Journal ArticleDOI
Mass Transfer Characteristics of Solvent Extraction into a Single Drop at the Tip of a Syringe Needle
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TLDR
In this article, the authors measured the amount of a sample compound extracted into a 1-μL drop of n-octane suspended in a stirred aqueous solution from the tip of a microsyringe needle.Abstract:
The amount of a sample compound extracted into a 1-μL drop of n-octane suspended in a stirred aqueous solution from the tip of a microsyringe needle is measured by gas chromatography (GC) as a function of time. The observed extraction rate curve is first order and yields the overall mass transfer coefficient for the sample compound, βo. For a given compound, βo varies linearly with stirring rate. Among the four compounds malathion, 4-methylacetophenone, 4-nitrotoluene, and progesterone, at a given stirring rate, βo is linearly proportional to the diffusion coefficient of the compound (Daq). This supports the film theory of convective−diffusive mass transfer, as opposed to the penetration theory. The relative standard deviation of the GC signal for 4-methylacetophenone after a 1.00 min extraction at 1500 rpm is 1.5%, which suggests that the system exhibits excellent potential as a tool for rapid analysis by solvent extraction/GC.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
Evolution of dispersive liquid-liquid microextraction method.
TL;DR: This review focuses on the extra steps in sample preparation for application of DLLME in different matrixes such as food, biological fluids and solid samples and its applications in conjunction with different extraction techniques such as solid-phase extraction, solidification of floating organic drop and supercritical fluid extraction are summarized.
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
Developments in hollow fibre-based, liquid-phase microextraction
TL;DR: A recent review as discussed by the authors focuses on basic extraction principles, technical set-up, recovery, enrichment, extraction speed, selectivity, applications, and future trends in hollow fibre-based liquid-phase microextraction.
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.
Journal ArticleDOI
Solvent microextraction into a single drop.
TL;DR: An analytical technique is described which combines solvent extraction with gas chromatographic (GC) analysis in a simple and inexpensive apparatus involving very little solvent consumption and is in good agreement with a convective-diffusive kinetic model.
Journal ArticleDOI
Air-Water Contact Operations in a Packed Column
Fumitake Yoshida,Tatsuo Tanaka +1 more
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