Journal ArticleDOI
Liquid-Phase Microextraction in a Single Drop of Organic Solvent by Using a Conventional Microsyringe
Y. He and,Hian Kee Lee +1 more
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In this article, two modes of liquid-phase microextraction (LPME) were developed for capillary gas chromatography, i.e., static and dynamic LPME, which involve the use of very small amounts of organic solvent in a conventional microsyringe.Abstract:
Two modes of liquid-phase microextraction (LPME) were developed for capillary gas chromatography. Both methodologies, i.e., static LPME and dynamic LPME, involve the use of very small amounts of organic solvent (<2 μL) in a conventional microsyringe. The performance of the two techniques is demonstrated in the determination of two chlorobenzenes extracted into a single drop of toluene by the use of a 10-μL syringe. Static LPME provided some enrichment (∼12-fold), good reproducibility (9.7%), and simplicity but suffered relatively long extraction time (15 min). Dynamic LPME provided higher (∼27-fold) enrichment within much shorter extraction time (∼3 min), and relatively poorer precision (12.8%), primarily due to repeated manual manipulation. Both methods allow the direct transfer of extracted analytes into a gas chromatograph.read more
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Journal ArticleDOI
Determination of organic compounds in water using dispersive liquid-liquid microextraction
Mohammad Rezaee,Yaghoub Assadi,Mohammad Reza Milani Hosseini,Elham Aghaee,Fardin Ahmadi,Sana Berijani +5 more
TL;DR: The ability of DLLME technique in the extraction of other organic compounds such as organochlorine pesticides, organophosphorus pesticides and substituted benzene compounds were studied.
Journal ArticleDOI
Dispersive liquid-liquid microextraction combined with gas chromatography-flame photometric detection. Very simple, rapid and sensitive method for the determination of organophosphorus pesticides in water
TL;DR: Under the optimum conditions, the enrichment factors and extraction recoveries were high and ranged between 789-1070 and 78.9-107%, respectively, while the linear range was wide and limit of detections were very low and were between 3 to 20 pg/mL for most of the analytes.
Journal ArticleDOI
Liquid-phase microextraction
TL;DR: In this paper, the authors discuss liquid-phase microextraction with the focus on extraction principles, historical development and performance, and discuss the current trend towards simplification and miniaturization of sample preparation and decreasing the quantities of organic solvents used.
Journal ArticleDOI
Developments in liquid-phase microextraction
TL;DR: The liquid-phase microextraction (LPME) as mentioned in this paper is a sample-preparation technique that uses a hollow fiber impregnated with an organic solvent to accommodate or protect microvolumes of acceptor solution.
Journal ArticleDOI
Ultrasound-assisted emulsification–microextraction of emergent contaminants and pesticides in environmental waters
TL;DR: USAEME is proposed as an efficient, fast, simple and non-expensive alternative to other extraction techniques such as SPE, SPME and LPME for the analysis of environmental waters including bottled, tap, river, municipal swimming pool, sewage and seaport water samples.
References
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Book
Diffusion: Mass Transfer in Fluid Systems
TL;DR: An overview of diffusion and separation processes brings unsurpassed, engaging clarity to this complex topic as mentioned in this paper, which is a key part of the undergraduate chemical engineering curriculum and at the core of understanding chemical purification and reaction engineering.
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Solid phase microextraction with thermal desorption using fused silica optical fibers
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Rapid determination of polyaromatic hydrocarbons and polychlorinated biphenyls in water using solid-phase microextraction and GC/MS.
David W. Potter,Janusz Pawliszyn +1 more
TL;DR: Solid-phase microextraction was investigated as a solvent-free alternative method for the extraction and analysis of nonpolar semivolatile analytes and eliminates the loss of analytes through adsorption onto container walls and saves transport costs.
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Membrane approach to solid-phase extractions
TL;DR: In this paper, a novel material for separations has been developed in which efficient chromatographic particles are enmeshed in a network of PTFE fibrils to form a strong, porous sheet or "membrane".
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Extraction based on the flow-injection principle : Part I. Description of the Extraction System
Bo Karlberg,Sidsel Thelander +1 more
TL;DR: In this paper, an extraction system consisting of a pump, a rotary valve and a spectrophotometer is used to extract 12-25 µl of caffeine from a sample.