Dynamic extraction in rotating coiled columns, a new approach to direct recovery of polycyclic aromatic hydrocarbons from soils

被引:19
作者
Fedotov, PS
Bauer, C
Popp, P
Wennrich, R
机构
[1] UFZ Helmholtz Ctr Environm Res, Environm Res Ctr, Dept Analyt Chem, D-04318 Leipzig, Germany
[2] Russian Acad Sci, VI Vernadskii Inst Geochem & Analyt Chem, Moscow 119991, Russia
关键词
rotating coiled columns; soil; environmental analysis; extraction analysis; extraction methods; countercurrent chromatography; polynuclear aromatic hydrocarbons;
D O I
10.1016/j.chroma.2003.10.022
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
A new approach to the direct recovery of polycyclic aromatic hydrocarbons (PAHs) from environmental solid samples has been proposed. It has been shown that rotating coiled columns (RCCs) earlier used mainly in countercurrent chromatography can be successfully applied to the fast continuous-flow extraction of PAHs from soils. A particulate solid sample was retained in the rotating column as the stationary phase under the action of centrifugal forces while a mixture of organic solvents (acetone-cyclohexane, 1:1, v/v) was continuously pumped through. The separation procedure requires less than half an hour, complete automation being possible. No clean-up step is needed before the subsequent HPLC- analysis of extracts. Besides, the dynamic multistage extraction performed in the rotating column at room temperature and normal pressure may have nearly the same efficiency as accelerated batch solvent extraction repeated three times at 150degreesC and 14 MPa. Contents of PAHs in extracts obtained by using both methods are in good agreement with the certified data on the PAHs concentrations in the soil samples. The use of appropriate "mild" solvents for the dynamic extraction in rotating columns may be very perspective for the simulation of naturally occurring processes and determination of environmentally-relevant forms of PAHs and other pollutants in environmental solids. A particular emphasis could be placed on time-resolved (kinetic) studies of the mobilization of toxicants in soil systems. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:305 / 309
页数:5
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