH
authors.lastname: Ding
keywords: Chlorinated paraffins; Gas chromatography with mass spectrometry; Liquid-liquid microextraction; Water analysis