Results 181 to 190 of about 60,478 (213)
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Journal of Separation Science, 2010
AbstractGas‐diffusion microextraction (GDME) is an innovative technique that combines the advantages of membrane‐aided gas‐diffusion with microextraction concepts. GDME makes uses of a novel portable and low‐cost device that comprises a small, commercially available, semi‐permeable membrane.
Joao Grosso Pacheco +4 more
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AbstractGas‐diffusion microextraction (GDME) is an innovative technique that combines the advantages of membrane‐aided gas‐diffusion with microextraction concepts. GDME makes uses of a novel portable and low‐cost device that comprises a small, commercially available, semi‐permeable membrane.
Joao Grosso Pacheco +4 more
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Journal of Chromatography A, 2000
This review will attempt to provide an overview as well as a theoretical and practical understanding of the use of microextraction technologies for drug analysis. The majority of the published reports to date focus on the use of fibre solid-phase microextraction and so the review is significantly focused on this technology.
H, Lord, J, Pawliszyn
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This review will attempt to provide an overview as well as a theoretical and practical understanding of the use of microextraction technologies for drug analysis. The majority of the published reports to date focus on the use of fibre solid-phase microextraction and so the review is significantly focused on this technology.
H, Lord, J, Pawliszyn
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Headspace Solvent Microextraction
Analytical Chemistry, 2001A hanging microliter drop of 1-octanol is shown to be an excellent preconcentration medium for headspace analysis of volatile compounds in an aqueous matrix by gas chromatography (GC) or gas chromatography/mass spectrometry (GC/MS). Model compounds benzene, toluene, ethylbenzene, and o-xylene (BTEX) are conveniently and rapidly preconcentrated in the ...
A L, Theis +3 more
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Analytical Chemistry, 2003
The properties of a thin sheet of poly(dimethylsiloxane) (PDMS) membrane as an extraction phase were examined and compared to solid-phase microextraction (SPME) PDMS-coated fiber for application to semivolatile analytes in direct and headspace modes.
Inge, Bruheim +2 more
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The properties of a thin sheet of poly(dimethylsiloxane) (PDMS) membrane as an extraction phase were examined and compared to solid-phase microextraction (SPME) PDMS-coated fiber for application to semivolatile analytes in direct and headspace modes.
Inge, Bruheim +2 more
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Analytical Chemistry, 2004
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.
Jiang, X., Lee, H.K.
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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.
Jiang, X., Lee, H.K.
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Dispersive suspended microextraction
Analytica Chimica Acta, 2011A novel sample pre-treatment technique termed dispersive suspended microextraction (DSME) coupled with gas chromatography-flame photometric detection (GC-FPD) has been developed for the determination of eight organophosphorus pesticides (ethoprophos, malathion, chlorpyrifos, isocarbophos, methidathion, fenamiphos, profenofos, triazophos) in aqueous ...
Zhong-Hua, Yang +5 more
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Analytica Chimica Acta, 2019
For the first time, a rapid, efficient, simple, and inexpensive approach for solid phase microextraction on a screw (MES) was developed. MES is a miniaturized form of solid-phase extraction without any backpressure. In this system, analytes were adsorbed on the surface of micro channels of a screw that was coated by polypyrrole (PPy).
Mahmoud Tabibpour +2 more
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For the first time, a rapid, efficient, simple, and inexpensive approach for solid phase microextraction on a screw (MES) was developed. MES is a miniaturized form of solid-phase extraction without any backpressure. In this system, analytes were adsorbed on the surface of micro channels of a screw that was coated by polypyrrole (PPy).
Mahmoud Tabibpour +2 more
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Multiple solid-phase microextraction
Journal of Chromatography A, 2000Theoretical aspects of multiple solid-phase microextraction are described and the principle is illustrated with the extraction of lidocaine from aqueous solutions. With multiple extraction under non-equilibrium conditions considerably less time is required in order to obtain an extraction yield that is equal to that of one extraction at equilibrium. On
Koster, EHM, de Jong, GJ
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